4083 lines
124 KiB
Go
4083 lines
124 KiB
Go
package agent
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import (
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"context"
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"crypto/sha512"
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"crypto/tls"
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"encoding/json"
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"fmt"
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"io"
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"io/ioutil"
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"log"
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"net"
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"net/http"
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"os"
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"path/filepath"
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"regexp"
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"strconv"
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"strings"
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"sync"
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"time"
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"github.com/hashicorp/go-memdb"
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"google.golang.org/grpc"
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"github.com/armon/go-metrics"
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"github.com/hashicorp/consul/acl"
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"github.com/hashicorp/consul/agent/ae"
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"github.com/hashicorp/consul/agent/cache"
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cachetype "github.com/hashicorp/consul/agent/cache-types"
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"github.com/hashicorp/consul/agent/checks"
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"github.com/hashicorp/consul/agent/config"
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"github.com/hashicorp/consul/agent/consul"
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"github.com/hashicorp/consul/agent/local"
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"github.com/hashicorp/consul/agent/proxycfg"
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"github.com/hashicorp/consul/agent/structs"
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"github.com/hashicorp/consul/agent/systemd"
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"github.com/hashicorp/consul/agent/token"
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"github.com/hashicorp/consul/agent/xds"
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"github.com/hashicorp/consul/api"
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"github.com/hashicorp/consul/api/watch"
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"github.com/hashicorp/consul/ipaddr"
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"github.com/hashicorp/consul/lib"
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"github.com/hashicorp/consul/lib/file"
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"github.com/hashicorp/consul/logger"
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"github.com/hashicorp/consul/tlsutil"
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"github.com/hashicorp/consul/types"
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"github.com/hashicorp/go-multierror"
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"github.com/hashicorp/go-uuid"
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"github.com/hashicorp/memberlist"
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"github.com/hashicorp/raft"
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"github.com/hashicorp/serf/serf"
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"github.com/shirou/gopsutil/host"
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"golang.org/x/net/http2"
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)
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const (
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// Path to save agent service definitions
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servicesDir = "services"
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serviceConfigDir = "services/configs"
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// Path to save agent proxy definitions
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proxyDir = "proxies"
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// Path to save local agent checks
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checksDir = "checks"
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checkStateDir = "checks/state"
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// Name of the file tokens will be persisted within
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tokensPath = "acl-tokens.json"
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// Default reasons for node/service maintenance mode
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defaultNodeMaintReason = "Maintenance mode is enabled for this node, " +
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"but no reason was provided. This is a default message."
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defaultServiceMaintReason = "Maintenance mode is enabled for this " +
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"service, but no reason was provided. This is a default message."
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// ID of the roots watch
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rootsWatchID = "roots"
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// ID of the leaf watch
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leafWatchID = "leaf"
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// maxQueryTime is used to bound the limit of a blocking query
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maxQueryTime = 600 * time.Second
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// defaultQueryTime is the amount of time we block waiting for a change
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// if no time is specified. Previously we would wait the maxQueryTime.
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defaultQueryTime = 300 * time.Second
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)
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var (
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httpAddrRE = regexp.MustCompile(`^(http[s]?://)(\[.*?\]|\[?[\w\-\.]+)(:\d+)?([^?]*)(\?.*)?$`)
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grpcAddrRE = regexp.MustCompile("(.*)((?::)(?:[0-9]+))(.*)$")
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)
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type configSource int
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const (
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ConfigSourceLocal configSource = iota
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ConfigSourceRemote
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)
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var configSourceToName = map[configSource]string{
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ConfigSourceLocal: "local",
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ConfigSourceRemote: "remote",
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}
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var configSourceFromName = map[string]configSource{
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"local": ConfigSourceLocal,
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"remote": ConfigSourceRemote,
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// If the value is not found in the persisted config file, then use the
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// former default.
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"": ConfigSourceLocal,
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}
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func (s configSource) String() string {
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return configSourceToName[s]
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}
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// ConfigSourceFromName will unmarshal the string form of a configSource.
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func ConfigSourceFromName(name string) (configSource, bool) {
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s, ok := configSourceFromName[name]
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return s, ok
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}
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// delegate defines the interface shared by both
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// consul.Client and consul.Server.
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type delegate interface {
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Encrypted() bool
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GetLANCoordinate() (lib.CoordinateSet, error)
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Leave() error
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LANMembers() []serf.Member
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LANMembersAllSegments() ([]serf.Member, error)
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LANSegmentMembers(segment string) ([]serf.Member, error)
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LocalMember() serf.Member
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JoinLAN(addrs []string) (n int, err error)
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RemoveFailedNode(node string, prune bool) error
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ResolveToken(secretID string) (acl.Authorizer, error)
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RPC(method string, args interface{}, reply interface{}) error
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ACLsEnabled() bool
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UseLegacyACLs() bool
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SnapshotRPC(args *structs.SnapshotRequest, in io.Reader, out io.Writer, replyFn structs.SnapshotReplyFn) error
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Shutdown() error
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Stats() map[string]map[string]string
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ReloadConfig(config *consul.Config) error
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enterpriseDelegate
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}
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// notifier is called after a successful JoinLAN.
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type notifier interface {
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Notify(string) error
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}
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// The agent is the long running process that is run on every machine.
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// It exposes an RPC interface that is used by the CLI to control the
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// agent. The agent runs the query interfaces like HTTP, DNS, and RPC.
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// However, it can run in either a client, or server mode. In server
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// mode, it runs a full Consul server. In client-only mode, it only forwards
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// requests to other Consul servers.
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type Agent struct {
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// config is the agent configuration.
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config *config.RuntimeConfig
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// Used for writing our logs
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logger *log.Logger
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// Output sink for logs
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LogOutput io.Writer
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// Used for streaming logs to
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LogWriter *logger.LogWriter
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// In-memory sink used for collecting metrics
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MemSink *metrics.InmemSink
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// delegate is either a *consul.Server or *consul.Client
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// depending on the configuration
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delegate delegate
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// aclMasterAuthorizer is an object that helps manage local ACL enforcement.
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aclMasterAuthorizer acl.Authorizer
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// state stores a local representation of the node,
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// services and checks. Used for anti-entropy.
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State *local.State
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// sync manages the synchronization of the local
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// and the remote state.
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sync *ae.StateSyncer
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// syncMu and syncCh are used to coordinate agent endpoints that are blocking
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// on local state during a config reload.
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syncMu sync.Mutex
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syncCh chan struct{}
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// cache is the in-memory cache for data the Agent requests.
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cache *cache.Cache
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// checkReapAfter maps the check ID to a timeout after which we should
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// reap its associated service
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checkReapAfter map[types.CheckID]time.Duration
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// checkMonitors maps the check ID to an associated monitor
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checkMonitors map[types.CheckID]*checks.CheckMonitor
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// checkHTTPs maps the check ID to an associated HTTP check
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checkHTTPs map[types.CheckID]*checks.CheckHTTP
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// checkTCPs maps the check ID to an associated TCP check
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checkTCPs map[types.CheckID]*checks.CheckTCP
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// checkGRPCs maps the check ID to an associated GRPC check
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checkGRPCs map[types.CheckID]*checks.CheckGRPC
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// checkTTLs maps the check ID to an associated check TTL
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checkTTLs map[types.CheckID]*checks.CheckTTL
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// checkDockers maps the check ID to an associated Docker Exec based check
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checkDockers map[types.CheckID]*checks.CheckDocker
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// checkAliases maps the check ID to an associated Alias checks
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checkAliases map[types.CheckID]*checks.CheckAlias
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// exposedPorts tracks listener ports for checks exposed through a proxy
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exposedPorts map[string]int
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// stateLock protects the agent state
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stateLock sync.Mutex
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// dockerClient is the client for performing docker health checks.
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dockerClient *checks.DockerClient
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// eventCh is used to receive user events
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eventCh chan serf.UserEvent
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// eventBuf stores the most recent events in a ring buffer
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// using eventIndex as the next index to insert into. This
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// is guarded by eventLock. When an insert happens, the
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// eventNotify group is notified.
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eventBuf []*UserEvent
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eventIndex int
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eventLock sync.RWMutex
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eventNotify NotifyGroup
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reloadCh chan chan error
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shutdown bool
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shutdownCh chan struct{}
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shutdownLock sync.Mutex
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InterruptStartCh chan struct{}
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// joinLANNotifier is called after a successful JoinLAN.
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joinLANNotifier notifier
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// retryJoinCh transports errors from the retry join
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// attempts.
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retryJoinCh chan error
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// endpoints maps unique RPC endpoint names to common ones
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// to allow overriding of RPC handlers since the golang
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// net/rpc server does not allow this.
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endpoints map[string]string
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endpointsLock sync.RWMutex
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// dnsServer provides the DNS API
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dnsServers []*DNSServer
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// httpServers provides the HTTP API on various endpoints
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httpServers []*HTTPServer
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// wgServers is the wait group for all HTTP and DNS servers
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wgServers sync.WaitGroup
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// watchPlans tracks all the currently-running watch plans for the
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// agent.
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watchPlans []*watch.Plan
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// tokens holds ACL tokens initially from the configuration, but can
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// be updated at runtime, so should always be used instead of going to
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// the configuration directly.
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tokens *token.Store
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// proxyConfig is the manager for proxy service (Kind = connect-proxy)
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// configuration state. This ensures all state needed by a proxy registration
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// is maintained in cache and handles pushing updates to that state into XDS
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// server to be pushed out to Envoy.
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proxyConfig *proxycfg.Manager
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// serviceManager is the manager for combining local service registrations with
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// the centrally configured proxy/service defaults.
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serviceManager *ServiceManager
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// xdsServer is the Server instance that serves xDS gRPC API.
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xdsServer *xds.Server
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// grpcServer is the server instance used currently to serve xDS API for
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// Envoy.
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grpcServer *grpc.Server
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// tlsConfigurator is the central instance to provide a *tls.Config
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// based on the current consul configuration.
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tlsConfigurator *tlsutil.Configurator
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// persistedTokensLock is used to synchronize access to the persisted token
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// store within the data directory. This will prevent loading while writing as
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// well as multiple concurrent writes.
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persistedTokensLock sync.RWMutex
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}
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func New(c *config.RuntimeConfig, logger *log.Logger) (*Agent, error) {
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if c.Datacenter == "" {
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return nil, fmt.Errorf("Must configure a Datacenter")
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}
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if c.DataDir == "" && !c.DevMode {
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return nil, fmt.Errorf("Must configure a DataDir")
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}
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a := Agent{
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config: c,
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checkReapAfter: make(map[types.CheckID]time.Duration),
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checkMonitors: make(map[types.CheckID]*checks.CheckMonitor),
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checkTTLs: make(map[types.CheckID]*checks.CheckTTL),
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checkHTTPs: make(map[types.CheckID]*checks.CheckHTTP),
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checkTCPs: make(map[types.CheckID]*checks.CheckTCP),
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checkGRPCs: make(map[types.CheckID]*checks.CheckGRPC),
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checkDockers: make(map[types.CheckID]*checks.CheckDocker),
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checkAliases: make(map[types.CheckID]*checks.CheckAlias),
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eventCh: make(chan serf.UserEvent, 1024),
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eventBuf: make([]*UserEvent, 256),
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joinLANNotifier: &systemd.Notifier{},
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reloadCh: make(chan chan error),
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retryJoinCh: make(chan error),
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shutdownCh: make(chan struct{}),
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InterruptStartCh: make(chan struct{}),
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endpoints: make(map[string]string),
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tokens: new(token.Store),
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logger: logger,
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}
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a.serviceManager = NewServiceManager(&a)
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if err := a.initializeACLs(); err != nil {
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return nil, err
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}
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// Retrieve or generate the node ID before setting up the rest of the
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// agent, which depends on it.
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if err := a.setupNodeID(c); err != nil {
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return nil, fmt.Errorf("Failed to setup node ID: %v", err)
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}
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return &a, nil
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}
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func LocalConfig(cfg *config.RuntimeConfig) local.Config {
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lc := local.Config{
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AdvertiseAddr: cfg.AdvertiseAddrLAN.String(),
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CheckUpdateInterval: cfg.CheckUpdateInterval,
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Datacenter: cfg.Datacenter,
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DiscardCheckOutput: cfg.DiscardCheckOutput,
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NodeID: cfg.NodeID,
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NodeName: cfg.NodeName,
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TaggedAddresses: map[string]string{},
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}
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for k, v := range cfg.TaggedAddresses {
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lc.TaggedAddresses[k] = v
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}
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return lc
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}
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func (a *Agent) Start() error {
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a.stateLock.Lock()
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defer a.stateLock.Unlock()
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c := a.config
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// Warn if the node name is incompatible with DNS
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if InvalidDnsRe.MatchString(a.config.NodeName) {
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a.logger.Printf("[WARN] agent: Node name %q will not be discoverable "+
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"via DNS due to invalid characters. Valid characters include "+
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"all alpha-numerics and dashes.", a.config.NodeName)
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} else if len(a.config.NodeName) > MaxDNSLabelLength {
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a.logger.Printf("[WARN] agent: Node name %q will not be discoverable "+
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"via DNS due to it being too long. Valid lengths are between "+
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"1 and 63 bytes.", a.config.NodeName)
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}
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// load the tokens - this requires the logger to be setup
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// which is why we can't do this in New
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a.loadTokens(a.config)
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|
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// create the local state
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a.State = local.NewState(LocalConfig(c), a.logger, a.tokens)
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|
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// create the state synchronization manager which performs
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// regular and on-demand state synchronizations (anti-entropy).
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a.sync = ae.NewStateSyncer(a.State, c.AEInterval, a.shutdownCh, a.logger)
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|
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// create the cache
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a.cache = cache.New(nil)
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|
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// create the config for the rpc server/client
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consulCfg, err := a.consulConfig()
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if err != nil {
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return err
|
|
}
|
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|
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// ServerUp is used to inform that a new consul server is now
|
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// up. This can be used to speed up the sync process if we are blocking
|
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// waiting to discover a consul server
|
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consulCfg.ServerUp = a.sync.SyncFull.Trigger
|
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|
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tlsConfigurator, err := tlsutil.NewConfigurator(c.ToTLSUtilConfig(), a.logger)
|
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if err != nil {
|
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return err
|
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}
|
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a.tlsConfigurator = tlsConfigurator
|
|
|
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// Setup either the client or the server.
|
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if c.ServerMode {
|
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server, err := consul.NewServerLogger(consulCfg, a.logger, a.tokens, a.tlsConfigurator)
|
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if err != nil {
|
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return fmt.Errorf("Failed to start Consul server: %v", err)
|
|
}
|
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a.delegate = server
|
|
} else {
|
|
client, err := consul.NewClientLogger(consulCfg, a.logger, a.tlsConfigurator)
|
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if err != nil {
|
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return fmt.Errorf("Failed to start Consul client: %v", err)
|
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}
|
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a.delegate = client
|
|
}
|
|
|
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// the staggering of the state syncing depends on the cluster size.
|
|
a.sync.ClusterSize = func() int { return len(a.delegate.LANMembers()) }
|
|
|
|
// link the state with the consul server/client and the state syncer
|
|
// via callbacks. After several attempts this was easier than using
|
|
// channels since the event notification needs to be non-blocking
|
|
// and that should be hidden in the state syncer implementation.
|
|
a.State.Delegate = a.delegate
|
|
a.State.TriggerSyncChanges = a.sync.SyncChanges.Trigger
|
|
|
|
// Register the cache. We do this much later so the delegate is
|
|
// populated from above.
|
|
a.registerCache()
|
|
|
|
if a.config.AutoEncryptTLS && !a.config.ServerMode {
|
|
reply, err := a.setupClientAutoEncrypt()
|
|
if err != nil {
|
|
return fmt.Errorf("AutoEncrypt failed: %s", err)
|
|
}
|
|
rootsReq, leafReq, err := a.setupClientAutoEncryptCache(reply)
|
|
if err != nil {
|
|
return fmt.Errorf("AutoEncrypt failed: %s", err)
|
|
}
|
|
if err = a.setupClientAutoEncryptWatching(rootsReq, leafReq); err != nil {
|
|
return fmt.Errorf("AutoEncrypt failed: %s", err)
|
|
}
|
|
a.logger.Printf("[INFO] AutoEncrypt: upgraded to TLS")
|
|
}
|
|
|
|
a.serviceManager.Start()
|
|
|
|
// Load checks/services/metadata.
|
|
if err := a.loadServices(c); err != nil {
|
|
return err
|
|
}
|
|
if err := a.loadChecks(c, nil); err != nil {
|
|
return err
|
|
}
|
|
if err := a.loadMetadata(c); err != nil {
|
|
return err
|
|
}
|
|
|
|
// Start the proxy config manager.
|
|
a.proxyConfig, err = proxycfg.NewManager(proxycfg.ManagerConfig{
|
|
Cache: a.cache,
|
|
Logger: a.logger,
|
|
State: a.State,
|
|
Source: &structs.QuerySource{
|
|
Node: a.config.NodeName,
|
|
Datacenter: a.config.Datacenter,
|
|
Segment: a.config.SegmentName,
|
|
},
|
|
})
|
|
if err != nil {
|
|
return err
|
|
}
|
|
go func() {
|
|
if err := a.proxyConfig.Run(); err != nil {
|
|
a.logger.Printf("[ERR] Proxy Config Manager exited: %s", err)
|
|
}
|
|
}()
|
|
|
|
// Start watching for critical services to deregister, based on their
|
|
// checks.
|
|
go a.reapServices()
|
|
|
|
// Start handling events.
|
|
go a.handleEvents()
|
|
|
|
// Start sending network coordinate to the server.
|
|
if !c.DisableCoordinates {
|
|
go a.sendCoordinate()
|
|
}
|
|
|
|
// Write out the PID file if necessary.
|
|
if err := a.storePid(); err != nil {
|
|
return err
|
|
}
|
|
|
|
// start DNS servers
|
|
if err := a.listenAndServeDNS(); err != nil {
|
|
return err
|
|
}
|
|
|
|
// Create listeners and unstarted servers; see comment on listenHTTP why
|
|
// we are doing this.
|
|
servers, err := a.listenHTTP()
|
|
if err != nil {
|
|
return err
|
|
}
|
|
|
|
// Start HTTP and HTTPS servers.
|
|
for _, srv := range servers {
|
|
if err := a.serveHTTP(srv); err != nil {
|
|
return err
|
|
}
|
|
a.httpServers = append(a.httpServers, srv)
|
|
}
|
|
|
|
// Start gRPC server.
|
|
if err := a.listenAndServeGRPC(); err != nil {
|
|
return err
|
|
}
|
|
|
|
// register watches
|
|
if err := a.reloadWatches(a.config); err != nil {
|
|
return err
|
|
}
|
|
|
|
// start retry join
|
|
go a.retryJoinLAN()
|
|
go a.retryJoinWAN()
|
|
|
|
return nil
|
|
}
|
|
|
|
func (a *Agent) setupClientAutoEncrypt() (*structs.SignedResponse, error) {
|
|
client := a.delegate.(*consul.Client)
|
|
|
|
addrs := a.config.StartJoinAddrsLAN
|
|
disco, err := newDiscover()
|
|
if err != nil && len(addrs) == 0 {
|
|
return nil, err
|
|
}
|
|
addrs = append(addrs, retryJoinAddrs(disco, "LAN", a.config.RetryJoinLAN, a.logger)...)
|
|
|
|
reply, priv, err := client.RequestAutoEncryptCerts(addrs, a.config.ServerPort, a.tokens.AgentToken(), a.InterruptStartCh)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
|
|
connectCAPems := []string{}
|
|
for _, ca := range reply.ConnectCARoots.Roots {
|
|
connectCAPems = append(connectCAPems, ca.RootCert)
|
|
}
|
|
if err := a.tlsConfigurator.UpdateAutoEncrypt(reply.ManualCARoots, connectCAPems, reply.IssuedCert.CertPEM, priv, reply.VerifyServerHostname); err != nil {
|
|
return nil, err
|
|
}
|
|
return reply, nil
|
|
|
|
}
|
|
|
|
func (a *Agent) setupClientAutoEncryptCache(reply *structs.SignedResponse) (*structs.DCSpecificRequest, *cachetype.ConnectCALeafRequest, error) {
|
|
rootsReq := &structs.DCSpecificRequest{
|
|
Datacenter: a.config.Datacenter,
|
|
QueryOptions: structs.QueryOptions{Token: a.tokens.AgentToken()},
|
|
}
|
|
|
|
// prepolutate roots cache
|
|
rootRes := cache.FetchResult{Value: &reply.ConnectCARoots, Index: reply.ConnectCARoots.QueryMeta.Index}
|
|
if err := a.cache.Prepopulate(cachetype.ConnectCARootName, rootRes, a.config.Datacenter, a.tokens.AgentToken(), rootsReq.CacheInfo().Key); err != nil {
|
|
return nil, nil, err
|
|
}
|
|
|
|
leafReq := &cachetype.ConnectCALeafRequest{
|
|
Datacenter: a.config.Datacenter,
|
|
Token: a.tokens.AgentToken(),
|
|
Agent: a.config.NodeName,
|
|
}
|
|
|
|
// prepolutate leaf cache
|
|
certRes := cache.FetchResult{Value: &reply.IssuedCert, Index: reply.ConnectCARoots.QueryMeta.Index}
|
|
if err := a.cache.Prepopulate(cachetype.ConnectCALeafName, certRes, a.config.Datacenter, a.tokens.AgentToken(), leafReq.Key()); err != nil {
|
|
return nil, nil, err
|
|
}
|
|
return rootsReq, leafReq, nil
|
|
}
|
|
|
|
func (a *Agent) setupClientAutoEncryptWatching(rootsReq *structs.DCSpecificRequest, leafReq *cachetype.ConnectCALeafRequest) error {
|
|
// setup watches
|
|
ch := make(chan cache.UpdateEvent, 10)
|
|
ctx, cancel := context.WithCancel(context.Background())
|
|
|
|
// Watch for root changes
|
|
err := a.cache.Notify(ctx, cachetype.ConnectCARootName, rootsReq, rootsWatchID, ch)
|
|
if err != nil {
|
|
cancel()
|
|
return err
|
|
}
|
|
|
|
// Watch the leaf cert
|
|
err = a.cache.Notify(ctx, cachetype.ConnectCALeafName, leafReq, leafWatchID, ch)
|
|
if err != nil {
|
|
cancel()
|
|
return err
|
|
}
|
|
|
|
// Setup actions in case the watches are firing.
