3067 lines
93 KiB
Go
3067 lines
93 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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"strconv"
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"strings"
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"sync"
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"time"
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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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"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/proxy"
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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/api"
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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/types"
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"github.com/hashicorp/consul/watch"
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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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// 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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// 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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)
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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) error
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RPC(method string, args interface{}, reply interface{}) error
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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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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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// acls is an object that helps manage local ACL enforcement.
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acls *aclManager
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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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// 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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// checkLock protects updates to the check* maps
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checkLock 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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// 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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// proxyManager is the proxy process manager for managed Connect proxies.
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proxyManager *proxy.Manager
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}
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func New(c *config.RuntimeConfig) (*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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acls, err := newACLManager(c)
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if err != nil {
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return nil, err
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}
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a := &Agent{
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config: c,
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acls: acls,
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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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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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endpoints: make(map[string]string),
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tokens: new(token.Store),
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}
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// Set up the initial state of the token store based on the config.
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a.tokens.UpdateUserToken(a.config.ACLToken)
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a.tokens.UpdateAgentToken(a.config.ACLAgentToken)
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a.tokens.UpdateAgentMasterToken(a.config.ACLAgentMasterToken)
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a.tokens.UpdateACLReplicationToken(a.config.ACLReplicationToken)
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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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ProxyBindMinPort: cfg.ConnectProxyBindMinPort,
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ProxyBindMaxPort: cfg.ConnectProxyBindMaxPort,
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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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c := a.config
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logOutput := a.LogOutput
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if a.logger == nil {
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if logOutput == nil {
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logOutput = os.Stderr
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}
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a.logger = log.New(logOutput, "", log.LstdFlags)
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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 fmt.Errorf("Failed to setup node ID: %v", err)
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}
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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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// create the local state
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a.State = local.NewState(LocalConfig(c), a.logger, a.tokens)
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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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// create the cache
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a.cache = cache.New(nil)
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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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// 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)
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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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}
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a.delegate = server
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} else {
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client, err := consul.NewClientLogger(consulCfg, a.logger)
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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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}
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// the staggering of the state syncing depends on the cluster size.
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a.sync.ClusterSize = func() int { return len(a.delegate.LANMembers()) }
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// link the state with the consul server/client and the state syncer
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// via callbacks. After several attempts this was easier than using
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// channels since the event notification needs to be non-blocking
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// and that should be hidden in the state syncer implementation.
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a.State.Delegate = a.delegate
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a.State.TriggerSyncChanges = a.sync.SyncChanges.Trigger
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// Register the cache. We do this much later so the delegate is
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// populated from above.
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a.registerCache()
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// Load checks/services/metadata.
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if err := a.loadServices(c); err != nil {
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return err
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}
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if err := a.loadProxies(c); err != nil {
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return err
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}
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if err := a.loadChecks(c); err != nil {
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return err
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}
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if err := a.loadMetadata(c); err != nil {
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return err
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}
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// create the proxy process manager and start it. This is purposely
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// done here after the local state above is loaded in so we can have
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// a more accurate initial state view.
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if !c.ConnectTestDisableManagedProxies {
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a.proxyManager = proxy.NewManager()
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a.proxyManager.AllowRoot = a.config.ConnectProxyAllowManagedRoot
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a.proxyManager.State = a.State
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a.proxyManager.Logger = a.logger
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if a.config.DataDir != "" {
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// DataDir is required for all non-dev mode agents, but we want
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// to allow setting the data dir for demos and so on for the agent,
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// so do the check above instead.
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a.proxyManager.DataDir = filepath.Join(a.config.DataDir, "proxy")
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// Restore from our snapshot (if it exists)
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if err := a.proxyManager.Restore(a.proxyManager.SnapshotPath()); err != nil {
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a.logger.Printf("[WARN] agent: error restoring proxy state: %s", err)
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}
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}
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go a.proxyManager.Run()
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}
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// Start watching for critical services to deregister, based on their
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// checks.
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go a.reapServices()
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|
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// Start handling events.
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go a.handleEvents()
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// Start sending network coordinate to the server.
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if !c.DisableCoordinates {
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go a.sendCoordinate()
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}
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// Write out the PID file if necessary.
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if err := a.storePid(); err != nil {
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return err
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}
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// start DNS servers
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if err := a.listenAndServeDNS(); err != nil {
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return err
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}
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// Create listeners and unstarted servers; see comment on listenHTTP why
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// we are doing this.
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servers, err := a.listenHTTP()
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if err != nil {
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return err
|
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}
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// Start HTTP and HTTPS servers.