|
|
go func() {
|
|
for {
|
|
select {
|
|
case <-a.shutdownCh:
|
|
cancel()
|
|
return
|
|
case <-ctx.Done():
|
|
return
|
|
case u := <-ch:
|
|
switch u.CorrelationID {
|
|
case rootsWatchID:
|
|
roots, ok := u.Result.(*structs.IndexedCARoots)
|
|
if !ok {
|
|
err := fmt.Errorf("invalid type for roots response: %T", u.Result)
|
|
a.logger.Printf("[ERR] %s watch error: %s", u.CorrelationID, err)
|
|
continue
|
|
}
|
|
pems := []string{}
|
|
for _, root := range roots.Roots {
|
|
pems = append(pems, root.RootCert)
|
|
}
|
|
a.tlsConfigurator.UpdateAutoEncryptCA(pems)
|
|
case leafWatchID:
|
|
leaf, ok := u.Result.(*structs.IssuedCert)
|
|
if !ok {
|
|
err := fmt.Errorf("invalid type for leaf response: %T", u.Result)
|
|
a.logger.Printf("[ERR] %s watch error: %s", u.CorrelationID, err)
|
|
continue
|
|
}
|
|
a.tlsConfigurator.UpdateAutoEncryptCert(leaf.CertPEM, leaf.PrivateKeyPEM)
|
|
}
|
|
}
|
|
}
|
|
}()
|
|
|
|
// Setup safety net in case the auto_encrypt cert doesn't get renewed
|
|
// in time. The agent would be stuck in that case because the watches
|
|
// never use the AutoEncrypt.Sign endpoint.
|
|
go func() {
|
|
for {
|
|
|
|
// Check 10sec after cert expires. The agent cache
|
|
// should be handling the expiration and renew before
|
|
// it.
|
|
// If there is no cert, AutoEncryptCertNotAfter returns
|
|
// a value in the past which immediately triggers the
|
|
// renew, but this case shouldn't happen because at
|
|
// this point, auto_encrypt was just being setup
|
|
// successfully.
|
|
interval := a.tlsConfigurator.AutoEncryptCertNotAfter().Sub(time.Now().Add(10 * time.Second))
|
|
a.logger.Printf("[DEBUG] AutoEncrypt: client certificate expiration check in %s", interval)
|
|
select {
|
|
case <-a.shutdownCh:
|
|
return
|
|
case <-time.After(interval):
|
|
// check auto encrypt client cert expiration
|
|
if a.tlsConfigurator.AutoEncryptCertExpired() {
|
|
a.logger.Printf("[DEBUG] AutoEncrypt: client certificate expired.")
|
|
reply, err := a.setupClientAutoEncrypt()
|
|
if err != nil {
|
|
a.logger.Printf("[ERR] AutoEncrypt: client certificate expired, failed to renew: %s", err)
|
|
// in case of an error, try again in one minute
|
|
interval = time.Minute
|
|
continue
|
|
}
|
|
_, _, err = a.setupClientAutoEncryptCache(reply)
|
|
if err != nil {
|
|
a.logger.Printf("[ERR] AutoEncrypt: client certificate expired, failed to populate cache: %s", err)
|
|
// in case of an error, try again in one minute
|
|
interval = time.Minute
|
|
continue
|
|
}
|
|
}
|
|
}
|
|
}
|
|
}()
|
|
|
|
return nil
|
|
}
|
|
|
|
func (a *Agent) listenAndServeGRPC() error {
|
|
if len(a.config.GRPCAddrs) < 1 {
|
|
return nil
|
|
}
|
|
|
|
a.xdsServer = &xds.Server{
|
|
Logger: a.logger,
|
|
CfgMgr: a.proxyConfig,
|
|
Authz: a,
|
|
ResolveToken: a.resolveToken,
|
|
CheckFetcher: a,
|
|
CfgFetcher: a,
|
|
}
|
|
a.xdsServer.Initialize()
|
|
|
|
var err error
|
|
if a.config.HTTPSPort > 0 {
|
|
// gRPC uses the same TLS settings as the HTTPS API. If HTTPS is
|
|
// enabled then gRPC will require HTTPS as well.
|
|
a.grpcServer, err = a.xdsServer.GRPCServer(a.config.CertFile, a.config.KeyFile)
|
|
} else {
|
|
a.grpcServer, err = a.xdsServer.GRPCServer("", "")
|
|
}
|
|
if err != nil {
|
|
return err
|
|
}
|
|
|
|
ln, err := a.startListeners(a.config.GRPCAddrs)
|
|
if err != nil {
|
|
return err
|
|
}
|
|
|
|
for _, l := range ln {
|
|
go func(innerL net.Listener) {
|
|
a.logger.Printf("[INFO] agent: Started gRPC server on %s (%s)",
|
|
innerL.Addr().String(), innerL.Addr().Network())
|
|
err := a.grpcServer.Serve(innerL)
|
|
if err != nil {
|
|
a.logger.Printf("[ERR] gRPC server failed: %s", err)
|
|
}
|
|
}(l)
|
|
}
|
|
return nil
|
|
}
|
|
|
|
func (a *Agent) listenAndServeDNS() error {
|
|
notif := make(chan net.Addr, len(a.config.DNSAddrs))
|
|
errCh := make(chan error, len(a.config.DNSAddrs))
|
|
for _, addr := range a.config.DNSAddrs {
|
|
// create server
|
|
s, err := NewDNSServer(a)
|
|
if err != nil {
|
|
return err
|
|
}
|
|
a.dnsServers = append(a.dnsServers, s)
|
|
|
|
// start server
|
|
a.wgServers.Add(1)
|
|
go func(addr net.Addr) {
|
|
defer a.wgServers.Done()
|
|
err := s.ListenAndServe(addr.Network(), addr.String(), func() { notif <- addr })
|
|
if err != nil && !strings.Contains(err.Error(), "accept") {
|
|
errCh <- err
|
|
}
|
|
}(addr)
|
|
}
|
|
|
|
// wait for servers to be up
|
|
timeout := time.After(time.Second)
|
|
var merr *multierror.Error
|
|
for range a.config.DNSAddrs {
|
|
select {
|
|
case addr := <-notif:
|
|
a.logger.Printf("[INFO] agent: Started DNS server %s (%s)", addr.String(), addr.Network())
|
|
|
|
case err := <-errCh:
|
|
merr = multierror.Append(merr, err)
|
|
case <-timeout:
|
|
merr = multierror.Append(merr, fmt.Errorf("agent: timeout starting DNS servers"))
|
|
break
|
|
}
|
|
}
|
|
return merr.ErrorOrNil()
|
|
}
|
|
|
|
func (a *Agent) startListeners(addrs []net.Addr) ([]net.Listener, error) {
|
|
var ln []net.Listener
|
|
for _, addr := range addrs {
|
|
var l net.Listener
|
|
var err error
|
|
|
|
switch x := addr.(type) {
|
|
case *net.UnixAddr:
|
|
l, err = a.listenSocket(x.Name)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
|
|
case *net.TCPAddr:
|
|
l, err = net.Listen("tcp", x.String())
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
l = &tcpKeepAliveListener{l.(*net.TCPListener)}
|
|
|
|
default:
|
|
return nil, fmt.Errorf("unsupported address type %T", addr)
|
|
}
|
|
ln = append(ln, l)
|
|
}
|
|
return ln, nil
|
|
}
|
|
|
|
// listenHTTP binds listeners to the provided addresses and also returns
|
|
// pre-configured HTTP servers which are not yet started. The motivation is
|
|
// that in the current startup/shutdown setup we de-couple the listener
|
|
// creation from the server startup assuming that if any of the listeners
|
|
// cannot be bound we fail immediately and later failures do not occur.
|
|
// Therefore, starting a server with a running listener is assumed to not
|
|
// produce an error.
|
|
//
|
|
// The second motivation is that an HTTPS server needs to use the same TLSConfig
|
|
// on both the listener and the HTTP server. When listeners and servers are
|
|
// created at different times this becomes difficult to handle without keeping
|
|
// the TLS configuration somewhere or recreating it.
|
|
//
|
|
// This approach should ultimately be refactored to the point where we just
|
|
// start the server and any error should trigger a proper shutdown of the agent.
|
|
func (a *Agent) listenHTTP() ([]*HTTPServer, error) {
|
|
var ln []net.Listener
|
|
var servers []*HTTPServer
|
|
start := func(proto string, addrs []net.Addr) error {
|
|
listeners, err := a.startListeners(addrs)
|
|
if err != nil {
|
|
return err
|
|
}
|
|
|
|
for _, l := range listeners {
|
|
var tlscfg *tls.Config
|
|
_, isTCP := l.(*tcpKeepAliveListener)
|
|
if isTCP && proto == "https" {
|
|
tlscfg = a.tlsConfigurator.IncomingHTTPSConfig()
|
|
l = tls.NewListener(l, tlscfg)
|
|
}
|
|
srv := &HTTPServer{
|
|
Server: &http.Server{
|
|
Addr: l.Addr().String(),
|
|
TLSConfig: tlscfg,
|
|
},
|
|
ln: l,
|
|
agent: a,
|
|
blacklist: NewBlacklist(a.config.HTTPBlockEndpoints),
|
|
proto: proto,
|
|
}
|
|
srv.Server.Handler = srv.handler(a.config.EnableDebug)
|
|
|
|
// This will enable upgrading connections to HTTP/2 as
|
|
// part of TLS negotiation.
|
|
if proto == "https" {
|
|
err = http2.ConfigureServer(srv.Server, nil)
|
|
if err != nil {
|
|
return err
|
|
}
|
|
}
|
|
|
|
ln = append(ln, l)
|
|
servers = append(servers, srv)
|
|
}
|
|
return nil
|
|
}
|
|
|
|
if err := start("http", a.config.HTTPAddrs); err != nil {
|
|
for _, l := range ln {
|
|
l.Close()
|
|
}
|
|
return nil, err
|
|
}
|
|
if err := start("https", a.config.HTTPSAddrs); err != nil {
|
|
for _, l := range ln {
|
|
l.Close()
|
|
}
|
|
return nil, err
|
|
}
|
|
return servers, nil
|
|
}
|
|
|
|
// tcpKeepAliveListener sets TCP keep-alive timeouts on accepted
|
|
// connections. It's used so dead TCP connections eventually go away.
|
|
type tcpKeepAliveListener struct {
|
|
*net.TCPListener
|
|
}
|
|
|
|
func (ln tcpKeepAliveListener) Accept() (c net.Conn, err error) {
|
|
tc, err := ln.AcceptTCP()
|
|
if err != nil {
|
|
return
|
|
}
|
|
tc.SetKeepAlive(true)
|
|
tc.SetKeepAlivePeriod(30 * time.Second)
|
|
return tc, nil
|
|
}
|
|
|
|
func (a *Agent) listenSocket(path string) (net.Listener, error) {
|
|
if _, err := os.Stat(path); !os.IsNotExist(err) {
|
|
a.logger.Printf("[WARN] agent: Replacing socket %q", path)
|
|
}
|
|
if err := os.Remove(path); err != nil && !os.IsNotExist(err) {
|
|
return nil, fmt.Errorf("error removing socket file: %s", err)
|
|
}
|
|
l, err := net.Listen("unix", path)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
user, group, mode := a.config.UnixSocketUser, a.config.UnixSocketGroup, a.config.UnixSocketMode
|
|
if err := setFilePermissions(path, user, group, mode); err != nil {
|
|
return nil, fmt.Errorf("Failed setting up socket: %s", err)
|
|
}
|
|
return l, nil
|
|
}
|
|
|
|
func (a *Agent) serveHTTP(srv *HTTPServer) error {
|
|
// https://github.com/golang/go/issues/20239
|
|
//
|
|
// In go.8.1 there is a race between Serve and Shutdown. If
|
|
// Shutdown is called before the Serve go routine was scheduled then
|
|
// the Serve go routine never returns. This deadlocks the agent
|
|
// shutdown for some tests since it will wait forever.
|
|
notif := make(chan net.Addr)
|
|
a.wgServers.Add(1)
|
|
go func() {
|
|
defer a.wgServers.Done()
|
|
notif <- srv.ln.Addr()
|
|
err := srv.Serve(srv.ln)
|
|
if err != nil && err != http.ErrServerClosed {
|
|
a.logger.Print(err)
|
|
}
|
|
}()
|
|
|
|
select {
|
|
case addr := <-notif:
|
|
if srv.proto == "https" {
|
|
a.logger.Printf("[INFO] agent: Started HTTPS server on %s (%s)", addr.String(), addr.Network())
|
|
} else {
|
|
a.logger.Printf("[INFO] agent: Started HTTP server on %s (%s)", addr.String(), addr.Network())
|
|
}
|
|
return nil
|
|
case <-time.After(time.Second):
|
|
return fmt.Errorf("agent: timeout starting HTTP servers")
|
|
}
|
|
}
|
|
|
|
// reloadWatches stops any existing watch plans and attempts to load the given
|
|
// set of watches.
|
|
func (a *Agent) reloadWatches(cfg *config.RuntimeConfig) error {
|
|
// Stop the current watches.
|
|
for _, wp := range a.watchPlans {
|
|
wp.Stop()
|
|
}
|
|
a.watchPlans = nil
|
|
|
|
// Return if there are no watches now.
|
|
if len(cfg.Watches) == 0 {
|
|
return nil
|
|
}
|
|
|
|
// Watches use the API to talk to this agent, so that must be enabled.
|
|
if len(cfg.HTTPAddrs) == 0 && len(cfg.HTTPSAddrs) == 0 {
|
|
return fmt.Errorf("watch plans require an HTTP or HTTPS endpoint")
|
|
}
|
|
|
|
// Compile the watches
|
|
var watchPlans []*watch.Plan
|
|
for _, params := range cfg.Watches {
|
|
if handlerType, ok := params["handler_type"]; !ok {
|
|
params["handler_type"] = "script"
|
|
} else if handlerType != "http" && handlerType != "script" {
|
|
return fmt.Errorf("Handler type '%s' not recognized", params["handler_type"])
|
|
}
|
|
|
|
// Don't let people use connect watches via this mechanism for now as it
|
|
// needs thought about how to do securely and shouldn't be necessary. Note
|
|
// that if the type assertion fails an type is not a string then
|
|
// ParseExample below will error so we don't need to handle that case.
|
|
if typ, ok := params["type"].(string); ok {
|
|
if strings.HasPrefix(typ, "connect_") {
|
|
return fmt.Errorf("Watch type %s is not allowed in agent config", typ)
|
|
}
|
|
}
|
|
|
|
// Parse the watches, excluding 'handler' and 'args'
|
|
wp, err := watch.ParseExempt(params, []string{"handler", "args"})
|
|
if err != nil {
|
|
return fmt.Errorf("Failed to parse watch (%#v): %v", params, err)
|
|
}
|
|
|
|
// Get the handler and subprocess arguments
|
|
handler, hasHandler := wp.Exempt["handler"]
|
|
args, hasArgs := wp.Exempt["args"]
|
|
if hasHandler {
|
|
a.logger.Printf("[WARN] agent: The 'handler' field in watches has been deprecated " +
|
|
"and replaced with the 'args' field. See https://www.consul.io/docs/agent/watches.html")
|
|
}
|
|
if _, ok := handler.(string); hasHandler && !ok {
|
|
return fmt.Errorf("Watch handler must be a string")
|
|
}
|
|
if raw, ok := args.([]interface{}); hasArgs && ok {
|
|
var parsed []string
|
|
for _, arg := range raw {
|
|
v, ok := arg.(string)
|
|
if !ok {
|
|
return fmt.Errorf("Watch args must be a list of strings")
|
|
}
|
|
|
|
parsed = append(parsed, v)
|
|
}
|
|
wp.Exempt["args"] = parsed
|
|
} else if hasArgs && !ok {
|
|
return fmt.Errorf("Watch args must be a list of strings")
|
|
}
|
|
if hasHandler && hasArgs || hasHandler && wp.HandlerType == "http" || hasArgs && wp.HandlerType == "http" {
|
|
return fmt.Errorf("Only one watch handler allowed")
|
|
}
|
|
if !hasHandler && !hasArgs && wp.HandlerType != "http" {
|
|
return fmt.Errorf("Must define a watch handler")
|
|
}
|
|
|
|
// Store the watch plan
|
|
watchPlans = append(watchPlans, wp)
|
|
}
|
|
|
|
// Fire off a goroutine for each new watch plan.
|
|
for _, wp := range watchPlans {
|
|
config, err := a.config.APIConfig(true)
|
|
if err != nil {
|
|
a.logger.Printf("[ERR] agent: Failed to run watch: %v", err)
|
|
continue
|
|
}
|
|
|
|
a.watchPlans = append(a.watchPlans, wp)
|
|
go func(wp *watch.Plan) {
|
|
if h, ok := wp.Exempt["handler"]; ok {
|
|
wp.Handler = makeWatchHandler(a.LogOutput, h)
|
|
} else if h, ok := wp.Exempt["args"]; ok {
|
|
wp.Handler = makeWatchHandler(a.LogOutput, h)
|
|
} else {
|
|
httpConfig := wp.Exempt["http_handler_config"].(*watch.HttpHandlerConfig)
|
|
wp.Handler = makeHTTPWatchHandler(a.LogOutput, httpConfig)
|
|
}
|
|
wp.LogOutput = a.LogOutput
|
|
|
|
addr := config.Address
|
|
if config.Scheme == "https" {
|
|
addr = "https://" + addr
|
|
}
|
|
|
|
if err := wp.RunWithConfig(addr, config); err != nil {
|
|
a.logger.Printf("[ERR] agent: Failed to run watch: %v", err)
|
|
}
|
|
}(wp)
|
|
}
|
|
return nil
|
|
}
|
|
|
|
// consulConfig is used to return a consul configuration
|
|
func (a *Agent) consulConfig() (*consul.Config, error) {
|
|
// Start with the provided config or default config
|
|
base := consul.DefaultConfig()
|
|
|
|
// This is set when the agent starts up
|
|
base.NodeID = a.config.NodeID
|
|
|
|
// Apply dev mode
|
|
base.DevMode = a.config.DevMode
|
|
|
|
// Override with our config
|
|
// todo(fs): these are now always set in the runtime config so we can simplify this
|
|
// todo(fs): or is there a reason to keep it like that?
|
|
base.Datacenter = a.config.Datacenter
|
|
base.PrimaryDatacenter = a.config.PrimaryDatacenter
|
|
base.DataDir = a.config.DataDir
|
|
base.NodeName = a.config.NodeName
|
|
|
|
base.CoordinateUpdateBatchSize = a.config.ConsulCoordinateUpdateBatchSize
|
|
base.CoordinateUpdateMaxBatches = a.config.ConsulCoordinateUpdateMaxBatches
|
|
base.CoordinateUpdatePeriod = a.config.ConsulCoordinateUpdatePeriod
|
|
base.CheckOutputMaxSize = a.config.CheckOutputMaxSize
|
|
|
|
base.RaftConfig.HeartbeatTimeout = a.config.ConsulRaftHeartbeatTimeout
|
|
base.RaftConfig.LeaderLeaseTimeout = a.config.ConsulRaftLeaderLeaseTimeout
|
|
base.RaftConfig.ElectionTimeout = a.config.ConsulRaftElectionTimeout
|
|
|
|
base.SerfLANConfig.MemberlistConfig.BindAddr = a.config.SerfBindAddrLAN.IP.String()
|
|
base.SerfLANConfig.MemberlistConfig.BindPort = a.config.SerfBindAddrLAN.Port
|
|
base.SerfLANConfig.MemberlistConfig.AdvertiseAddr = a.config.SerfAdvertiseAddrLAN.IP.String()
|
|
base.SerfLANConfig.MemberlistConfig.AdvertisePort = a.config.SerfAdvertiseAddrLAN.Port
|
|
base.SerfLANConfig.MemberlistConfig.GossipVerifyIncoming = a.config.EncryptVerifyIncoming
|
|
base.SerfLANConfig.MemberlistConfig.GossipVerifyOutgoing = a.config.EncryptVerifyOutgoing
|
|
base.SerfLANConfig.MemberlistConfig.GossipInterval = a.config.GossipLANGossipInterval
|
|
base.SerfLANConfig.MemberlistConfig.GossipNodes = a.config.GossipLANGossipNodes
|
|
base.SerfLANConfig.MemberlistConfig.ProbeInterval = a.config.GossipLANProbeInterval
|
|
base.SerfLANConfig.MemberlistConfig.ProbeTimeout = a.config.GossipLANProbeTimeout
|
|
base.SerfLANConfig.MemberlistConfig.SuspicionMult = a.config.GossipLANSuspicionMult
|
|
base.SerfLANConfig.MemberlistConfig.RetransmitMult = a.config.GossipLANRetransmitMult
|
|
if a.config.ReconnectTimeoutLAN != 0 {
|
|
base.SerfLANConfig.ReconnectTimeout = a.config.ReconnectTimeoutLAN
|
|
}
|
|
|
|
if a.config.SerfBindAddrWAN != nil {
|
|
base.SerfWANConfig.MemberlistConfig.BindAddr = a.config.SerfBindAddrWAN.IP.String()
|
|
base.SerfWANConfig.MemberlistConfig.BindPort = a.config.SerfBindAddrWAN.Port
|
|
base.SerfWANConfig.MemberlistConfig.AdvertiseAddr = a.config.SerfAdvertiseAddrWAN.IP.String()
|
|
base.SerfWANConfig.MemberlistConfig.AdvertisePort = a.config.SerfAdvertiseAddrWAN.Port
|
|
base.SerfWANConfig.MemberlistConfig.GossipVerifyIncoming = a.config.EncryptVerifyIncoming
|
|
base.SerfWANConfig.MemberlistConfig.GossipVerifyOutgoing = a.config.EncryptVerifyOutgoing
|
|
base.SerfWANConfig.MemberlistConfig.GossipInterval = a.config.GossipWANGossipInterval
|
|
base.SerfWANConfig.MemberlistConfig.GossipNodes = a.config.GossipWANGossipNodes
|
|
base.SerfWANConfig.MemberlistConfig.ProbeInterval = a.config.GossipWANProbeInterval
|
|
base.SerfWANConfig.MemberlistConfig.ProbeTimeout = a.config.GossipWANProbeTimeout
|
|
base.SerfWANConfig.MemberlistConfig.SuspicionMult = a.config.GossipWANSuspicionMult
|
|
base.SerfWANConfig.MemberlistConfig.RetransmitMult = a.config.GossipWANRetransmitMult
|
|
if a.config.ReconnectTimeoutWAN != 0 {
|
|
base.SerfWANConfig.ReconnectTimeout = a.config.ReconnectTimeoutWAN
|
|
}
|
|
} else {
|
|
// Disable serf WAN federation
|
|
base.SerfWANConfig = nil
|
|
}
|
|
|
|
base.RPCAddr = a.config.RPCBindAddr
|
|
base.RPCAdvertise = a.config.RPCAdvertiseAddr
|
|
|
|
base.Segment = a.config.SegmentName
|
|
if len(a.config.Segments) > 0 {
|
|
segments, err := a.segmentConfig()
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
base.Segments = segments
|
|
}
|
|
if a.config.Bootstrap {
|
|
base.Bootstrap = true
|
|
}
|
|
if a.config.CheckOutputMaxSize > 0 {
|
|
base.CheckOutputMaxSize = a.config.CheckOutputMaxSize
|
|
}
|
|
if a.config.RejoinAfterLeave {
|
|
base.RejoinAfterLeave = true
|
|
}
|
|
if a.config.BootstrapExpect != 0 {
|
|
base.BootstrapExpect = a.config.BootstrapExpect
|
|
}
|
|
if a.config.RPCProtocol > 0 {
|
|
base.ProtocolVersion = uint8(a.config.RPCProtocol)
|
|
}
|
|
if a.config.RaftProtocol != 0 {
|
|
base.RaftConfig.ProtocolVersion = raft.ProtocolVersion(a.config.RaftProtocol)
|
|
}
|
|
if a.config.RaftSnapshotThreshold != 0 {
|
|
base.RaftConfig.SnapshotThreshold = uint64(a.config.RaftSnapshotThreshold)
|
|
}
|
|
if a.config.RaftSnapshotInterval != 0 {
|
|
base.RaftConfig.SnapshotInterval = a.config.RaftSnapshotInterval
|
|
}
|
|
if a.config.RaftTrailingLogs != 0 {
|
|
base.RaftConfig.TrailingLogs = uint64(a.config.RaftTrailingLogs)
|
|
}
|
|
if a.config.ACLMasterToken != "" {
|
|
base.ACLMasterToken = a.config.ACLMasterToken
|
|
}
|
|
if a.config.ACLDatacenter != "" {
|
|
base.ACLDatacenter = a.config.ACLDatacenter
|
|
}
|
|
if a.config.ACLTokenTTL != 0 {
|
|
base.ACLTokenTTL = a.config.ACLTokenTTL
|
|
}
|
|
if a.config.ACLPolicyTTL != 0 {
|
|
base.ACLPolicyTTL = a.config.ACLPolicyTTL
|
|
}
|
|
if a.config.ACLRoleTTL != 0 {
|
|
base.ACLRoleTTL = a.config.ACLRoleTTL
|
|
}
|
|
if a.config.ACLDefaultPolicy != "" {
|
|
base.ACLDefaultPolicy = a.config.ACLDefaultPolicy
|
|
}
|
|
if a.config.ACLDownPolicy != "" {
|
|
base.ACLDownPolicy = a.config.ACLDownPolicy
|
|
}
|
|
base.ACLEnforceVersion8 = a.config.ACLEnforceVersion8
|
|
base.ACLTokenReplication = a.config.ACLTokenReplication
|
|
base.ACLsEnabled = a.config.ACLsEnabled
|
|
if a.config.ACLEnableKeyListPolicy {
|
|
base.ACLEnableKeyListPolicy = a.config.ACLEnableKeyListPolicy
|
|
}
|
|
if a.config.SessionTTLMin != 0 {
|
|
base.SessionTTLMin = a.config.SessionTTLMin
|
|
}
|
|
if a.config.NonVotingServer {
|
|
base.NonVoter = a.config.NonVotingServer
|
|
}
|
|
|
|
// These are fully specified in the agent defaults, so we can simply
|
|
// copy them over.
|
|
base.AutopilotConfig.CleanupDeadServers = a.config.AutopilotCleanupDeadServers
|
|
base.AutopilotConfig.LastContactThreshold = a.config.AutopilotLastContactThreshold
|
|
base.AutopilotConfig.MaxTrailingLogs = uint64(a.config.AutopilotMaxTrailingLogs)
|
|
base.AutopilotConfig.ServerStabilizationTime = a.config.AutopilotServerStabilizationTime
|
|
base.AutopilotConfig.RedundancyZoneTag = a.config.AutopilotRedundancyZoneTag
|
|
base.AutopilotConfig.DisableUpgradeMigration = a.config.AutopilotDisableUpgradeMigration
|
|
base.AutopilotConfig.UpgradeVersionTag = a.config.AutopilotUpgradeVersionTag
|
|
|
|
// make sure the advertise address is always set
|
|
if base.RPCAdvertise == nil {
|
|
base.RPCAdvertise = base.RPCAddr
|
|
}
|
|
|
|
// Rate limiting for RPC calls.
|
|
if a.config.RPCRateLimit > 0 {
|
|
base.RPCRate = a.config.RPCRateLimit
|
|
}
|
|
if a.config.RPCMaxBurst > 0 {
|
|
base.RPCMaxBurst = a.config.RPCMaxBurst
|
|
}
|
|
|
|
// RPC-related performance configs.
|
|
if a.config.RPCHoldTimeout > 0 {
|
|
base.RPCHoldTimeout = a.config.RPCHoldTimeout
|
|
}
|
|
if a.config.LeaveDrainTime > 0 {
|
|
base.LeaveDrainTime = a.config.LeaveDrainTime
|
|
}
|
|
|
|
// set the src address for outgoing rpc connections
|
|
// Use port 0 so that outgoing connections use a random port.
|
|
if !ipaddr.IsAny(base.RPCAddr.IP) {
|
|
base.RPCSrcAddr = &net.TCPAddr{IP: base.RPCAddr.IP}
|
|
}
|
|
|
|
// Format the build string
|
|
revision := a.config.Revision
|
|
if len(revision) > 8 {
|
|
revision = revision[:8]
|
|
}
|
|
base.Build = fmt.Sprintf("%s%s:%s", a.config.Version, a.config.VersionPrerelease, revision)
|
|
|
|
// Copy the TLS configuration
|
|
base.VerifyIncoming = a.config.VerifyIncoming || a.config.VerifyIncomingRPC
|
|
if a.config.CAPath != "" || a.config.CAFile != "" {
|
|
base.UseTLS = true
|
|
}
|
|
base.VerifyOutgoing = a.config.VerifyOutgoing
|
|
base.VerifyServerHostname = a.config.VerifyServerHostname
|
|
base.CAFile = a.config.CAFile
|
|
base.CAPath = a.config.CAPath
|
|
base.CertFile = a.config.CertFile
|
|
base.KeyFile = a.config.KeyFile
|
|
base.ServerName = a.config.ServerName
|
|
base.Domain = a.config.DNSDomain
|
|
base.TLSMinVersion = a.config.TLSMinVersion
|
|
base.TLSCipherSuites = a.config.TLSCipherSuites
|
|
base.TLSPreferServerCipherSuites = a.config.TLSPreferServerCipherSuites
|
|
|
|
base.AutoEncryptAllowTLS = a.config.AutoEncryptAllowTLS
|
|
|
|
// Copy the Connect CA bootstrap config
|
|
if a.config.ConnectEnabled {
|
|
base.ConnectEnabled = true
|
|
|
|
// Allow config to specify cluster_id provided it's a valid UUID. This is
|
|
// meant only for tests where a deterministic ID makes fixtures much simpler
|
|
// to work with but since it's only read on initial cluster bootstrap it's not
|
|
// that much of a liability in production. The worst a user could do is
|
|
// configure logically separate clusters with same ID by mistake but we can
|
|
// avoid documenting this is even an option.
|
|
if clusterID, ok := a.config.ConnectCAConfig["cluster_id"]; ok {
|
|
if cIDStr, ok := clusterID.(string); ok {
|
|
if _, err := uuid.ParseUUID(cIDStr); err == nil {
|
|
// Valid UUID configured, use that
|
|
base.CAConfig.ClusterID = cIDStr
|
|
}
|
|
}
|
|
if base.CAConfig.ClusterID == "" {
|
|
// If the tried to specify an ID but typoed it don't ignore as they will
|
|
// then bootstrap with a new ID and have to throw away the whole cluster
|
|
// and start again.
|
|
a.logger.Println("[ERR] connect CA config cluster_id specified but " +
|
|
"is not a valid UUID, aborting startup")
|
|
return nil, fmt.Errorf("cluster_id was supplied but was not a valid UUID")
|
|
}
|
|
}
|
|
|
|
if a.config.ConnectCAProvider != "" {
|
|
base.CAConfig.Provider = a.config.ConnectCAProvider
|
|
}
|
|
|
|
// Merge connect CA Config regardless of provider (since there are some
|
|
// common config options valid to all like leaf TTL).
|
|
for k, v := range a.config.ConnectCAConfig {
|
|
base.CAConfig.Config[k] = v
|
|
}
|
|
}
|
|
|
|
// Setup the user event callback
|
|
base.UserEventHandler = func(e serf.UserEvent) {
|
|
select {
|
|
case a.eventCh <- e:
|
|
case <-a.shutdownCh:
|
|
}
|
|
}
|
|
|
|
// Setup the loggers
|
|
base.LogLevel = a.config.LogLevel
|
|
base.LogOutput = a.LogOutput
|
|
|
|
// This will set up the LAN keyring, as well as the WAN and any segments
|
|
// for servers.
|
|
if err := a.setupKeyrings(base); err != nil {
|
|
return nil, fmt.Errorf("Failed to configure keyring: %v", err)
|
|
}
|
|
|
|
base.ConfigEntryBootstrap = a.config.ConfigEntryBootstrap
|
|
|
|
return base, nil
|
|
}
|
|
|
|
// Setup the serf and memberlist config for any defined network segments.
|
|
func (a *Agent) segmentConfig() ([]consul.NetworkSegment, error) {
|
|
var segments []consul.NetworkSegment
|
|
config := a.config
|
|
|
|
for _, s := range config.Segments {
|
|
serfConf := consul.DefaultConfig().SerfLANConfig
|
|
|
|
serfConf.MemberlistConfig.BindAddr = s.Bind.IP.String()
|
|
serfConf.MemberlistConfig.BindPort = s.Bind.Port
|
|
serfConf.MemberlistConfig.AdvertiseAddr = s.Advertise.IP.String()
|
|
serfConf.MemberlistConfig.AdvertisePort = s.Advertise.Port
|
|
|
|
if config.ReconnectTimeoutLAN != 0 {
|
|
serfConf.ReconnectTimeout = config.ReconnectTimeoutLAN
|
|
}
|
|
if config.EncryptVerifyIncoming {
|
|
serfConf.MemberlistConfig.GossipVerifyIncoming = config.EncryptVerifyIncoming
|
|
}
|
|
if config.EncryptVerifyOutgoing {
|
|
serfConf.MemberlistConfig.GossipVerifyOutgoing = config.EncryptVerifyOutgoing
|
|
}
|
|
|
|
var rpcAddr *net.TCPAddr
|
|
if s.RPCListener {
|
|
rpcAddr = &net.TCPAddr{
|
|
IP: s.Bind.IP,
|
|
Port: a.config.ServerPort,
|
|
}
|
|
}
|
|
|
|
segments = append(segments, consul.NetworkSegment{
|
|
Name: s.Name,
|
|
Bind: serfConf.MemberlistConfig.BindAddr,
|
|
Advertise: serfConf.MemberlistConfig.AdvertiseAddr,
|
|
Port: s.Bind.Port,
|
|
RPCAddr: rpcAddr,
|
|
SerfConfig: serfConf,
|
|
})
|
|
}
|
|
|
|
return segments, nil
|
|
}
|
|
|
|
// makeRandomID will generate a random UUID for a node.
|
|
func (a *Agent) makeRandomID() (string, error) {
|
|
id, err := uuid.GenerateUUID()
|
|
if err != nil {
|
|
return "", err
|
|
}
|
|
|
|
a.logger.Printf("[DEBUG] agent: Using random ID %q as node ID", id)
|
|
return id, nil
|
|
}
|
|
|
|
// makeNodeID will try to find a host-specific ID, or else will generate a
|
|
// random ID. The returned ID will always be formatted as a GUID. We don't tell
|
|
// the caller whether this ID is random or stable since the consequences are
|
|
// high for us if this changes, so we will persist it either way. This will let
|
|
// gopsutil change implementations without affecting in-place upgrades of nodes.
|
|
func (a *Agent) makeNodeID() (string, error) {
|
|
// If they've disabled host-based IDs then just make a random one.
|
|
if a.config.DisableHostNodeID {
|
|
return a.makeRandomID()
|
|
}
|
|
|
|
// Try to get a stable ID associated with the host itself.
|
|
info, err := host.Info()
|
|
if err != nil {
|
|
a.logger.Printf("[DEBUG] agent: Couldn't get a unique ID from the host: %v", err)
|
|
return a.makeRandomID()
|
|
}
|
|
|
|
// Make sure the host ID parses as a UUID, since we don't have complete
|
|
// control over this process.
|
|
id := strings.ToLower(info.HostID)
|
|
if _, err := uuid.ParseUUID(id); err != nil {
|
|
a.logger.Printf("[DEBUG] agent: Unique ID %q from host isn't formatted as a UUID: %v",
|
|
id, err)
|
|
return a.makeRandomID()
|
|
}
|
|
|
|
// Hash the input to make it well distributed. The reported Host UUID may be
|
|
// similar across nodes if they are on a cloud provider or on motherboards
|
|
// created from the same batch.
|
|
buf := sha512.Sum512([]byte(id))
|
|
id = fmt.Sprintf("%08x-%04x-%04x-%04x-%12x",
|
|
buf[0:4],
|
|
buf[4:6],
|
|
buf[6:8],
|
|
buf[8:10],
|
|
buf[10:16])
|
|
|
|
a.logger.Printf("[DEBUG] agent: Using unique ID %q from host as node ID", id)
|
|
return id, nil
|
|
}
|
|
|
|
// setupNodeID will pull the persisted node ID, if any, or create a random one
|
|
// and persist it.
|
|
func (a *Agent) setupNodeID(config *config.RuntimeConfig) error {
|
|
// If they've configured a node ID manually then just use that, as
|
|
// long as it's valid.
|
|
if config.NodeID != "" {
|
|
config.NodeID = types.NodeID(strings.ToLower(string(config.NodeID)))
|
|
if _, err := uuid.ParseUUID(string(config.NodeID)); err != nil {
|
|
return err
|
|
}
|
|
|
|
return nil
|
|
}
|
|
|
|
// For dev mode we have no filesystem access so just make one.
|
|
if a.config.DataDir == "" {
|
|
id, err := a.makeNodeID()
|
|
if err != nil {
|
|
return err
|
|
}
|
|
|
|
config.NodeID = types.NodeID(id)
|
|
return nil
|
|
}
|
|
|
|
// Load saved state, if any. Since a user could edit this, we also
|
|
// validate it.
|
|
fileID := filepath.Join(config.DataDir, "node-id")
|
|
if _, err := os.Stat(fileID); err == nil {
|
|
rawID, err := ioutil.ReadFile(fileID)
|
|
if err != nil {
|
|
return err
|
|
}
|
|
|
|
nodeID := strings.TrimSpace(string(rawID))
|
|
nodeID = strings.ToLower(nodeID)
|
|
if _, err := uuid.ParseUUID(nodeID); err != nil {
|
|
return err
|
|
}
|
|
|
|
config.NodeID = types.NodeID(nodeID)
|
|
}
|
|
|
|
// If we still don't have a valid node ID, make one.
|
|
if config.NodeID == "" {
|
|
id, err := a.makeNodeID()
|
|
if err != nil {
|
|
return err
|
|
}
|
|
if err := lib.EnsurePath(fileID, false); err != nil {
|
|
return err
|
|
}
|
|
if err := ioutil.WriteFile(fileID, []byte(id), 0600); err != nil {
|
|
return err
|
|
}
|
|
|
|
config.NodeID = types.NodeID(id)
|
|
}
|
|
return nil
|
|
}
|
|
|
|
// setupBaseKeyrings configures the LAN and WAN keyrings.
|
|
func (a *Agent) setupBaseKeyrings(config *consul.Config) error {
|
|
// If the keyring file is disabled then just poke the provided key
|
|
// into the in-memory keyring.
|
|
federationEnabled := config.SerfWANConfig != nil
|
|
if a.config.DisableKeyringFile {
|
|
if a.config.EncryptKey == "" {
|
|
return nil
|
|
}
|
|
|
|
keys := []string{a.config.EncryptKey}
|
|
if err := loadKeyring(config.SerfLANConfig, keys); err != nil {
|
|
return err
|
|
}
|
|
if a.config.ServerMode && federationEnabled {
|
|
if err := loadKeyring(config.SerfWANConfig, keys); err != nil {
|
|
return err
|
|
}
|
|
}
|
|
return nil
|
|
}
|
|
|
|
// Otherwise, we need to deal with the keyring files.
|
|
fileLAN := filepath.Join(a.config.DataDir, SerfLANKeyring)
|
|
fileWAN := filepath.Join(a.config.DataDir, SerfWANKeyring)
|
|
|
|
if a.config.EncryptKey == "" {
|
|
goto LOAD
|
|
}
|
|
if _, err := os.Stat(fileLAN); err != nil {
|
|
if err := initKeyring(fileLAN, a.config.EncryptKey); err != nil {
|
|
return err
|
|
}
|
|
}
|
|
if a.config.ServerMode && federationEnabled {
|
|
if _, err := os.Stat(fileWAN); err != nil {
|
|
if err := initKeyring(fileWAN, a.config.EncryptKey); err != nil {
|
|
return err
|
|
}
|
|
}
|
|
}
|
|
|
|
LOAD:
|
|
if _, err := os.Stat(fileLAN); err == nil {
|
|
config.SerfLANConfig.KeyringFile = fileLAN
|
|
}
|
|
if err := loadKeyringFile(config.SerfLANConfig); err != nil {
|
|
return err
|
|
}
|
|
if a.config.ServerMode && federationEnabled {
|
|
if _, err := os.Stat(fileWAN); err == nil {
|
|
config.SerfWANConfig.KeyringFile = fileWAN
|
|
}
|
|
if err := loadKeyringFile(config.SerfWANConfig); err != nil {
|
|
return err
|
|
}
|
|
}
|
|
|
|
return nil
|
|
}
|
|
|
|
// setupKeyrings is used to initialize and load keyrings during agent startup.
|
|
func (a *Agent) setupKeyrings(config *consul.Config) error {
|
|
// First set up the LAN and WAN keyrings.
|
|
if err := a.setupBaseKeyrings(config); err != nil {
|
|
return err
|
|
}
|
|
|
|
// If there's no LAN keyring then there's nothing else to set up for
|
|
// any segments.
|
|
lanKeyring := config.SerfLANConfig.MemberlistConfig.Keyring
|
|
if lanKeyring == nil {
|
|
return nil
|
|
}
|
|
|
|
// Copy the initial state of the LAN keyring into each segment config.
|
|
// Segments don't have their own keyring file, they rely on the LAN
|
|
// holding the state so things can't get out of sync.
|
|
k, pk := lanKeyring.GetKeys(), lanKeyring.GetPrimaryKey()
|
|
for _, segment := range config.Segments {
|
|
keyring, err := memberlist.NewKeyring(k, pk)
|
|
if err != nil {
|
|
return err
|
|
}
|
|
segment.SerfConfig.MemberlistConfig.Keyring = keyring
|
|
}
|
|
return nil
|
|
}
|
|
|
|
// registerEndpoint registers a handler for the consul RPC server
|
|
// under a unique name while making it accessible under the provided
|
|
// name. This allows overwriting handlers for the golang net/rpc
|
|
// service which does not allow this.
|
|
func (a *Agent) registerEndpoint(name string, handler interface{}) error {
|
|
srv, ok := a.delegate.(*consul.Server)
|
|
if !ok {
|
|
panic("agent must be a server")
|
|
}
|
|
realname := fmt.Sprintf("%s-%d", name, time.Now().UnixNano())
|
|
a.endpointsLock.Lock()
|
|
a.endpoints[name] = realname
|
|
a.endpointsLock.Unlock()
|
|
return srv.RegisterEndpoint(realname, handler)
|
|
}
|
|
|
|
// RPC is used to make an RPC call to the Consul servers
|
|
// This allows the agent to implement the Consul.Interface
|
|
func (a *Agent) RPC(method string, args interface{}, reply interface{}) error {
|
|
a.endpointsLock.RLock()
|
|
// fast path: only translate if there are overrides
|
|
if len(a.endpoints) > 0 {
|
|
p := strings.SplitN(method, ".", 2)
|
|
if e := a.endpoints[p[0]]; e != "" {
|
|
method = e + "." + p[1]
|
|
}
|
|
}
|
|
a.endpointsLock.RUnlock()
|
|
return a.delegate.RPC(method, args, reply)
|
|
}
|
|
|
|
// SnapshotRPC performs the requested snapshot RPC against the Consul server in
|
|
// a streaming manner. The contents of in will be read and passed along as the
|
|
// payload, and the response message will determine the error status, and any
|
|
// return payload will be written to out.
|
|
func (a *Agent) SnapshotRPC(args *structs.SnapshotRequest, in io.Reader, out io.Writer,
|
|
replyFn structs.SnapshotReplyFn) error {
|
|
return a.delegate.SnapshotRPC(args, in, out, replyFn)
|
|
}
|
|
|
|
// Leave is used to prepare the agent for a graceful shutdown
|
|
func (a *Agent) Leave() error {
|
|
return a.delegate.Leave()
|
|
}
|
|
|
|
// ShutdownAgent is used to hard stop the agent. Should be preceded by
|
|
// Leave to do it gracefully. Should be followed by ShutdownEndpoints to
|
|
// terminate the HTTP and DNS servers as well.
|
|
func (a *Agent) ShutdownAgent() error {
|
|
a.shutdownLock.Lock()
|
|
defer a.shutdownLock.Unlock()
|
|
|
|
if a.shutdown {
|
|
return nil
|
|
}
|
|
a.logger.Println("[INFO] agent: Requesting shutdown")
|
|
|
|
// Stop the service manager (must happen before we take the stateLock to avoid deadlock)
|
|
if a.serviceManager != nil {
|
|
a.serviceManager.Stop()
|
|
}
|
|
|
|
// Stop all the checks
|
|
a.stateLock.Lock()
|
|
defer a.stateLock.Unlock()
|
|
for _, chk := range a.checkMonitors {
|
|
chk.Stop()
|
|
}
|
|
for _, chk := range a.checkTTLs {
|
|
chk.Stop()
|
|
}
|
|
for _, chk := range a.checkHTTPs {
|
|
chk.Stop()
|
|
}
|
|
for _, chk := range a.checkTCPs {
|
|
chk.Stop()
|
|
}
|
|
for _, chk := range a.checkGRPCs {
|
|
chk.Stop()
|
|
}
|
|
for _, chk := range a.checkDockers {
|
|
chk.Stop()
|
|
}
|
|
for _, chk := range a.checkAliases {
|
|
chk.Stop()
|
|
}
|
|
|
|
// Stop gRPC
|
|
if a.grpcServer != nil {
|
|
a.grpcServer.Stop()
|
|
}
|
|
|
|
// Stop the proxy config manager
|
|
if a.proxyConfig != nil {
|
|
a.proxyConfig.Close()
|
|
}
|
|
|
|
// Stop the cache background work
|
|
if a.cache != nil {
|
|
a.cache.Close()
|
|
}
|
|
|
|
var err error
|
|
if a.delegate != nil {
|
|
err = a.delegate.Shutdown()
|
|
if _, ok := a.delegate.(*consul.Server); ok {
|
|
a.logger.Print("[INFO] agent: consul server down")
|
|
} else {
|
|
a.logger.Print("[INFO] agent: consul client down")
|
|
}
|
|
}
|
|
|
|
pidErr := a.deletePid()
|
|
if pidErr != nil {
|
|
a.logger.Println("[WARN] agent: could not delete pid file ", pidErr)
|
|
}
|
|
|
|
a.logger.Println("[INFO] agent: shutdown complete")
|
|
a.shutdown = true
|
|
close(a.shutdownCh)
|
|
return err
|
|
}
|
|
|
|
// ShutdownEndpoints terminates the HTTP and DNS servers. Should be
|
|
// preceded by ShutdownAgent.
|
|
func (a *Agent) ShutdownEndpoints() {
|
|
a.shutdownLock.Lock()
|
|
defer a.shutdownLock.Unlock()
|
|
|
|
if len(a.dnsServers) == 0 && len(a.httpServers) == 0 {
|
|
return
|
|
}
|
|
|
|
for _, srv := range a.dnsServers {
|
|
if srv.Server != nil {
|
|
a.logger.Printf("[INFO] agent: Stopping DNS server %s (%s)", srv.Server.Addr, srv.Server.Net)
|
|
srv.Shutdown()
|
|
}
|
|
}
|
|
a.dnsServers = nil
|
|
|
|
for _, srv := range a.httpServers {
|
|
a.logger.Printf("[INFO] agent: Stopping %s server %s (%s)", strings.ToUpper(srv.proto), srv.ln.Addr().String(), srv.ln.Addr().Network())
|
|
ctx, cancel := context.WithTimeout(context.Background(), time.Second)
|
|
defer cancel()
|
|
srv.Shutdown(ctx)
|
|
if ctx.Err() == context.DeadlineExceeded {
|
|
a.logger.Printf("[WARN] agent: Timeout stopping %s server %s (%s)", strings.ToUpper(srv.proto), srv.ln.Addr().String(), srv.ln.Addr().Network())
|
|
}
|
|
}
|
|
a.httpServers = nil
|
|
|
|
a.logger.Println("[INFO] agent: Waiting for endpoints to shut down")
|
|
a.wgServers.Wait()
|
|
a.logger.Print("[INFO] agent: Endpoints down")
|
|
}
|
|
|
|
// ReloadCh is used to return a channel that can be
|
|
// used for triggering reloads and returning a response.
|
|
func (a *Agent) ReloadCh() chan chan error {
|
|
return a.reloadCh
|
|
}
|
|
|
|
// RetryJoinCh is a channel that transports errors
|
|
// from the retry join process.
|
|
func (a *Agent) RetryJoinCh() <-chan error {
|
|
return a.retryJoinCh
|
|
}
|
|
|
|
// ShutdownCh is used to return a channel that can be
|
|
// selected to wait for the agent to perform a shutdown.
|
|
func (a *Agent) ShutdownCh() <-chan struct{} {
|
|
return a.shutdownCh
|
|
}
|
|
|
|
// JoinLAN is used to have the agent join a LAN cluster
|
|
func (a *Agent) JoinLAN(addrs []string) (n int, err error) {
|
|
a.logger.Printf("[INFO] agent: (LAN) joining: %v", addrs)
|
|
n, err = a.delegate.JoinLAN(addrs)
|
|
if err == nil {
|
|
a.logger.Printf("[INFO] agent: (LAN) joined: %d", n)
|
|
if a.joinLANNotifier != nil {
|
|
if notifErr := a.joinLANNotifier.Notify(systemd.Ready); notifErr != nil {
|
|
a.logger.Printf("[DEBUG] agent: systemd notify failed: %v", notifErr)
|
|
}
|
|
}
|
|
} else {
|
|
a.logger.Printf("[WARN] agent: (LAN) couldn't join: %d Err: %v", n, err)
|
|
}
|
|
return
|
|
}
|
|
|
|
// JoinWAN is used to have the agent join a WAN cluster
|
|
func (a *Agent) JoinWAN(addrs []string) (n int, err error) {
|
|
a.logger.Printf("[INFO] agent: (WAN) joining: %v", addrs)
|
|
if srv, ok := a.delegate.(*consul.Server); ok {
|
|
n, err = srv.JoinWAN(addrs)
|
|
} else {
|
|
err = fmt.Errorf("Must be a server to join WAN cluster")
|
|
}
|
|
if err == nil {
|
|
a.logger.Printf("[INFO] agent: (WAN) joined: %d", n)
|
|
} else {
|
|
a.logger.Printf("[WARN] agent: (WAN) couldn't join: %d Err: %v", n, err)
|
|
}
|
|
return
|
|
}
|
|
|
|
// ForceLeave is used to remove a failed node from the cluster
|
|
func (a *Agent) ForceLeave(node string, prune bool) (err error) {
|
|
a.logger.Printf("[INFO] agent: Force leaving node: %v", node)
|
|
err = a.delegate.RemoveFailedNode(node, prune)
|
|
if err != nil {
|
|
a.logger.Printf("[WARN] agent: Failed to remove node: %v", err)
|
|
}
|
|
return err
|
|
}
|
|
|
|
// LocalMember is used to return the local node
|
|
func (a *Agent) LocalMember() serf.Member {
|
|
return a.delegate.LocalMember()
|
|
}
|
|
|
|
// LANMembers is used to retrieve the LAN members
|
|
func (a *Agent) LANMembers() []serf.Member {
|
|
return a.delegate.LANMembers()
|
|
}
|
|
|
|
// WANMembers is used to retrieve the WAN members
|
|
func (a *Agent) WANMembers() []serf.Member {
|
|
if srv, ok := a.delegate.(*consul.Server); ok {
|
|
return srv.WANMembers()
|
|
}
|
|
return nil
|
|
}
|
|
|
|
// StartSync is called once Services and Checks are registered.
|
|
// This is called to prevent a race between clients and the anti-entropy routines
|
|
func (a *Agent) StartSync() {
|
|
go a.sync.Run()
|
|
a.logger.Printf("[INFO] agent: started state syncer")
|
|
}
|
|
|
|
// PauseSync is used to pause anti-entropy while bulk changes are made. It also
|
|
// sets state that agent-local watches use to "ride out" config reloads and bulk
|
|
// updates which might spuriously unload state and reload it again.
|
|
func (a *Agent) PauseSync() {
|
|
// Do this outside of lock as it has it's own locking
|
|
a.sync.Pause()
|
|
|
|
// Coordinate local state watchers
|
|
a.syncMu.Lock()
|
|
defer a.syncMu.Unlock()
|
|
if a.syncCh == nil {
|
|
a.syncCh = make(chan struct{})
|
|
}
|
|
}
|
|
|
|
// ResumeSync is used to unpause anti-entropy after bulk changes are make
|
|
func (a *Agent) ResumeSync() {
|
|
// a.sync maintains a stack/ref count of Pause calls since we call
|
|
// Pause/Resume in nested way during a reload and AddService. We only want to
|
|
// trigger local state watchers if this Resume call actually started sync back
|
|
// up again (i.e. was the last resume on the stack). We could check that
|
|
// separately with a.sync.Paused but that is racey since another Pause call
|
|
// might be made between our Resume and checking Paused.
|
|
resumed := a.sync.Resume()
|
|
|
|
if !resumed {
|
|
// Return early so we don't notify local watchers until we are actually
|
|
// resumed.
|
|
return
|
|
}
|
|
|
|
// Coordinate local state watchers
|
|
a.syncMu.Lock()
|
|
defer a.syncMu.Unlock()
|
|
|
|
if a.syncCh != nil {
|
|
close(a.syncCh)
|
|
a.syncCh = nil
|
|
}
|
|
}
|
|
|
|
// syncPausedCh returns either a channel or nil. If nil sync is not paused. If
|
|
// non-nil, the channel will be closed when sync resumes.
|
|
func (a *Agent) SyncPausedCh() <-chan struct{} {
|
|
a.syncMu.Lock()
|
|
defer a.syncMu.Unlock()
|
|
return a.syncCh
|
|
}
|
|
|
|
// GetLANCoordinate returns the coordinates of this node in the local pools
|
|
// (assumes coordinates are enabled, so check that before calling).
|
|
func (a *Agent) GetLANCoordinate() (lib.CoordinateSet, error) {
|
|
return a.delegate.GetLANCoordinate()
|
|
}
|
|
|
|
// sendCoordinate is a long-running loop that periodically sends our coordinate
|
|
// to the server. Closing the agent's shutdownChannel will cause this to exit.
|
|
func (a *Agent) sendCoordinate() {
|
|
OUTER:
|
|
for {
|
|
rate := a.config.SyncCoordinateRateTarget
|
|
min := a.config.SyncCoordinateIntervalMin
|
|
intv := lib.RateScaledInterval(rate, min, len(a.LANMembers()))
|
|
intv = intv + lib.RandomStagger(intv)
|
|
|
|
select {
|
|
case <-time.After(intv):
|
|
members := a.LANMembers()
|
|
grok, err := consul.CanServersUnderstandProtocol(members, 3)
|
|
if err != nil {
|
|
a.logger.Printf("[ERR] agent: Failed to check servers: %s", err)
|
|
continue
|
|
}
|
|
if !grok {
|
|
a.logger.Printf("[DEBUG] agent: Skipping coordinate updates until servers are upgraded")
|
|
continue
|
|
}
|
|
|
|
cs, err := a.GetLANCoordinate()
|
|
if err != nil {
|
|
a.logger.Printf("[ERR] agent: Failed to get coordinate: %s", err)
|
|
continue
|
|
}
|
|
|
|
for segment, coord := range cs {
|
|
req := structs.CoordinateUpdateRequest{
|
|
Datacenter: a.config.Datacenter,
|
|
Node: a.config.NodeName,
|
|
Segment: segment,
|
|
Coord: coord,
|
|
WriteRequest: structs.WriteRequest{Token: a.tokens.AgentToken()},
|
|
}
|
|
var reply struct{}
|
|
if err := a.RPC("Coordinate.Update", &req, &reply); err != nil {
|
|
if acl.IsErrPermissionDenied(err) {
|
|
a.logger.Printf("[WARN] agent: Coordinate update blocked by ACLs")
|
|
} else {
|
|
a.logger.Printf("[ERR] agent: Coordinate update error: %v", err)
|
|
}
|
|
continue OUTER
|
|
}
|
|
}
|
|
case <-a.shutdownCh:
|
|
return
|
|
}
|
|
}
|
|
}
|
|
|
|
// reapServicesInternal does a single pass, looking for services to reap.
|
|
func (a *Agent) reapServicesInternal() {
|
|
reaped := make(map[string]bool)
|
|
for checkID, cs := range a.State.CriticalCheckStates() {
|
|
serviceID := cs.Check.ServiceID
|
|
|
|
// There's nothing to do if there's no service.
|
|
if serviceID == "" {
|
|
continue
|
|
}
|
|
|
|
// There might be multiple checks for one service, so
|
|
// we don't need to reap multiple times.
|
|
if reaped[serviceID] {
|
|
continue
|
|
}
|
|
|
|
// See if there's a timeout.
|
|
// todo(fs): this looks fishy... why is there another data structure in the agent with its own lock?
|
|
a.stateLock.Lock()
|
|
timeout := a.checkReapAfter[checkID]
|
|
a.stateLock.Unlock()
|
|
|
|
// Reap, if necessary. We keep track of which service
|
|
// this is so that we won't try to remove it again.
|
|
if timeout > 0 && cs.CriticalFor() > timeout {
|
|
reaped[serviceID] = true
|
|
if err := a.RemoveService(serviceID); err != nil {
|
|
a.logger.Printf("[ERR] agent: unable to deregister service %q after check %q has been critical for too long: %s",
|
|
serviceID, checkID, err)
|
|
} else {
|
|
a.logger.Printf("[INFO] agent: Check %q for service %q has been critical for too long; deregistered service",
|
|
checkID, serviceID)
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
// reapServices is a long running goroutine that looks for checks that have been
|
|
// critical too long and deregisters their associated services.
|
|
func (a *Agent) reapServices() {
|
|
for {
|
|
select {
|
|
case <-time.After(a.config.CheckReapInterval):
|
|
a.reapServicesInternal()
|
|
|
|
case <-a.shutdownCh:
|
|
return
|
|
}
|
|
}
|
|
|
|
}
|
|
|
|
// persistedService is used to wrap a service definition and bundle it
|
|
// with an ACL token so we can restore both at a later agent start.
|
|
type persistedService struct {
|
|
Token string
|
|
Service *structs.NodeService
|
|
Source string
|
|
}
|
|
|
|
// persistService saves a service definition to a JSON file in the data dir
|
|
func (a *Agent) persistService(service *structs.NodeService, source configSource) error {
|
|
svcPath := filepath.Join(a.config.DataDir, servicesDir, stringHash(service.ID))
|
|
|
|
wrapped := persistedService{
|
|
Token: a.State.ServiceToken(service.ID),
|
|
Service: service,
|
|
Source: source.String(),
|
|
}
|
|
encoded, err := json.Marshal(wrapped)
|
|
if err != nil {
|
|
return err
|
|
}
|
|
|
|
return file.WriteAtomic(svcPath, encoded)
|
|
}
|
|
|
|
// purgeService removes a persisted service definition file from the data dir
|
|
func (a *Agent) purgeService(serviceID string) error {
|
|
svcPath := filepath.Join(a.config.DataDir, servicesDir, stringHash(serviceID))
|
|
if _, err := os.Stat(svcPath); err == nil {
|
|
return os.Remove(svcPath)
|
|
}
|
|
return nil
|
|
}
|
|
|
|
// persistCheck saves a check definition to the local agent's state directory
|
|
func (a *Agent) persistCheck(check *structs.HealthCheck, chkType *structs.CheckType, source configSource) error {
|
|
checkPath := filepath.Join(a.config.DataDir, checksDir, checkIDHash(check.CheckID))
|
|
|
|
// Create the persisted check
|
|
wrapped := persistedCheck{
|
|
Check: check,
|
|
ChkType: chkType,
|
|
Token: a.State.CheckToken(check.CheckID),
|
|
Source: source.String(),
|
|
}
|
|
|
|
encoded, err := json.Marshal(wrapped)
|
|
if err != nil {
|
|
return err
|
|
}
|
|
|
|
return file.WriteAtomic(checkPath, encoded)
|
|
}
|
|
|
|
// purgeCheck removes a persisted check definition file from the data dir
|
|
func (a *Agent) purgeCheck(checkID types.CheckID) error {
|
|
checkPath := filepath.Join(a.config.DataDir, checksDir, checkIDHash(checkID))
|
|
if _, err := os.Stat(checkPath); err == nil {
|
|
return os.Remove(checkPath)
|
|
}
|
|
return nil
|
|
}
|
|
|
|
// persistedServiceConfig is used to serialize the resolved service config that
|
|
// feeds into the ServiceManager at registration time so that it may be
|
|
// restored later on.
|
|
type persistedServiceConfig struct {
|
|
ServiceID string
|
|
Defaults *structs.ServiceConfigResponse
|
|
}
|
|
|
|
func (a *Agent) persistServiceConfig(serviceID string, defaults *structs.ServiceConfigResponse) error {
|
|
// Create the persisted config.
|
|
wrapped := persistedServiceConfig{
|
|
ServiceID: serviceID,
|
|
Defaults: defaults,
|
|
}
|
|
|
|
encoded, err := json.Marshal(wrapped)
|
|
if err != nil {
|
|
return err
|
|
}
|
|
|
|
dir := filepath.Join(a.config.DataDir, serviceConfigDir)
|
|
configPath := filepath.Join(dir, stringHash(serviceID))
|
|
|
|
// Create the config dir if it doesn't exist
|
|
if err := os.MkdirAll(dir, 0700); err != nil {
|
|
return fmt.Errorf("failed creating service configs dir %q: %s", dir, err)
|
|
}
|
|
|
|
return file.WriteAtomic(configPath, encoded)
|
|
}
|
|
|
|
func (a *Agent) purgeServiceConfig(serviceID string) error {
|
|
configPath := filepath.Join(a.config.DataDir, serviceConfigDir, stringHash(serviceID))
|
|
if _, err := os.Stat(configPath); err == nil {
|
|
return os.Remove(configPath)
|
|
}
|
|
return nil
|
|
}
|
|
|
|
func (a *Agent) readPersistedServiceConfigs() (map[string]*structs.ServiceConfigResponse, error) {
|
|
out := make(map[string]*structs.ServiceConfigResponse)
|
|
|
|
configDir := filepath.Join(a.config.DataDir, serviceConfigDir)
|
|
files, err := ioutil.ReadDir(configDir)
|
|
if err != nil {
|
|
if os.IsNotExist(err) {
|
|
return nil, nil
|
|
}
|
|
return nil, fmt.Errorf("Failed reading service configs dir %q: %s", configDir, err)
|
|
}
|
|
|
|
for _, fi := range files {
|
|
// Skip all dirs
|
|
if fi.IsDir() {
|
|
continue
|
|
}
|
|
|
|
// Skip all partially written temporary files
|
|
if strings.HasSuffix(fi.Name(), "tmp") {
|
|
a.logger.Printf("[WARN] agent: Ignoring temporary service config file %v", fi.Name())
|
|
continue
|
|
}
|
|
|
|
// Read the contents into a buffer
|
|
file := filepath.Join(configDir, fi.Name())
|
|
buf, err := ioutil.ReadFile(file)
|
|
if err != nil {
|
|
return nil, fmt.Errorf("failed reading service config file %q: %s", file, err)
|
|
}
|
|
|
|
// Try decoding the service config definition
|
|
var p persistedServiceConfig
|
|
if err := json.Unmarshal(buf, &p); err != nil {
|
|
a.logger.Printf("[ERR] agent: Failed decoding service config file %q: %s", file, err)
|
|
continue
|
|
}
|
|
out[p.ServiceID] = p.Defaults
|
|
}
|
|
|
|
return out, nil
|
|
}
|
|
|
|
// AddServiceAndReplaceChecks is used to add a service entry and its check. Any check for this service missing from chkTypes will be deleted.
|
|
// This entry is persistent and the agent will make a best effort to
|
|
// ensure it is registered
|
|
func (a *Agent) AddServiceAndReplaceChecks(service *structs.NodeService, chkTypes []*structs.CheckType, persist bool, token string, source configSource) error {
|
|
a.stateLock.Lock()
|
|
defer a.stateLock.Unlock()
|
|
return a.addServiceLocked(&addServiceRequest{
|
|
service: service,
|
|
chkTypes: chkTypes,
|
|
previousDefaults: nil,
|
|
waitForCentralConfig: true,
|
|
persist: persist,
|
|
persistServiceConfig: true,
|
|
token: token,
|
|
replaceExistingChecks: true,
|
|
source: source,
|
|
})
|
|
}
|
|
|
|
// AddService is used to add a service entry.
|
|
// This entry is persistent and the agent will make a best effort to
|
|
// ensure it is registered
|
|
func (a *Agent) AddService(service *structs.NodeService, chkTypes []*structs.CheckType, persist bool, token string, source configSource) error {
|
|
a.stateLock.Lock()
|
|
defer a.stateLock.Unlock()
|
|
return a.addServiceLocked(&addServiceRequest{
|
|
service: service,
|
|
chkTypes: chkTypes,
|
|
previousDefaults: nil,
|
|
waitForCentralConfig: true,
|
|
persist: persist,
|
|
persistServiceConfig: true,
|
|
token: token,
|
|
replaceExistingChecks: false,
|
|
source: source,
|
|
})
|
|
}
|
|
|
|
// addServiceLocked adds a service entry to the service manager if enabled, or directly
|
|
// to the local state if it is not. This function assumes the state lock is already held.
|
|
func (a *Agent) addServiceLocked(req *addServiceRequest) error {
|
|
req.fixupForAddServiceLocked()
|
|
|
|
if err := a.validateService(req.service, req.chkTypes); err != nil {
|
|
return err
|
|
}
|
|
|
|
if a.config.EnableCentralServiceConfig {
|
|
return a.serviceManager.AddService(req)
|
|
}
|
|
|
|
// previousDefaults are ignored here because they are only relevant for central config.
|
|
req.persistService = nil
|
|
req.persistDefaults = nil
|
|
req.persistServiceConfig = false
|
|
|
|
return a.addServiceInternal(req)
|
|
}
|
|
|
|
// addServiceRequest is the union of arguments for calling both
|
|
// addServiceLocked and addServiceInternal. The overlap was significant enough
|
|
// to warrant merging them and indicating which fields are meant to be set only
|
|
// in one of the two contexts.
|
|
//
|
|
// Before using the request struct one of the fixupFor*() methods should be
|
|
// invoked to clear irrelevant fields.
|
|
//
|
|
// The ServiceManager.AddService signature is largely just a passthrough for
|
|
// addServiceLocked and should be treated as such.
|
|
type addServiceRequest struct {
|
|
service *structs.NodeService
|
|
chkTypes []*structs.CheckType
|
|
previousDefaults *structs.ServiceConfigResponse // just for: addServiceLocked
|
|
waitForCentralConfig bool // just for: addServiceLocked
|
|
persistService *structs.NodeService // just for: addServiceInternal
|
|
persistDefaults *structs.ServiceConfigResponse // just for: addServiceInternal
|
|
persist bool
|
|
persistServiceConfig bool
|
|
token string
|
|
replaceExistingChecks bool
|
|
source configSource
|
|
}
|
|
|
|
func (r *addServiceRequest) fixupForAddServiceLocked() {
|
|
r.persistService = nil
|
|
r.persistDefaults = nil
|
|
}
|
|
|
|
func (r *addServiceRequest) fixupForAddServiceInternal() {
|
|
r.previousDefaults = nil
|
|
r.waitForCentralConfig = false
|
|
}
|
|
|
|
// addServiceInternal adds the given service and checks to the local state.
|
|
func (a *Agent) addServiceInternal(req *addServiceRequest) error {
|
|
req.fixupForAddServiceInternal()
|
|
var (
|
|
service = req.service
|
|
chkTypes = req.chkTypes
|
|
persistService = req.persistService
|
|
persistDefaults = req.persistDefaults
|
|
persist = req.persist
|
|
persistServiceConfig = req.persistServiceConfig
|
|
token = req.token
|
|
replaceExistingChecks = req.replaceExistingChecks
|
|
source = req.source
|
|
)
|
|
|
|
// Pause the service syncs during modification
|
|
a.PauseSync()
|
|
defer a.ResumeSync()
|
|
|
|
// Take a snapshot of the current state of checks (if any), and when adding
|
|
// a check that already existed carry over the state before resuming
|
|
// anti-entropy.
|
|
snap := a.snapshotCheckState()
|
|
|
|
var checks []*structs.HealthCheck
|
|
|
|
existingChecks := map[types.CheckID]bool{}
|
|
for _, check := range a.State.Checks() {
|
|
if check.ServiceID == service.ID {
|
|
existingChecks[check.CheckID] = false
|
|
}
|
|
}
|
|
|
|
// Create an associated health check
|
|
for i, chkType := range chkTypes {
|
|
existingChecks[chkType.CheckID] = true
|
|
|
|
checkID := string(chkType.CheckID)
|
|
if checkID == "" {
|
|
checkID = fmt.Sprintf("service:%s", service.ID)
|
|
if len(chkTypes) > 1 {
|
|
checkID += fmt.Sprintf(":%d", i+1)
|
|
}
|
|
}
|
|
name := chkType.Name
|
|
if name == "" {
|
|
name = fmt.Sprintf("Service '%s' check", service.Service)
|
|
}
|
|
check := &structs.HealthCheck{
|
|
Node: a.config.NodeName,
|
|
CheckID: types.CheckID(checkID),
|
|
Name: name,
|
|
Status: api.HealthCritical,
|
|
Notes: chkType.Notes,
|
|
ServiceID: service.ID,
|
|
ServiceName: service.Service,
|
|
ServiceTags: service.Tags,
|
|
}
|
|
if chkType.Status != "" {
|
|
check.Status = chkType.Status
|
|
}
|
|
|
|
// Restore the fields from the snapshot.
|
|
prev, ok := snap[check.CheckID]
|
|
if ok {
|
|
check.Output = prev.Output
|
|
check.Status = prev.Status
|
|
}
|
|
|
|
checks = append(checks, check)
|
|
}
|
|
|
|
// cleanup, store the ids of services and checks that weren't previously
|
|
// registered so we clean them up if something fails halfway through the
|
|
// process.
|
|
var cleanupServices []string
|
|
var cleanupChecks []types.CheckID
|
|
|
|
if s := a.State.Service(service.ID); s == nil {
|
|
cleanupServices = append(cleanupServices, service.ID)
|
|
}
|
|
|
|
for _, check := range checks {
|
|
if c := a.State.Check(check.CheckID); c == nil {
|
|
cleanupChecks = append(cleanupChecks, check.CheckID)
|
|
}
|
|
}
|
|
|
|
err := a.State.AddServiceWithChecks(service, checks, token)
|
|
if err != nil {
|
|
a.cleanupRegistration(cleanupServices, cleanupChecks)
|
|
return err
|
|
}
|
|
|
|
for i := range checks {
|
|
if err := a.addCheck(checks[i], chkTypes[i], service, persist, token, source); err != nil {
|
|
a.cleanupRegistration(cleanupServices, cleanupChecks)
|
|
return err
|
|
}
|
|
|
|
if persist && a.config.DataDir != "" {
|
|
if err := a.persistCheck(checks[i], chkTypes[i], source); err != nil {
|
|
a.cleanupRegistration(cleanupServices, cleanupChecks)
|
|
return err
|
|
|
|
}
|
|
}
|
|
}
|
|
|
|
// If a proxy service wishes to expose checks, check targets need to be rerouted to the proxy listener
|
|
// This needs to be called after chkTypes are added to the agent, to avoid being overwritten
|
|
if service.Proxy.Expose.Checks {
|
|
err := a.rerouteExposedChecks(service.Proxy.DestinationServiceID, service.Proxy.LocalServiceAddress)
|
|
if err != nil {
|
|
a.logger.Println("[WARN] failed to reroute L7 checks to exposed proxy listener")
|
|
}
|
|
} else {
|
|
// Reset check targets if proxy was re-registered but no longer wants to expose checks
|
|
// If the proxy is being registered for the first time then this is a no-op
|
|
a.resetExposedChecks(service.Proxy.DestinationServiceID)
|
|
}
|
|
|
|
if persistServiceConfig && a.config.DataDir != "" {
|
|
var err error
|
|
if persistDefaults != nil {
|
|
err = a.persistServiceConfig(service.ID, persistDefaults)
|
|
} else {
|
|
err = a.purgeServiceConfig(service.ID)
|
|
}
|
|
|
|
if err != nil {
|
|
a.cleanupRegistration(cleanupServices, cleanupChecks)
|
|
return err
|
|
}
|
|
}
|
|
|
|
// Persist the service to a file
|
|
if persist && a.config.DataDir != "" {
|
|
if persistService == nil {
|
|
persistService = service
|
|
}
|
|
|
|
if err := a.persistService(persistService, source); err != nil {
|
|
a.cleanupRegistration(cleanupServices, cleanupChecks)
|
|
return err
|
|
}
|
|
}
|
|
|
|
if replaceExistingChecks {
|
|
for checkID, keep := range existingChecks {
|
|
if !keep {
|
|
a.removeCheckLocked(checkID, persist)
|
|
}
|
|
}
|
|
}
|
|
|
|
return nil
|
|
}
|
|
|
|
// validateService validates an service and its checks, either returning an error or emitting a
|
|
// warning based on the nature of the error.
|
|
func (a *Agent) validateService(service *structs.NodeService, chkTypes []*structs.CheckType) error {
|
|
if service.Service == "" {
|
|
return fmt.Errorf("Service name missing")
|
|
}
|
|
if service.ID == "" && service.Service != "" {
|
|
service.ID = service.Service
|
|
}
|
|
for _, check := range chkTypes {
|
|
if err := check.Validate(); err != nil {
|
|
return fmt.Errorf("Check is not valid: %v", err)
|
|
}
|
|
}
|
|
|
|
// Set default weights if not specified. This is important as it ensures AE
|
|
// doesn't consider the service different since it has nil weights.
|
|
if service.Weights == nil {
|
|
service.Weights = &structs.Weights{Passing: 1, Warning: 1}
|
|
}
|
|
|
|
// Warn if the service name is incompatible with DNS
|
|
if InvalidDnsRe.MatchString(service.Service) {
|
|
a.logger.Printf("[WARN] agent: Service name %q will not be discoverable "+
|
|
"via DNS due to invalid characters. Valid characters include "+
|
|
"all alpha-numerics and dashes.", service.Service)
|
|
} else if len(service.Service) > MaxDNSLabelLength {
|
|
a.logger.Printf("[WARN] agent: Service name %q will not be discoverable "+
|
|
"via DNS due to it being too long. Valid lengths are between "+
|
|
"1 and 63 bytes.", service.Service)
|
|
}
|
|
|
|
// Warn if any tags are incompatible with DNS
|
|
for _, tag := range service.Tags {
|
|
if InvalidDnsRe.MatchString(tag) {
|
|
a.logger.Printf("[DEBUG] agent: Service tag %q will not be discoverable "+
|
|
"via DNS due to invalid characters. Valid characters include "+
|
|
"all alpha-numerics and dashes.", tag)
|
|
} else if len(tag) > MaxDNSLabelLength {
|
|
a.logger.Printf("[DEBUG] agent: Service tag %q will not be discoverable "+
|
|
"via DNS due to it being too long. Valid lengths are between "+
|
|
"1 and 63 bytes.", tag)
|
|
}
|
|
}
|
|
|
|
return nil
|
|
}
|
|
|
|
// cleanupRegistration is called on registration error to ensure no there are no
|
|
// leftovers after a partial failure
|
|
func (a *Agent) cleanupRegistration(serviceIDs []string, checksIDs []types.CheckID) {
|
|
for _, s := range serviceIDs {
|
|
if err := a.State.RemoveService(s); err != nil {
|
|
a.logger.Printf("[ERR] consul: service registration: cleanup: failed to remove service %s: %s", s, err)
|
|
}
|
|
if err := a.purgeService(s); err != nil {
|
|
a.logger.Printf("[ERR] consul: service registration: cleanup: failed to purge service %s file: %s", s, err)
|
|
}
|
|
if err := a.purgeServiceConfig(s); err != nil {
|
|
a.logger.Printf("[ERR] consul: service registration: cleanup: failed to purge service config %s file: %s", s, err)
|
|
}
|
|
}
|
|
|
|
for _, c := range checksIDs {
|
|
a.cancelCheckMonitors(c)
|
|
if err := a.State.RemoveCheck(c); err != nil {
|
|
a.logger.Printf("[ERR] consul: service registration: cleanup: failed to remove check %s: %s", c, err)
|
|
}
|
|
if err := a.purgeCheck(c); err != nil {
|
|
a.logger.Printf("[ERR] consul: service registration: cleanup: failed to purge check %s file: %s", c, err)
|
|
}
|
|
}
|
|
}
|
|
|
|
// RemoveService is used to remove a service entry.
|
|
// The agent will make a best effort to ensure it is deregistered
|
|
func (a *Agent) RemoveService(serviceID string) error {
|
|
return a.removeService(serviceID, true)
|
|
}
|
|
|
|
func (a *Agent) removeService(serviceID string, persist bool) error {
|
|
a.stateLock.Lock()
|
|
defer a.stateLock.Unlock()
|
|
return a.removeServiceLocked(serviceID, persist)
|
|
}
|
|
|
|
// removeServiceLocked is used to remove a service entry.
|
|
// The agent will make a best effort to ensure it is deregistered
|
|
func (a *Agent) removeServiceLocked(serviceID string, persist bool) error {
|
|
// Validate ServiceID
|
|
if serviceID == "" {
|
|
return fmt.Errorf("ServiceID missing")
|
|
}
|
|
|
|
// Shut down the config watch in the service manager if enabled.
|
|
if a.config.EnableCentralServiceConfig {
|
|
a.serviceManager.RemoveService(serviceID)
|
|
}
|
|
|
|
// Reset the HTTP check targets if they were exposed through a proxy
|
|
// If this is not a proxy or checks were not exposed then this is a no-op
|
|
svc := a.State.Service(serviceID)
|
|
|
|
if svc != nil {
|
|
a.resetExposedChecks(svc.Proxy.DestinationServiceID)
|
|
}
|
|
|
|
checks := a.State.Checks()
|
|
var checkIDs []types.CheckID
|
|
for id, check := range checks {
|
|
if check.ServiceID != serviceID {
|
|
continue
|
|
}
|
|
checkIDs = append(checkIDs, id)
|
|
}
|
|
|
|
// Remove service immediately
|
|
if err := a.State.RemoveServiceWithChecks(serviceID, checkIDs); err != nil {
|
|
a.logger.Printf("[WARN] agent: Failed to deregister service %q: %s", serviceID, err)
|
|
return nil
|
|
}
|
|
|
|
// Remove the service from the data dir
|
|
if persist {
|
|
if err := a.purgeService(serviceID); err != nil {
|
|
return err
|
|
}
|
|
if err := a.purgeServiceConfig(serviceID); err != nil {
|
|
return err
|
|
}
|
|
}
|
|
|
|
// Deregister any associated health checks
|
|
for checkID, check := range checks {
|
|
if check.ServiceID != serviceID {
|
|
continue
|
|
}
|
|
if err := a.removeCheckLocked(checkID, persist); err != nil {
|
|
return err
|
|
}
|
|
}
|
|
|
|
a.logger.Printf("[DEBUG] agent: removed service %q", serviceID)
|
|
|
|
// If any Sidecar services exist for the removed service ID, remove them too.
|
|
if sidecar := a.State.Service(a.sidecarServiceID(serviceID)); sidecar != nil {
|
|
// Double check that it's not just an ID collision and we actually added
|
|
// this from a sidecar.
|
|
if sidecar.LocallyRegisteredAsSidecar {
|
|
// Remove it!
|
|
err := a.removeServiceLocked(a.sidecarServiceID(serviceID), persist)
|
|
if err != nil {
|
|
return err
|
|
}
|
|
}
|
|
}
|
|
|
|
return nil
|
|
}
|
|
|
|
// AddCheck is used to add a health check to the agent.
|
|
// This entry is persistent and the agent will make a best effort to
|
|
// ensure it is registered. The Check may include a CheckType which
|
|
// is used to automatically update the check status
|
|
func (a *Agent) AddCheck(check *structs.HealthCheck, chkType *structs.CheckType, persist bool, token string, source configSource) error {
|
|
a.stateLock.Lock()
|
|
defer a.stateLock.Unlock()
|
|
return a.addCheckLocked(check, chkType, persist, token, source)
|
|
}
|
|
|
|
func (a *Agent) addCheckLocked(check *structs.HealthCheck, chkType *structs.CheckType, persist bool, token string, source configSource) error {
|
|
var service *structs.NodeService
|
|
|
|
if check.ServiceID != "" {
|
|
service = a.State.Service(check.ServiceID)
|
|
if service == nil {
|
|
return fmt.Errorf("ServiceID %q does not exist", check.ServiceID)
|
|
}
|
|
}
|
|
|
|
// snapshot the current state of the health check to avoid potential flapping
|
|
existing := a.State.Check(check.CheckID)
|
|
defer func() {
|
|
if existing != nil {
|
|
a.State.UpdateCheck(check.CheckID, existing.Status, existing.Output)
|
|
}
|
|
}()
|
|
|
|
err := a.addCheck(check, chkType, service, persist, token, source)
|
|
if err != nil {
|
|
a.State.RemoveCheck(check.CheckID)
|
|
return err
|
|
}
|
|
|
|
// Add to the local state for anti-entropy
|
|
err = a.State.AddCheck(check, token)
|
|
if err != nil {
|
|
return err
|
|
}
|
|
|
|
// Persist the check
|
|
if persist && a.config.DataDir != "" {
|
|
return a.persistCheck(check, chkType, source)
|
|
}
|
|
|
|
return nil
|
|
}
|
|
|
|
func (a *Agent) addCheck(check *structs.HealthCheck, chkType *structs.CheckType, service *structs.NodeService, persist bool, token string, source configSource) error {
|
|
if check.CheckID == "" {
|
|
return fmt.Errorf("CheckID missing")
|
|
}
|
|
|
|
if chkType != nil {
|
|
if err := chkType.Validate(); err != nil {
|
|
return fmt.Errorf("Check is not valid: %v", err)
|
|
}
|
|
|
|
if chkType.IsScript() {
|
|
if source == ConfigSourceLocal && !a.config.EnableLocalScriptChecks {
|
|
return fmt.Errorf("Scripts are disabled on this agent; to enable, configure 'enable_script_checks' or 'enable_local_script_checks' to true")
|
|
}
|
|
|
|
if source == ConfigSourceRemote && !a.config.EnableRemoteScriptChecks {
|
|
return fmt.Errorf("Scripts are disabled on this agent from remote calls; to enable, configure 'enable_script_checks' to true")
|
|
}
|
|
}
|
|
}
|
|
|
|
if check.ServiceID != "" {
|
|
check.ServiceName = service.Service
|
|
check.ServiceTags = service.Tags
|
|
}
|
|
|
|
// Check if already registered
|
|
if chkType != nil {
|
|
maxOutputSize := a.config.CheckOutputMaxSize
|
|
if maxOutputSize == 0 {
|
|
maxOutputSize = checks.DefaultBufSize
|
|
}
|
|
if chkType.OutputMaxSize > 0 && maxOutputSize > chkType.OutputMaxSize {
|
|
maxOutputSize = chkType.OutputMaxSize
|
|
}
|
|
|
|
// Get the address of the proxy for this service if it exists
|
|
// Need its config to know whether we should reroute checks to it
|
|
var proxy *structs.NodeService
|
|
if service != nil {
|
|
for _, svc := range a.State.Services() {
|
|
if svc.Proxy.DestinationServiceID == service.ID {
|
|
proxy = svc
|
|
break
|
|
}
|
|
}
|
|
}
|
|
|
|
switch {
|
|
|
|
case chkType.IsTTL():
|
|
if existing, ok := a.checkTTLs[check.CheckID]; ok {
|
|
existing.Stop()
|
|
delete(a.checkTTLs, check.CheckID)
|
|
}
|
|
|
|
ttl := &checks.CheckTTL{
|
|
Notify: a.State,
|
|
CheckID: check.CheckID,
|
|
ServiceID: check.ServiceID,
|
|
TTL: chkType.TTL,
|
|
Logger: a.logger,
|
|
OutputMaxSize: maxOutputSize,
|
|
}
|
|
|
|
// Restore persisted state, if any
|
|
if err := a.loadCheckState(check); err != nil {
|
|
a.logger.Printf("[WARN] agent: failed restoring state for check %q: %s",
|
|
check.CheckID, err)
|
|
}
|
|
|
|
ttl.Start()
|
|
a.checkTTLs[check.CheckID] = ttl
|
|
|
|
case chkType.IsHTTP():
|
|
if existing, ok := a.checkHTTPs[check.CheckID]; ok {
|
|
existing.Stop()
|
|
delete(a.checkHTTPs, check.CheckID)
|
|
}
|
|
if chkType.Interval < checks.MinInterval {
|
|
a.logger.Println(fmt.Sprintf("[WARN] agent: check '%s' has interval below minimum of %v",
|
|
check.CheckID, checks.MinInterval))
|
|
chkType.Interval = checks.MinInterval
|
|
}
|
|
|
|
tlsClientConfig := a.tlsConfigurator.OutgoingTLSConfigForCheck(chkType.TLSSkipVerify)
|
|
|
|
http := &checks.CheckHTTP{
|
|
Notify: a.State,
|
|
CheckID: check.CheckID,
|
|
ServiceID: check.ServiceID,
|
|
HTTP: chkType.HTTP,
|
|
Header: chkType.Header,
|
|
Method: chkType.Method,
|
|
Interval: chkType.Interval,
|
|
Timeout: chkType.Timeout,
|
|
Logger: a.logger,
|
|
OutputMaxSize: maxOutputSize,
|
|
TLSClientConfig: tlsClientConfig,
|
|
}
|
|
|
|
if proxy != nil && proxy.Proxy.Expose.Checks {
|
|
port, err := a.listenerPortLocked(service.ID, string(http.CheckID))
|
|
if err != nil {
|
|
a.logger.Printf("[ERR] agent: error exposing check: %s", err)
|
|
return err
|
|
}
|
|
http.ProxyHTTP = httpInjectAddr(http.HTTP, proxy.Proxy.LocalServiceAddress, port)
|
|
}
|
|
|
|
http.Start()
|
|
a.checkHTTPs[check.CheckID] = http
|
|
|
|
case chkType.IsTCP():
|
|
if existing, ok := a.checkTCPs[check.CheckID]; ok {
|
|
existing.Stop()
|
|
delete(a.checkTCPs, check.CheckID)
|
|
}
|
|
if chkType.Interval < checks.MinInterval {
|
|
a.logger.Println(fmt.Sprintf("[WARN] agent: check '%s' has interval below minimum of %v",
|
|
check.CheckID, checks.MinInterval))
|
|
chkType.Interval = checks.MinInterval
|
|
}
|
|
|
|
tcp := &checks.CheckTCP{
|
|
Notify: a.State,
|
|
CheckID: check.CheckID,
|
|
ServiceID: check.ServiceID,
|
|
TCP: chkType.TCP,
|
|
Interval: chkType.Interval,
|
|
Timeout: chkType.Timeout,
|
|
Logger: a.logger,
|
|
}
|
|
tcp.Start()
|
|
a.checkTCPs[check.CheckID] = tcp
|
|
|
|
case chkType.IsGRPC():
|
|
if existing, ok := a.checkGRPCs[check.CheckID]; ok {
|
|
existing.Stop()
|
|
delete(a.checkGRPCs, check.CheckID)
|
|
}
|
|
if chkType.Interval < checks.MinInterval {
|
|
a.logger.Println(fmt.Sprintf("[WARN] agent: check '%s' has interval below minimum of %v",
|
|
check.CheckID, checks.MinInterval))
|
|
chkType.Interval = checks.MinInterval
|
|
}
|
|
|
|
var tlsClientConfig *tls.Config
|
|
if chkType.GRPCUseTLS {
|
|
tlsClientConfig = a.tlsConfigurator.OutgoingTLSConfigForCheck(chkType.TLSSkipVerify)
|
|
}
|
|
|
|
grpc := &checks.CheckGRPC{
|
|
Notify: a.State,
|
|
CheckID: check.CheckID,
|
|
ServiceID: check.ServiceID,
|
|
GRPC: chkType.GRPC,
|
|
Interval: chkType.Interval,
|
|
Timeout: chkType.Timeout,
|
|
Logger: a.logger,
|
|
TLSClientConfig: tlsClientConfig,
|
|
}
|
|
|
|
if proxy != nil && proxy.Proxy.Expose.Checks {
|
|
port, err := a.listenerPortLocked(service.ID, string(grpc.CheckID))
|
|
if err != nil {
|
|
a.logger.Printf("[ERR] agent: error exposing check: %s", err)
|
|
return err
|
|
}
|
|
grpc.ProxyGRPC = grpcInjectAddr(grpc.GRPC, proxy.Proxy.LocalServiceAddress, port)
|
|
}
|
|
|
|
grpc.Start()
|
|
a.checkGRPCs[check.CheckID] = grpc
|
|
|
|
case chkType.IsDocker():
|
|
if existing, ok := a.checkDockers[check.CheckID]; ok {
|
|
existing.Stop()
|
|
delete(a.checkDockers, check.CheckID)
|
|
}
|
|
if chkType.Interval < checks.MinInterval {
|
|
a.logger.Println(fmt.Sprintf("[WARN] agent: check '%s' has interval below minimum of %v",
|
|
check.CheckID, checks.MinInterval))
|
|
chkType.Interval = checks.MinInterval
|
|
}
|
|
|
|
if a.dockerClient == nil {
|
|
dc, err := checks.NewDockerClient(os.Getenv("DOCKER_HOST"), int64(maxOutputSize))
|
|
if err != nil {
|
|
a.logger.Printf("[ERR] agent: error creating docker client: %s", err)
|
|
return err
|
|
}
|
|
a.logger.Printf("[DEBUG] agent: created docker client for %s", dc.Host())
|
|
a.dockerClient = dc
|
|
}
|
|
|
|
dockerCheck := &checks.CheckDocker{
|
|
Notify: a.State,
|
|
CheckID: check.CheckID,
|
|
ServiceID: check.ServiceID,
|
|
DockerContainerID: chkType.DockerContainerID,
|
|
Shell: chkType.Shell,
|
|
ScriptArgs: chkType.ScriptArgs,
|
|
Interval: chkType.Interval,
|
|
Logger: a.logger,
|
|
Client: a.dockerClient,
|
|
}
|
|
if prev := a.checkDockers[check.CheckID]; prev != nil {
|
|
prev.Stop()
|
|
}
|
|
dockerCheck.Start()
|
|
a.checkDockers[check.CheckID] = dockerCheck
|
|
|
|
case chkType.IsMonitor():
|
|
if existing, ok := a.checkMonitors[check.CheckID]; ok {
|
|
existing.Stop()
|
|
delete(a.checkMonitors, check.CheckID)
|
|
}
|
|
if chkType.Interval < checks.MinInterval {
|
|
a.logger.Printf("[WARN] agent: check '%s' has interval below minimum of %v",
|
|
check.CheckID, checks.MinInterval)
|
|
chkType.Interval = checks.MinInterval
|
|
}
|
|
monitor := &checks.CheckMonitor{
|
|
Notify: a.State,
|
|
CheckID: check.CheckID,
|
|
ServiceID: check.ServiceID,
|
|
ScriptArgs: chkType.ScriptArgs,
|
|
Interval: chkType.Interval,
|
|
Timeout: chkType.Timeout,
|
|
Logger: a.logger,
|
|
OutputMaxSize: maxOutputSize,
|
|
}
|
|
monitor.Start()
|
|
a.checkMonitors[check.CheckID] = monitor
|
|
|
|
case chkType.IsAlias():
|
|
if existing, ok := a.checkAliases[check.CheckID]; ok {
|
|
existing.Stop()
|
|
delete(a.checkAliases, check.CheckID)
|
|
}
|
|
|
|
var rpcReq structs.NodeSpecificRequest
|
|
rpcReq.Datacenter = a.config.Datacenter
|
|
|
|
// The token to set is really important. The behavior below follows
|
|
// the same behavior as anti-entropy: we use the user-specified token
|
|
// if set (either on the service or check definition), otherwise
|
|
// we use the "UserToken" on the agent. This is tested.
|
|
rpcReq.Token = a.tokens.UserToken()
|
|
if token != "" {
|
|
rpcReq.Token = token
|
|
}
|
|
|
|
chkImpl := &checks.CheckAlias{
|
|
Notify: a.State,
|
|
RPC: a.delegate,
|
|
RPCReq: rpcReq,
|
|
CheckID: check.CheckID,
|
|
Node: chkType.AliasNode,
|
|
ServiceID: chkType.AliasService,
|
|
}
|
|
chkImpl.Start()
|
|
a.checkAliases[check.CheckID] = chkImpl
|
|
|
|
default:
|
|
return fmt.Errorf("Check type is not valid")
|
|
}
|
|
|
|
// Notify channel that watches for service state changes
|
|
// This is a non-blocking send to avoid synchronizing on a large number of check updates
|
|
s := a.State.ServiceState(check.ServiceID)
|
|
if s != nil && !s.Deleted {
|
|
select {
|
|
case s.WatchCh <- struct{}{}:
|
|
default:
|
|
}
|
|
}
|
|
|
|
if chkType.DeregisterCriticalServiceAfter > 0 {
|
|
timeout := chkType.DeregisterCriticalServiceAfter
|
|
if timeout < a.config.CheckDeregisterIntervalMin {
|
|
timeout = a.config.CheckDeregisterIntervalMin
|
|
a.logger.Println(fmt.Sprintf("[WARN] agent: check '%s' has deregister interval below minimum of %v",
|
|
check.CheckID, a.config.CheckDeregisterIntervalMin))
|
|
}
|
|
a.checkReapAfter[check.CheckID] = timeout
|
|
} else {
|
|
delete(a.checkReapAfter, check.CheckID)
|
|
}
|
|
}
|
|
|
|
return nil
|
|
}
|
|
|
|
// RemoveCheck is used to remove a health check.
|
|
// The agent will make a best effort to ensure it is deregistered
|
|
func (a *Agent) RemoveCheck(checkID types.CheckID, persist bool) error {
|
|
a.stateLock.Lock()
|
|
defer a.stateLock.Unlock()
|
|
return a.removeCheckLocked(checkID, persist)
|
|
}
|
|
|
|
// removeCheckLocked is used to remove a health check.
|
|
// The agent will make a best effort to ensure it is deregistered
|
|
func (a *Agent) removeCheckLocked(checkID types.CheckID, persist bool) error {
|
|
// Validate CheckID
|
|
if checkID == "" {
|
|
return fmt.Errorf("CheckID missing")
|
|
}
|
|
|
|
// Notify channel that watches for service state changes
|
|
// This is a non-blocking send to avoid synchronizing on a large number of check updates
|
|
var svcID string
|
|
for _, c := range a.State.Checks() {
|
|
if c.CheckID == checkID {
|
|
svcID = c.ServiceID
|
|
break
|
|
}
|
|
}
|
|
s := a.State.ServiceState(svcID)
|
|
if s != nil && !s.Deleted {
|
|
select {
|
|
case s.WatchCh <- struct{}{}:
|
|
default:
|
|
}
|
|
}
|
|
|
|
// Delete port from allocated port set
|
|
// If checks weren't being exposed then this is a no-op
|
|
portKey := listenerPortKey(svcID, string(checkID))
|
|
delete(a.exposedPorts, portKey)
|
|
|
|
a.cancelCheckMonitors(checkID)
|
|
a.State.RemoveCheck(checkID)
|
|
|
|
if persist {
|
|
if err := a.purgeCheck(checkID); err != nil {
|
|
return err
|
|
}
|
|
if err := a.purgeCheckState(checkID); err != nil {
|
|
return err
|
|
}
|
|
}
|
|
|
|
a.logger.Printf("[DEBUG] agent: removed check %q", checkID)
|
|
return nil
|
|
}
|
|
|
|
func (a *Agent) ServiceHTTPBasedChecks(serviceID string) []structs.CheckType {
|
|
a.stateLock.Lock()
|
|
defer a.stateLock.Unlock()
|
|
|
|
var chkTypes = make([]structs.CheckType, 0)
|
|
for _, c := range a.checkHTTPs {
|
|
if c.ServiceID == serviceID {
|
|
chkTypes = append(chkTypes, c.CheckType())
|
|
}
|
|
}
|
|
for _, c := range a.checkGRPCs {
|
|
if c.ServiceID == serviceID {
|
|
chkTypes = append(chkTypes, c.CheckType())
|
|
}
|
|
}
|
|
return chkTypes
|
|
}
|
|
|
|
func (a *Agent) AdvertiseAddrLAN() string {
|
|
return a.config.AdvertiseAddrLAN.String()
|
|
}
|
|
|
|
// resolveProxyCheckAddress returns the best address to use for a TCP check of
|
|
// the proxy's public listener. It expects the input to already have default
|
|
// values populated by applyProxyConfigDefaults. It may return an empty string
|
|
// indicating that the TCP check should not be created at all.
|
|
//
|
|
// By default this uses the proxy's bind address which in turn defaults to the
|
|
// agent's bind address. If the proxy bind address ends up being 0.0.0.0 we have
|
|
// to assume the agent can dial it over loopback which is usually true.
|
|
//
|
|
// In some topologies such as proxy being in a different container, the IP the
|
|
// agent used to dial proxy over a local bridge might not be the same as the
|
|
// container's public routable IP address so we allow a manual override of the
|
|
// check address in config "tcp_check_address" too.
|
|
//
|
|
// Finally the TCP check can be disabled by another manual override
|
|
// "disable_tcp_check" in cases where the agent will never be able to dial the
|
|
// proxy directly for some reason.
|
|
func (a *Agent) resolveProxyCheckAddress(proxyCfg map[string]interface{}) string {
|
|
// If user disabled the check return empty string
|
|
if disable, ok := proxyCfg["disable_tcp_check"].(bool); ok && disable {
|
|
return ""
|
|
}
|
|
|
|
// If user specified a custom one, use that
|
|
if chkAddr, ok := proxyCfg["tcp_check_address"].(string); ok && chkAddr != "" {
|
|
return chkAddr
|
|
}
|
|
|
|
// If we have a bind address and its diallable, use that
|
|
if bindAddr, ok := proxyCfg["bind_address"].(string); ok &&
|
|
bindAddr != "" && bindAddr != "0.0.0.0" && bindAddr != "[::]" {
|
|
return bindAddr
|
|
}
|
|
|
|
// Default to localhost
|
|
return "127.0.0.1"
|
|
}
|
|
|
|
func (a *Agent) cancelCheckMonitors(checkID types.CheckID) {
|
|
// Stop any monitors
|
|
delete(a.checkReapAfter, checkID)
|
|
if check, ok := a.checkMonitors[checkID]; ok {
|
|
check.Stop()
|
|
delete(a.checkMonitors, checkID)
|
|
}
|
|
if check, ok := a.checkHTTPs[checkID]; ok {
|
|
check.Stop()
|
|
delete(a.checkHTTPs, checkID)
|
|
}
|
|
if check, ok := a.checkTCPs[checkID]; ok {
|
|
check.Stop()
|
|
delete(a.checkTCPs, checkID)
|
|
}
|
|
if check, ok := a.checkGRPCs[checkID]; ok {
|
|
check.Stop()
|
|
delete(a.checkGRPCs, checkID)
|
|
}
|
|
if check, ok := a.checkTTLs[checkID]; ok {
|
|
check.Stop()
|
|
delete(a.checkTTLs, checkID)
|
|
}
|
|
if check, ok := a.checkDockers[checkID]; ok {
|
|
check.Stop()
|
|
delete(a.checkDockers, checkID)
|
|
}
|
|
}
|
|
|
|
// updateTTLCheck is used to update the status of a TTL check via the Agent API.
|
|
func (a *Agent) updateTTLCheck(checkID types.CheckID, status, output string) error {
|
|
a.stateLock.Lock()
|
|
defer a.stateLock.Unlock()
|
|
|
|
// Grab the TTL check.
|
|
check, ok := a.checkTTLs[checkID]
|
|
if !ok {
|
|
return fmt.Errorf("CheckID %q does not have associated TTL", checkID)
|
|
}
|
|
|
|
// Set the status through CheckTTL to reset the TTL.
|
|
outputTruncated := check.SetStatus(status, output)
|
|
|
|
// We don't write any files in dev mode so bail here.
|
|
if a.config.DataDir == "" {
|
|
return nil
|
|
}
|
|
|
|
// Persist the state so the TTL check can come up in a good state after
|
|
// an agent restart, especially with long TTL values.
|
|
if err := a.persistCheckState(check, status, outputTruncated); err != nil {
|
|
return fmt.Errorf("failed persisting state for check %q: %s", checkID, err)
|
|
}
|
|
|
|
return nil
|
|
}
|
|
|
|
// persistCheckState is used to record the check status into the data dir.
|
|
// This allows the state to be restored on a later agent start. Currently
|
|
// only useful for TTL based checks.
|
|
func (a *Agent) persistCheckState(check *checks.CheckTTL, status, output string) error {
|
|
// Create the persisted state
|
|
state := persistedCheckState{
|
|
CheckID: check.CheckID,
|
|
Status: status,
|
|
Output: output,
|
|
Expires: time.Now().Add(check.TTL).Unix(),
|
|
}
|
|
|
|
// Encode the state
|
|
buf, err := json.Marshal(state)
|
|
if err != nil {
|
|
return err
|
|
}
|
|
|
|
// Create the state dir if it doesn't exist
|
|
dir := filepath.Join(a.config.DataDir, checkStateDir)
|
|
if err := os.MkdirAll(dir, 0700); err != nil {
|
|
return fmt.Errorf("failed creating check state dir %q: %s", dir, err)
|
|
}
|
|
|
|
// Write the state to the file
|
|
file := filepath.Join(dir, checkIDHash(check.CheckID))
|
|
|
|
// Create temp file in same dir, to make more likely atomic
|
|
tempFile := file + ".tmp"
|
|
|
|
// persistCheckState is called frequently, so don't use writeFileAtomic to avoid calling fsync here
|
|
if err := ioutil.WriteFile(tempFile, buf, 0600); err != nil {
|
|
return fmt.Errorf("failed writing temp file %q: %s", tempFile, err)
|
|
}
|
|
if err := os.Rename(tempFile, file); err != nil {
|
|
return fmt.Errorf("failed to rename temp file from %q to %q: %s", tempFile, file, err)
|
|
}
|
|
|
|
return nil
|
|
}
|
|
|
|
// loadCheckState is used to restore the persisted state of a check.
|
|
func (a *Agent) loadCheckState(check *structs.HealthCheck) error {
|
|
// Try to read the persisted state for this check
|
|
file := filepath.Join(a.config.DataDir, checkStateDir, checkIDHash(check.CheckID))
|
|
buf, err := ioutil.ReadFile(file)
|
|
if err != nil {
|
|
if os.IsNotExist(err) {
|
|
return nil
|
|
}
|
|
return fmt.Errorf("failed reading file %q: %s", file, err)
|
|
}
|
|
|
|
// Decode the state data
|
|
var p persistedCheckState
|
|
if err := json.Unmarshal(buf, &p); err != nil {
|
|
a.logger.Printf("[ERR] agent: failed decoding check state: %s", err)
|
|
return a.purgeCheckState(check.CheckID)
|
|
}
|
|
|
|
// Check if the state has expired
|
|
if time.Now().Unix() >= p.Expires {
|
|
a.logger.Printf("[DEBUG] agent: check state expired for %q, not restoring", check.CheckID)
|
|
return a.purgeCheckState(check.CheckID)
|
|
}
|
|
|
|
// Restore the fields from the state
|
|
check.Output = p.Output
|
|
check.Status = p.Status
|
|
return nil
|
|
}
|
|
|
|
// purgeCheckState is used to purge the state of a check from the data dir
|
|
func (a *Agent) purgeCheckState(checkID types.CheckID) error {
|
|
file := filepath.Join(a.config.DataDir, checkStateDir, checkIDHash(checkID))
|
|
err := os.Remove(file)
|
|
if os.IsNotExist(err) {
|
|
return nil
|
|
}
|
|
return err
|
|
}
|
|
|
|
func (a *Agent) GossipEncrypted() bool {
|
|
return a.delegate.Encrypted()
|
|
}
|
|
|
|
// Stats is used to get various debugging state from the sub-systems
|
|
func (a *Agent) Stats() map[string]map[string]string {
|
|
stats := a.delegate.Stats()
|
|
stats["agent"] = map[string]string{
|
|
"check_monitors": strconv.Itoa(len(a.checkMonitors)),
|
|
"check_ttls": strconv.Itoa(len(a.checkTTLs)),
|
|
}
|
|
for k, v := range a.State.Stats() {
|
|
stats["agent"][k] = v
|
|
}
|
|
|
|
revision := a.config.Revision
|
|
if len(revision) > 8 {
|
|
revision = revision[:8]
|
|
}
|
|
stats["build"] = map[string]string{
|
|
"revision": revision,
|
|
"version": a.config.Version,
|
|
"prerelease": a.config.VersionPrerelease,
|
|
}
|
|
return stats
|
|
}
|
|
|
|
// storePid is used to write out our PID to a file if necessary
|
|
func (a *Agent) storePid() error {
|
|
// Quit fast if no pidfile
|
|
pidPath := a.config.PidFile
|
|
if pidPath == "" {
|
|
return nil
|
|
}
|
|
|
|
// Open the PID file
|
|
pidFile, err := os.OpenFile(pidPath, os.O_CREATE|os.O_WRONLY|os.O_TRUNC, 0666)
|
|
if err != nil {
|
|
return fmt.Errorf("Could not open pid file: %v", err)
|
|
}
|
|
defer pidFile.Close()
|
|
|
|
// Write out the PID
|
|
pid := os.Getpid()
|
|
_, err = pidFile.WriteString(fmt.Sprintf("%d", pid))
|
|
if err != nil {
|
|
return fmt.Errorf("Could not write to pid file: %s", err)
|
|
}
|
|
return nil
|
|
}
|
|
|
|
// deletePid is used to delete our PID on exit
|
|
func (a *Agent) deletePid() error {
|
|
// Quit fast if no pidfile
|
|
pidPath := a.config.PidFile
|
|
if pidPath == "" {
|
|
return nil
|
|
}
|
|
|
|
stat, err := os.Stat(pidPath)
|
|
if err != nil {
|
|
return fmt.Errorf("Could not remove pid file: %s", err)
|
|
}
|
|
|
|
if stat.IsDir() {
|
|
return fmt.Errorf("Specified pid file path is directory")
|
|
}
|
|
|
|
err = os.Remove(pidPath)
|
|
if err != nil {
|
|
return fmt.Errorf("Could not remove pid file: %s", err)
|
|
}
|
|
return nil
|
|
}
|
|
|
|
// loadServices will load service definitions from configuration and persisted
|
|
// definitions on disk, and load them into the local agent.
|
|
func (a *Agent) loadServices(conf *config.RuntimeConfig) error {
|
|
// Load any persisted service configs so we can feed those into the initial
|
|
// registrations below.
|
|
persistedServiceConfigs, err := a.readPersistedServiceConfigs()
|
|
if err != nil {
|
|
return err
|
|
}
|
|
|
|
// Register the services from config
|
|
for _, service := range conf.Services {
|
|
ns := service.NodeService()
|
|
chkTypes, err := service.CheckTypes()
|
|
if err != nil {
|
|
return fmt.Errorf("Failed to validate checks for service %q: %v", service.Name, err)
|
|
}
|
|
|
|
// Grab and validate sidecar if there is one too
|
|
sidecar, sidecarChecks, sidecarToken, err := a.sidecarServiceFromNodeService(ns, service.Token)
|
|
if err != nil {
|
|
return fmt.Errorf("Failed to validate sidecar for service %q: %v", service.Name, err)
|
|
}
|
|
|
|
// Remove sidecar from NodeService now it's done it's job it's just a config
|
|
// syntax sugar and shouldn't be persisted in local or server state.
|
|
ns.Connect.SidecarService = nil
|
|
|
|
serviceID := defaultIfEmpty(ns.ID, ns.Service)
|
|
err = a.addServiceLocked(&addServiceRequest{
|
|
service: ns,
|
|
chkTypes: chkTypes,
|
|
previousDefaults: persistedServiceConfigs[serviceID],
|
|
waitForCentralConfig: false, // exclusively use cached values
|
|
persist: false, // don't rewrite the file with the same data we just read
|
|
persistServiceConfig: false, // don't rewrite the file with the same data we just read
|
|
token: service.Token,
|
|
replaceExistingChecks: false, // do default behavior
|
|
source: ConfigSourceLocal,
|
|
})
|
|
if err != nil {
|
|
return fmt.Errorf("Failed to register service %q: %v", service.Name, err)
|
|
}
|
|
|
|
// If there is a sidecar service, register that too.
|
|
if sidecar != nil {
|
|
sidecarServiceID := defaultIfEmpty(sidecar.ID, sidecar.Service)
|
|
err = a.addServiceLocked(&addServiceRequest{
|
|
service: sidecar,
|
|
chkTypes: sidecarChecks,
|
|
previousDefaults: persistedServiceConfigs[sidecarServiceID],
|
|
waitForCentralConfig: false, // exclusively use cached values
|
|
persist: false, // don't rewrite the file with the same data we just read
|
|
persistServiceConfig: false, // don't rewrite the file with the same data we just read
|
|
token: sidecarToken,
|
|
replaceExistingChecks: false, // do default behavior
|
|
source: ConfigSourceLocal,
|
|
})
|
|
if err != nil {
|
|
return fmt.Errorf("Failed to register sidecar for service %q: %v", service.Name, err)
|
|
}
|
|
}
|
|
}
|
|
|
|
// Load any persisted services
|
|
svcDir := filepath.Join(a.config.DataDir, servicesDir)
|
|
files, err := ioutil.ReadDir(svcDir)
|
|
if err != nil {
|
|
if os.IsNotExist(err) {
|
|
return nil
|
|
}
|
|
return fmt.Errorf("Failed reading services dir %q: %s", svcDir, err)
|
|
}
|
|
for _, fi := range files {
|
|
// Skip all dirs
|
|
if fi.IsDir() {
|
|
continue
|
|
}
|
|
|
|
// Skip all partially written temporary files
|
|
if strings.HasSuffix(fi.Name(), "tmp") {
|
|
a.logger.Printf("[WARN] agent: Ignoring temporary service file %v", fi.Name())
|
|
continue
|
|
}
|
|
|
|
// Read the contents into a buffer
|
|
file := filepath.Join(svcDir, fi.Name())
|
|
buf, err := ioutil.ReadFile(file)
|
|
if err != nil {
|
|
return fmt.Errorf("failed reading service file %q: %s", file, err)
|
|
}
|
|
|
|
// Try decoding the service definition
|
|
var p persistedService
|
|
if err := json.Unmarshal(buf, &p); err != nil {
|
|
// Backwards-compatibility for pre-0.5.1 persisted services
|
|
if err := json.Unmarshal(buf, &p.Service); err != nil {
|
|
a.logger.Printf("[ERR] agent: Failed decoding service file %q: %s", file, err)
|
|
continue
|
|
}
|
|
}
|
|
serviceID := p.Service.ID
|
|
|
|
source, ok := ConfigSourceFromName(p.Source)
|
|
if !ok {
|
|
a.logger.Printf("[WARN] agent: service %q exists with invalid source %q, purging", serviceID, p.Source)
|
|
if err := a.purgeService(serviceID); err != nil {
|
|
return fmt.Errorf("failed purging service %q: %s", serviceID, err)
|
|
}
|
|
if err := a.purgeServiceConfig(serviceID); err != nil {
|
|
return fmt.Errorf("failed purging service config %q: %s", serviceID, err)
|
|
}
|
|
continue
|
|
}
|
|
|
|
if a.State.Service(serviceID) != nil {
|
|
// Purge previously persisted service. This allows config to be
|
|
// preferred over services persisted from the API.
|
|
a.logger.Printf("[DEBUG] agent: service %q exists, not restoring from %q",
|
|
serviceID, file)
|
|
if err := a.purgeService(serviceID); err != nil {
|
|
return fmt.Errorf("failed purging service %q: %s", serviceID, err)
|
|
}
|
|
if err := a.purgeServiceConfig(serviceID); err != nil {
|
|
return fmt.Errorf("failed purging service config %q: %s", serviceID, err)
|
|
}
|
|
} else {
|
|
a.logger.Printf("[DEBUG] agent: restored service definition %q from %q",
|
|
serviceID, file)
|
|
err = a.addServiceLocked(&addServiceRequest{
|
|
service: p.Service,
|
|
chkTypes: nil,
|
|
previousDefaults: persistedServiceConfigs[serviceID],
|
|
waitForCentralConfig: false, // exclusively use cached values
|
|
persist: false, // don't rewrite the file with the same data we just read
|
|
persistServiceConfig: false, // don't rewrite the file with the same data we just read
|
|
token: p.Token,
|
|
replaceExistingChecks: false, // do default behavior
|
|
source: source,
|
|
},
|
|
)
|
|
if err != nil {
|
|
return fmt.Errorf("failed adding service %q: %s", serviceID, err)
|
|
}
|
|
}
|
|
}
|
|
|
|
for serviceID, _ := range persistedServiceConfigs {
|
|
if a.State.Service(serviceID) == nil {
|
|
// This can be cleaned up now.
|
|
if err := a.purgeServiceConfig(serviceID); err != nil {
|
|
return fmt.Errorf("failed purging service config %q: %s", serviceID, err)
|
|
}
|
|
}
|
|
}
|
|
|
|
return nil
|
|
}
|
|
|
|
// unloadServices will deregister all services.
|
|
func (a *Agent) unloadServices() error {
|
|
for id := range a.State.Services() {
|
|
if err := a.removeServiceLocked(id, false); err != nil {
|
|
return fmt.Errorf("Failed deregistering service '%s': %v", id, err)
|
|
}
|
|
}
|
|
return nil
|
|
}
|
|
|
|
// loadChecks loads check definitions and/or persisted check definitions from
|
|
// disk and re-registers them with the local agent.
|
|
func (a *Agent) loadChecks(conf *config.RuntimeConfig, snap map[types.CheckID]*structs.HealthCheck) error {
|
|
// Register the checks from config
|
|
for _, check := range conf.Checks {
|
|
health := check.HealthCheck(conf.NodeName)
|
|
|
|
// Restore the fields from the snapshot.
|
|
if prev, ok := snap[health.CheckID]; ok {
|
|
health.Output = prev.Output
|
|
health.Status = prev.Status
|
|
}
|
|
|
|
chkType := check.CheckType()
|
|
if err := a.addCheckLocked(health, chkType, false, check.Token, ConfigSourceLocal); err != nil {
|
|
return fmt.Errorf("Failed to register check '%s': %v %v", check.Name, err, check)
|
|
}
|
|
}
|
|
|
|
// Load any persisted checks
|
|
checkDir := filepath.Join(a.config.DataDir, checksDir)
|
|
files, err := ioutil.ReadDir(checkDir)
|
|
if err != nil {
|
|
if os.IsNotExist(err) {
|
|
return nil
|
|
}
|
|
return fmt.Errorf("Failed reading checks dir %q: %s", checkDir, err)
|
|
}
|
|
for _, fi := range files {
|
|
// Ignore dirs - we only care about the check definition files
|
|
if fi.IsDir() {
|
|
continue
|
|
}
|
|
|
|
// Read the contents into a buffer
|
|
file := filepath.Join(checkDir, fi.Name())
|
|
buf, err := ioutil.ReadFile(file)
|
|
if err != nil {
|
|
return fmt.Errorf("failed reading check file %q: %s", file, err)
|
|
}
|
|
|
|
// Decode the check
|
|
var p persistedCheck
|
|
if err := json.Unmarshal(buf, &p); err != nil {
|
|
a.logger.Printf("[ERR] agent: Failed decoding check file %q: %s", file, err)
|
|
continue
|
|
}
|
|
checkID := p.Check.CheckID
|
|
|
|
source, ok := ConfigSourceFromName(p.Source)
|
|
if !ok {
|
|
a.logger.Printf("[WARN] agent: check %q exists with invalid source %q, purging", checkID, p.Source)
|
|
if err := a.purgeCheck(checkID); err != nil {
|
|
return fmt.Errorf("failed purging check %q: %s", checkID, err)
|
|
}
|
|
continue
|
|
}
|
|
|
|
if a.State.Check(checkID) != nil {
|
|
// Purge previously persisted check. This allows config to be
|
|
// preferred over persisted checks from the API.
|
|
a.logger.Printf("[DEBUG] agent: check %q exists, not restoring from %q",
|
|
checkID, file)
|
|
if err := a.purgeCheck(checkID); err != nil {
|
|
return fmt.Errorf("Failed purging check %q: %s", checkID, err)
|
|
}
|
|
} else {
|
|
// Default check to critical to avoid placing potentially unhealthy
|
|
// services into the active pool
|
|
p.Check.Status = api.HealthCritical
|
|
|
|
// Restore the fields from the snapshot.
|
|
if prev, ok := snap[p.Check.CheckID]; ok {
|
|
p.Check.Output = prev.Output
|
|
p.Check.Status = prev.Status
|
|
}
|
|
|
|
if err := a.addCheckLocked(p.Check, p.ChkType, false, p.Token, source); err != nil {
|
|
// Purge the check if it is unable to be restored.
|
|
a.logger.Printf("[WARN] agent: Failed to restore check %q: %s",
|
|
checkID, err)
|
|
if err := a.purgeCheck(checkID); err != nil {
|
|
return fmt.Errorf("Failed purging check %q: %s", checkID, err)
|
|
}
|
|
}
|
|
a.logger.Printf("[DEBUG] agent: restored health check %q from %q",
|
|
p.Check.CheckID, file)
|
|
}
|
|
}
|
|
|
|
return nil
|
|
}
|
|
|
|
// unloadChecks will deregister all checks known to the local agent.
|
|
func (a *Agent) unloadChecks() error {
|
|
for id := range a.State.Checks() {
|
|
if err := a.removeCheckLocked(id, false); err != nil {
|
|
return fmt.Errorf("Failed deregistering check '%s': %s", id, err)
|
|
}
|
|
}
|
|
return nil
|
|
}
|
|
|
|
type persistedTokens struct {
|
|
Replication string `json:"replication,omitempty"`
|
|
AgentMaster string `json:"agent_master,omitempty"`
|
|
Default string `json:"default,omitempty"`
|
|
Agent string `json:"agent,omitempty"`
|
|
}
|
|
|
|
func (a *Agent) getPersistedTokens() (*persistedTokens, error) {
|
|
persistedTokens := &persistedTokens{}
|
|
if !a.config.ACLEnableTokenPersistence {
|
|
return persistedTokens, nil
|
|
}
|
|
|
|
a.persistedTokensLock.RLock()
|
|
defer a.persistedTokensLock.RUnlock()
|
|
|
|
tokensFullPath := filepath.Join(a.config.DataDir, tokensPath)
|
|
|
|
buf, err := ioutil.ReadFile(tokensFullPath)
|
|
if err != nil {
|
|
if os.IsNotExist(err) {
|
|
// non-existence is not an error we care about
|
|
return persistedTokens, nil
|
|
}
|
|
return persistedTokens, fmt.Errorf("failed reading tokens file %q: %s", tokensFullPath, err)
|
|
}
|
|
|
|
if err := json.Unmarshal(buf, persistedTokens); err != nil {
|
|
return persistedTokens, fmt.Errorf("failed to decode tokens file %q: %s", tokensFullPath, err)
|
|
}
|
|
|
|
return persistedTokens, nil
|
|
}
|
|
|
|
func (a *Agent) loadTokens(conf *config.RuntimeConfig) error {
|
|
persistedTokens, persistenceErr := a.getPersistedTokens()
|
|
|
|
if persistenceErr != nil {
|
|
a.logger.Printf("[WARN] unable to load persisted tokens: %v", persistenceErr)
|
|
}
|
|
|
|
if persistedTokens.Default != "" {
|
|
a.tokens.UpdateUserToken(persistedTokens.Default, token.TokenSourceAPI)
|
|
|
|
if conf.ACLToken != "" {
|
|
a.logger.Printf("[WARN] \"default\" token present in both the configuration and persisted token store, using the persisted token")
|
|
}
|
|
} else {
|
|
a.tokens.UpdateUserToken(conf.ACLToken, token.TokenSourceConfig)
|
|
}
|
|
|
|
if persistedTokens.Agent != "" {
|
|
a.tokens.UpdateAgentToken(persistedTokens.Agent, token.TokenSourceAPI)
|
|
|
|
if conf.ACLAgentToken != "" {
|
|
a.logger.Printf("[WARN] \"agent\" token present in both the configuration and persisted token store, using the persisted token")
|
|
}
|
|
} else {
|
|
a.tokens.UpdateAgentToken(conf.ACLAgentToken, token.TokenSourceConfig)
|
|
}
|
|
|
|
if persistedTokens.AgentMaster != "" {
|
|
a.tokens.UpdateAgentMasterToken(persistedTokens.AgentMaster, token.TokenSourceAPI)
|
|
|
|
if conf.ACLAgentMasterToken != "" {
|
|
a.logger.Printf("[WARN] \"agent_master\" token present in both the configuration and persisted token store, using the persisted token")
|
|
}
|
|
} else {
|
|
a.tokens.UpdateAgentMasterToken(conf.ACLAgentMasterToken, token.TokenSourceConfig)
|
|
}
|
|
|
|
if persistedTokens.Replication != "" {
|
|
a.tokens.UpdateReplicationToken(persistedTokens.Replication, token.TokenSourceAPI)
|
|
|
|
if conf.ACLReplicationToken != "" {
|
|
a.logger.Printf("[WARN] \"replication\" token present in both the configuration and persisted token store, using the persisted token")
|
|
}
|
|
} else {
|
|
a.tokens.UpdateReplicationToken(conf.ACLReplicationToken, token.TokenSourceConfig)
|
|
}
|
|
|
|
return persistenceErr
|
|
}
|
|
|
|
// snapshotCheckState is used to snapshot the current state of the health
|
|
// checks. This is done before we reload our checks, so that we can properly
|
|
// restore into the same state.
|
|
func (a *Agent) snapshotCheckState() map[types.CheckID]*structs.HealthCheck {
|
|
return a.State.Checks()
|
|
}
|
|
|
|
// loadMetadata loads node metadata fields from the agent config and
|
|
// updates them on the local agent.
|
|
func (a *Agent) loadMetadata(conf *config.RuntimeConfig) error {
|
|
meta := map[string]string{}
|
|
for k, v := range conf.NodeMeta {
|
|
meta[k] = v
|
|
}
|
|
meta[structs.MetaSegmentKey] = conf.SegmentName
|
|
return a.State.LoadMetadata(meta)
|
|
}
|
|
|
|
// unloadMetadata resets the local metadata state
|
|
func (a *Agent) unloadMetadata() {
|
|
a.State.UnloadMetadata()
|
|
}
|
|
|
|
// serviceMaintCheckID returns the ID of a given service's maintenance check
|
|
func serviceMaintCheckID(serviceID string) types.CheckID {
|
|
return types.CheckID(structs.ServiceMaintPrefix + serviceID)
|
|
}
|
|
|
|
// EnableServiceMaintenance will register a false health check against the given
|
|
// service ID with critical status. This will exclude the service from queries.
|
|
func (a *Agent) EnableServiceMaintenance(serviceID, reason, token string) error {
|
|
service, ok := a.State.Services()[serviceID]
|
|
if !ok {
|
|
return fmt.Errorf("No service registered with ID %q", serviceID)
|
|
}
|
|
|
|
// Check if maintenance mode is not already enabled
|
|
checkID := serviceMaintCheckID(serviceID)
|
|
if _, ok := a.State.Checks()[checkID]; ok {
|
|
return nil
|
|
}
|
|
|
|
// Use default notes if no reason provided
|
|
if reason == "" {
|
|
reason = defaultServiceMaintReason
|
|
}
|
|
|
|
// Create and register the critical health check
|
|
check := &structs.HealthCheck{
|
|
Node: a.config.NodeName,
|
|
CheckID: checkID,
|
|
Name: "Service Maintenance Mode",
|
|
Notes: reason,
|
|
ServiceID: service.ID,
|
|
ServiceName: service.Service,
|
|
Status: api.HealthCritical,
|
|
}
|
|
a.AddCheck(check, nil, true, token, ConfigSourceLocal)
|
|
a.logger.Printf("[INFO] agent: Service %q entered maintenance mode", serviceID)
|
|
|
|
return nil
|
|
}
|
|
|
|
// DisableServiceMaintenance will deregister the fake maintenance mode check
|
|
// if the service has been marked as in maintenance.
|
|
func (a *Agent) DisableServiceMaintenance(serviceID string) error {
|
|
if _, ok := a.State.Services()[serviceID]; !ok {
|
|
return fmt.Errorf("No service registered with ID %q", serviceID)
|
|
}
|
|
|
|
// Check if maintenance mode is enabled
|
|
checkID := serviceMaintCheckID(serviceID)
|
|
if _, ok := a.State.Checks()[checkID]; !ok {
|
|
return nil
|
|
}
|
|
|
|
// Deregister the maintenance check
|
|
a.RemoveCheck(checkID, true)
|
|
a.logger.Printf("[INFO] agent: Service %q left maintenance mode", serviceID)
|
|
|
|
return nil
|
|
}
|
|
|
|
// EnableNodeMaintenance places a node into maintenance mode.
|
|
func (a *Agent) EnableNodeMaintenance(reason, token string) {
|
|
// Ensure node maintenance is not already enabled
|
|
if _, ok := a.State.Checks()[structs.NodeMaint]; ok {
|
|
return
|
|
}
|
|
|
|
// Use a default notes value
|
|
if reason == "" {
|
|
reason = defaultNodeMaintReason
|
|
}
|
|
|
|
// Create and register the node maintenance check
|
|
check := &structs.HealthCheck{
|
|
Node: a.config.NodeName,
|
|
CheckID: structs.NodeMaint,
|
|
Name: "Node Maintenance Mode",
|
|
Notes: reason,
|
|
Status: api.HealthCritical,
|
|
}
|
|
a.AddCheck(check, nil, true, token, ConfigSourceLocal)
|
|
a.logger.Printf("[INFO] agent: Node entered maintenance mode")
|
|
}
|
|
|
|
// DisableNodeMaintenance removes a node from maintenance mode
|
|
func (a *Agent) DisableNodeMaintenance() {
|
|
if _, ok := a.State.Checks()[structs.NodeMaint]; !ok {
|
|
return
|
|
}
|
|
a.RemoveCheck(structs.NodeMaint, true)
|
|
a.logger.Printf("[INFO] agent: Node left maintenance mode")
|
|
}
|
|
|
|
func (a *Agent) loadLimits(conf *config.RuntimeConfig) {
|
|
a.config.RPCRateLimit = conf.RPCRateLimit
|
|
a.config.RPCMaxBurst = conf.RPCMaxBurst
|
|
}
|
|
|
|
func (a *Agent) ReloadConfig(newCfg *config.RuntimeConfig) error {
|
|
// Bulk update the services and checks
|
|
a.PauseSync()
|
|
defer a.ResumeSync()
|
|
|
|
a.stateLock.Lock()
|
|
defer a.stateLock.Unlock()
|
|
|
|
// Snapshot the current state, and use that to initialize the checks when
|
|
// they are recreated.
|
|
snap := a.snapshotCheckState()
|
|
|
|
// First unload all checks, services, and metadata. This lets us begin the reload
|
|
// with a clean slate.
|
|
if err := a.unloadServices(); err != nil {
|
|
return fmt.Errorf("Failed unloading services: %s", err)
|
|
}
|
|
if err := a.unloadChecks(); err != nil {
|
|
return fmt.Errorf("Failed unloading checks: %s", err)
|
|
}
|
|
a.unloadMetadata()
|
|
|
|
// Reload tokens - should be done before all the other loading
|
|
// to ensure the correct tokens are available for attaching to
|
|
// the checks and service registrations.
|
|
a.loadTokens(newCfg)
|
|
|
|
if err := a.tlsConfigurator.Update(newCfg.ToTLSUtilConfig()); err != nil {
|
|
return fmt.Errorf("Failed reloading tls configuration: %s", err)
|
|
}
|
|
|
|
// Reload service/check definitions and metadata.
|
|
if err := a.loadServices(newCfg); err != nil {
|
|
return fmt.Errorf("Failed reloading services: %s", err)
|
|
}
|
|
if err := a.loadChecks(newCfg, snap); err != nil {
|
|
return fmt.Errorf("Failed reloading checks: %s", err)
|
|
}
|
|
if err := a.loadMetadata(newCfg); err != nil {
|
|
return fmt.Errorf("Failed reloading metadata: %s", err)
|
|
}
|
|
|
|
if err := a.reloadWatches(newCfg); err != nil {
|
|
return fmt.Errorf("Failed reloading watches: %v", err)
|
|
}
|
|
|
|
a.loadLimits(newCfg)
|
|
|
|
for _, s := range a.dnsServers {
|
|
if err := s.ReloadConfig(newCfg); err != nil {
|
|
return fmt.Errorf("Failed reloading dns config : %v", err)
|
|
}
|
|
}
|
|
|
|
// this only gets used by the consulConfig function and since
|
|
// that is only ever done during init and reload here then
|
|
// an in place modification is safe as reloads cannot be
|
|
// concurrent due to both gaing a full lock on the stateLock
|
|
a.config.ConfigEntryBootstrap = newCfg.ConfigEntryBootstrap
|
|
|
|
// create the config for the rpc server/client
|
|
consulCfg, err := a.consulConfig()
|
|
if err != nil {
|
|
return err
|
|
}
|
|
|
|
if err := a.delegate.ReloadConfig(consulCfg); err != nil {
|
|
return err
|
|
}
|
|
|
|
// Update filtered metrics
|
|
metrics.UpdateFilter(newCfg.Telemetry.AllowedPrefixes,
|
|
newCfg.Telemetry.BlockedPrefixes)
|
|
|
|
a.State.SetDiscardCheckOutput(newCfg.DiscardCheckOutput)
|
|
|
|
return nil
|
|
}
|
|
|
|
// LocalBlockingQuery performs a blocking query in a generic way against
|
|
// local agent state that has no RPC or raft to back it. It uses `hash` parameter
|
|
// instead of an `index`.
|
|
// `alwaysBlock` determines whether we block if the provided hash is empty.
|
|
// Callers like the AgentService endpoint will want to return the current result if a hash isn't provided.
|
|
// On the other hand, for cache notifications we always want to block. This avoids an empty first response.
|
|
func (a *Agent) LocalBlockingQuery(alwaysBlock bool, hash string, wait time.Duration,
|
|
fn func(ws memdb.WatchSet) (string, interface{}, error)) (string, interface{}, error) {
|
|
|
|
// If we are not blocking we can skip tracking and allocating - nil WatchSet
|
|
// is still valid to call Add on and will just be a no op.
|
|
var ws memdb.WatchSet
|
|
var timeout *time.Timer
|
|
|
|
if alwaysBlock || hash != "" {
|
|
if wait == 0 {
|
|
wait = defaultQueryTime
|
|
}
|
|
if wait > 10*time.Minute {
|
|
wait = maxQueryTime
|
|
}
|
|
// Apply a small amount of jitter to the request.
|
|
wait += lib.RandomStagger(wait / 16)
|
|
timeout = time.NewTimer(wait)
|
|
}
|
|
|
|
for {
|
|
// Must reset this every loop in case the Watch set is already closed but
|
|
// hash remains same. In that case we'll need to re-block on ws.Watch()
|
|
// again.
|
|
ws = memdb.NewWatchSet()
|
|
curHash, curResp, err := fn(ws)
|
|
if err != nil {
|
|
return "", curResp, err
|
|
}
|
|
|
|
// Return immediately if there is no timeout, the hash is different or the
|
|
// Watch returns true (indicating timeout fired). Note that Watch on a nil
|
|
// WatchSet immediately returns false which would incorrectly cause this to
|
|
// loop and repeat again, however we rely on the invariant that ws == nil
|
|
// IFF timeout == nil in which case the Watch call is never invoked.
|
|
if timeout == nil || hash != curHash || ws.Watch(timeout.C) {
|
|
return curHash, curResp, err
|
|
}
|
|
// Watch returned false indicating a change was detected, loop and repeat
|
|
// the callback to load the new value. If agent sync is paused it means
|
|
// local state is currently being bulk-edited e.g. config reload. In this
|
|
// case it's likely that local state just got unloaded and may or may not be
|
|
// reloaded yet. Wait a short amount of time for Sync to resume to ride out
|
|
// typical config reloads.
|
|
if syncPauseCh := a.SyncPausedCh(); syncPauseCh != nil {
|
|
select {
|
|
case <-syncPauseCh:
|
|
case <-timeout.C:
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
// registerCache configures the cache and registers all the supported
|
|
// types onto the cache. This is NOT safe to call multiple times so
|
|
// care should be taken to call this exactly once after the cache
|
|
// field has been initialized.
|
|
func (a *Agent) registerCache() {
|
|
// Note that you should register the _agent_ as the RPC implementation and not
|
|
// the a.delegate directly, otherwise tests that rely on overriding RPC
|
|
// routing via a.registerEndpoint will not work.
|
|
|
|
a.cache.RegisterType(cachetype.ConnectCARootName, &cachetype.ConnectCARoot{
|
|
RPC: a,
|
|
}, &cache.RegisterOptions{
|
|
// Maintain a blocking query, retry dropped connections quickly
|
|
Refresh: true,
|
|
RefreshTimer: 0 * time.Second,
|
|
RefreshTimeout: 10 * time.Minute,
|
|
})
|
|
|
|
a.cache.RegisterType(cachetype.ConnectCALeafName, &cachetype.ConnectCALeaf{
|
|
RPC: a,
|
|
Cache: a.cache,
|
|
Datacenter: a.config.Datacenter,
|
|
TestOverrideCAChangeInitialDelay: a.config.ConnectTestCALeafRootChangeSpread,
|
|
}, &cache.RegisterOptions{
|
|
// Maintain a blocking query, retry dropped connections quickly
|
|
Refresh: true,
|
|
RefreshTimer: 0 * time.Second,
|
|
RefreshTimeout: 10 * time.Minute,
|
|
})
|
|
|
|
a.cache.RegisterType(cachetype.IntentionMatchName, &cachetype.IntentionMatch{
|
|
RPC: a,
|
|
}, &cache.RegisterOptions{
|
|
// Maintain a blocking query, retry dropped connections quickly
|
|
Refresh: true,
|
|
RefreshTimer: 0 * time.Second,
|
|
RefreshTimeout: 10 * time.Minute,
|
|
})
|
|
|
|
a.cache.RegisterType(cachetype.CatalogServicesName, &cachetype.CatalogServices{
|
|
RPC: a,
|
|
}, &cache.RegisterOptions{
|
|
// Maintain a blocking query, retry dropped connections quickly
|
|
Refresh: true,
|
|
RefreshTimer: 0 * time.Second,
|
|
RefreshTimeout: 10 * time.Minute,
|
|
})
|
|
|
|
a.cache.RegisterType(cachetype.HealthServicesName, &cachetype.HealthServices{
|
|
RPC: a,
|
|
}, &cache.RegisterOptions{
|
|
// Maintain a blocking query, retry dropped connections quickly
|
|
Refresh: true,
|
|
RefreshTimer: 0 * time.Second,
|
|
RefreshTimeout: 10 * time.Minute,
|
|
})
|
|
|
|
a.cache.RegisterType(cachetype.PreparedQueryName, &cachetype.PreparedQuery{
|
|
RPC: a,
|
|
}, &cache.RegisterOptions{
|
|
// Prepared queries don't support blocking
|
|
Refresh: false,
|
|
})
|
|
|
|
a.cache.RegisterType(cachetype.NodeServicesName, &cachetype.NodeServices{
|
|
RPC: a,
|
|
}, &cache.RegisterOptions{
|
|
// Maintain a blocking query, retry dropped connections quickly
|
|
Refresh: true,
|
|
RefreshTimer: 0 * time.Second,
|
|
RefreshTimeout: 10 * time.Minute,
|
|
})
|
|
|
|
a.cache.RegisterType(cachetype.ResolvedServiceConfigName, &cachetype.ResolvedServiceConfig{
|
|
RPC: a,
|
|
}, &cache.RegisterOptions{
|
|
// Maintain a blocking query, retry dropped connections quickly
|
|
Refresh: true,
|
|
RefreshTimer: 0 * time.Second,
|
|
RefreshTimeout: 10 * time.Minute,
|
|
})
|
|
|
|
a.cache.RegisterType(cachetype.CatalogListServicesName, &cachetype.CatalogListServices{
|
|
RPC: a,
|
|
}, &cache.RegisterOptions{
|
|
Refresh: true,
|
|
RefreshTimer: 0 * time.Second,
|
|
RefreshTimeout: 10 * time.Minute,
|
|
})
|
|
|
|
a.cache.RegisterType(cachetype.CatalogDatacentersName, &cachetype.CatalogDatacenters{
|
|
RPC: a,
|
|
}, &cache.RegisterOptions{
|
|
Refresh: false,
|
|
})
|
|
|
|
a.cache.RegisterType(cachetype.InternalServiceDumpName, &cachetype.InternalServiceDump{
|
|
RPC: a,
|
|
}, &cache.RegisterOptions{
|
|
Refresh: true,
|
|
RefreshTimer: 0 * time.Second,
|
|
RefreshTimeout: 10 * time.Minute,
|
|
})
|
|
|
|
a.cache.RegisterType(cachetype.CompiledDiscoveryChainName, &cachetype.CompiledDiscoveryChain{
|
|
RPC: a,
|
|
}, &cache.RegisterOptions{
|
|
// Maintain a blocking query, retry dropped connections quickly
|
|
Refresh: true,
|
|
RefreshTimer: 0 * time.Second,
|
|
RefreshTimeout: 10 * time.Minute,
|
|
})
|
|
|
|
a.cache.RegisterType(cachetype.ConfigEntriesName, &cachetype.ConfigEntries{
|
|
RPC: a,
|
|
}, &cache.RegisterOptions{
|
|
// Maintain a blocking query, retry dropped connections quickly
|
|
Refresh: true,
|
|
RefreshTimer: 0 * time.Second,
|
|
RefreshTimeout: 10 * time.Minute,
|
|
})
|
|
|
|
a.cache.RegisterType(cachetype.ServiceHTTPChecksName, &cachetype.ServiceHTTPChecks{
|
|
Agent: a,
|
|
}, &cache.RegisterOptions{
|
|
Refresh: true,
|
|
RefreshTimer: 0 * time.Second,
|
|
RefreshTimeout: 10 * time.Minute,
|
|
})
|
|
}
|
|
|
|
func (a *Agent) LocalState() *local.State {
|
|
return a.State
|
|
}
|
|
|
|
// rerouteExposedChecks will inject proxy address into check targets
|
|
// Future calls to check() will dial the proxy listener
|
|
// The agent stateLock MUST be held for this to be called
|
|
func (a *Agent) rerouteExposedChecks(serviceID string, proxyAddr string) error {
|
|
for _, c := range a.checkHTTPs {
|
|
if c.ServiceID != serviceID {
|
|
continue
|
|
}
|
|
port, err := a.listenerPortLocked(serviceID, string(c.CheckID))
|
|
if err != nil {
|
|
return err
|
|
}
|
|
c.ProxyHTTP = httpInjectAddr(c.HTTP, proxyAddr, port)
|
|
}
|
|
for _, c := range a.checkGRPCs {
|
|
if c.ServiceID != serviceID {
|
|
continue
|
|
}
|
|
port, err := a.listenerPortLocked(serviceID, string(c.CheckID))
|
|
if err != nil {
|
|
return err
|
|
}
|
|
c.ProxyGRPC = grpcInjectAddr(c.GRPC, proxyAddr, port)
|
|
}
|
|
return nil
|
|
}
|
|
|
|
// resetExposedChecks will set Proxy addr in HTTP checks to empty string
|
|
// Future calls to check() will use the original target c.HTTP or c.GRPC
|
|
// The agent stateLock MUST be held for this to be called
|
|
func (a *Agent) resetExposedChecks(serviceID string) {
|
|
ids := make([]string, 0)
|
|
for _, c := range a.checkHTTPs {
|
|
if c.ServiceID == serviceID {
|
|
c.ProxyHTTP = ""
|
|
ids = append(ids, string(c.CheckID))
|
|
}
|
|
}
|
|
for _, c := range a.checkGRPCs {
|
|
if c.ServiceID == serviceID {
|
|
c.ProxyGRPC = ""
|
|
ids = append(ids, string(c.CheckID))
|
|
}
|
|
}
|
|
for _, checkID := range ids {
|
|
delete(a.exposedPorts, listenerPortKey(serviceID, checkID))
|
|
}
|
|
}
|
|
|
|
// listenerPort allocates a port from the configured range
|
|
// The agent stateLock MUST be held when this is called
|
|
func (a *Agent) listenerPortLocked(svcID, checkID string) (int, error) {
|
|
key := listenerPortKey(svcID, checkID)
|
|
if a.exposedPorts == nil {
|
|
a.exposedPorts = make(map[string]int)
|
|
}
|
|
if p, ok := a.exposedPorts[key]; ok {
|
|
return p, nil
|
|
}
|
|
|
|
allocated := make(map[int]bool)
|
|
for _, v := range a.exposedPorts {
|
|
allocated[v] = true
|
|
}
|
|
|
|
var port int
|
|
for i := 0; i < a.config.ExposeMaxPort-a.config.ExposeMinPort; i++ {
|
|
port = a.config.ExposeMinPort + i
|
|
if !allocated[port] {
|
|
a.exposedPorts[key] = port
|
|
break
|
|
}
|
|
}
|
|
if port == 0 {
|
|
return 0, fmt.Errorf("no ports available to expose '%s'", checkID)
|
|
}
|
|
|
|
return port, nil
|
|
}
|
|
|
|
func listenerPortKey(svcID, checkID string) string {
|
|
return fmt.Sprintf("%s:%s", svcID, checkID)
|
|
}
|
|
|
|
// grpcInjectAddr injects an ip and port into an address of the form: ip:port[/service]
|
|
func grpcInjectAddr(existing string, ip string, port int) string {
|
|
portRepl := fmt.Sprintf("${1}:%d${3}", port)
|
|
out := grpcAddrRE.ReplaceAllString(existing, portRepl)
|
|
|
|
addrRepl := fmt.Sprintf("%s${2}${3}", ip)
|
|
out = grpcAddrRE.ReplaceAllString(out, addrRepl)
|
|
|
|
return out
|
|
}
|
|
|
|
// httpInjectAddr injects a port then an IP into a URL
|
|
func httpInjectAddr(url string, ip string, port int) string {
|
|
portRepl := fmt.Sprintf("${1}${2}:%d${4}${5}", port)
|
|
out := httpAddrRE.ReplaceAllString(url, portRepl)
|
|
|
|
// Ensure that ipv6 addr is enclosed in brackets (RFC 3986)
|
|
ip = fixIPv6(ip)
|
|
addrRepl := fmt.Sprintf("${1}%s${3}${4}${5}", ip)
|
|
out = httpAddrRE.ReplaceAllString(out, addrRepl)
|
|
|
|
return out
|
|
}
|
|
|
|
func fixIPv6(address string) string {
|
|
if strings.Count(address, ":") < 2 {
|
|
return address
|
|
}
|
|
if !strings.HasSuffix(address, "]") {
|
|
address = address + "]"
|
|
}
|
|
if !strings.HasPrefix(address, "[") {
|
|
address = "[" + address
|
|
}
|
|
return address
|
|
}
|
|
|
|
// defaultIfEmpty returns the value if not empty otherwise the default value.
|
|
func defaultIfEmpty(val, defaultVal string) string {
|
|
if val != "" {
|
|
return val
|
|
}
|
|
return defaultVal
|
|
}
|