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for _, srv := range servers {
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if err := a.serveHTTP(srv); err != nil {
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return err
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}
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a.httpServers = append(a.httpServers, srv)
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}
|
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|
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// register watches
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if err := a.reloadWatches(a.config); err != nil {
|
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return err
|
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}
|
|
|
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// start retry join
|
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go a.retryJoinLAN()
|
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go a.retryJoinWAN()
|
|
|
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return nil
|
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}
|
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|
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func (a *Agent) listenAndServeDNS() error {
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notif := make(chan net.Addr, len(a.config.DNSAddrs))
|
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for _, addr := range a.config.DNSAddrs {
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// create server
|
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s, err := NewDNSServer(a)
|
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if err != nil {
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return err
|
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}
|
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a.dnsServers = append(a.dnsServers, s)
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|
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// start server
|
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a.wgServers.Add(1)
|
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go func(addr net.Addr) {
|
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defer a.wgServers.Done()
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err := s.ListenAndServe(addr.Network(), addr.String(), func() { notif <- addr })
|
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if err != nil && !strings.Contains(err.Error(), "accept") {
|
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a.logger.Printf("[ERR] agent: Error starting DNS server %s (%s): %v", addr.String(), addr.Network(), err)
|
|
}
|
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}(addr)
|
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}
|
|
|
|
// wait for servers to be up
|
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timeout := time.After(time.Second)
|
|
for range a.config.DNSAddrs {
|
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select {
|
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case addr := <-notif:
|
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a.logger.Printf("[INFO] agent: Started DNS server %s (%s)", addr.String(), addr.Network())
|
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continue
|
|
case <-timeout:
|
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return fmt.Errorf("agent: timeout starting DNS servers")
|
|
}
|
|
}
|
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return 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
|
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var servers []*HTTPServer
|
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start := func(proto string, addrs []net.Addr) error {
|
|
for _, addr := range addrs {
|
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var l net.Listener
|
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var tlscfg *tls.Config
|
|
var err error
|
|
|
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switch x := addr.(type) {
|
|
case *net.UnixAddr:
|
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l, err = a.listenSocket(x.Name)
|
|
if err != nil {
|
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return err
|
|
}
|
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|
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case *net.TCPAddr:
|
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l, err = net.Listen("tcp", x.String())
|
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if err != nil {
|
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return err
|
|
}
|
|
l = &tcpKeepAliveListener{l.(*net.TCPListener)}
|
|
|
|
if proto == "https" {
|
|
tlscfg, err = a.config.IncomingHTTPSConfig()
|
|
if err != nil {
|
|
return err
|
|
}
|
|
l = tls.NewListener(l, tlscfg)
|
|
}
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|
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default:
|
|
return fmt.Errorf("unsupported address type %T", addr)
|
|
}
|
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ln = append(ln, l)
|
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|
|
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
|
|
}
|
|
}
|
|
|
|
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)
|
|
}
|
|
|
|
// Determine the primary http(s) endpoint.
|
|
var netaddr net.Addr
|
|
https := false
|
|
if len(cfg.HTTPAddrs) > 0 {
|
|
netaddr = cfg.HTTPAddrs[0]
|
|
} else {
|
|
netaddr = cfg.HTTPSAddrs[0]
|
|
https = true
|
|
}
|
|
addr := netaddr.String()
|
|
if netaddr.Network() == "unix" {
|
|
addr = "unix://" + addr
|
|
https = false
|
|
} else if https {
|
|
addr = "https://" + addr
|
|
}
|
|
|
|
// Fire off a goroutine for each new watch plan.
|
|
for _, wp := range watchPlans {
|
|
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
|
|
|
|
config := api.DefaultConfig()
|
|
if https {
|
|
if a.config.CAPath != "" {
|
|
config.TLSConfig.CAPath = a.config.CAPath
|
|
}
|
|
if a.config.CAFile != "" {
|
|
config.TLSConfig.CAFile = a.config.CAFile
|
|
}
|
|
config.TLSConfig.Address = 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.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.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.ConsulSerfLANGossipInterval
|
|
base.SerfLANConfig.MemberlistConfig.ProbeInterval = a.config.ConsulSerfLANProbeInterval
|
|
base.SerfLANConfig.MemberlistConfig.ProbeTimeout = a.config.ConsulSerfLANProbeTimeout
|
|
base.SerfLANConfig.MemberlistConfig.SuspicionMult = a.config.ConsulSerfLANSuspicionMult
|
|
|
|
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.ConsulSerfWANGossipInterval
|
|
base.SerfWANConfig.MemberlistConfig.ProbeInterval = a.config.ConsulSerfWANProbeInterval
|
|
base.SerfWANConfig.MemberlistConfig.ProbeTimeout = a.config.ConsulSerfWANProbeTimeout
|
|
base.SerfWANConfig.MemberlistConfig.SuspicionMult = a.config.ConsulSerfWANSuspicionMult
|
|
} else {
|
|
// Disable serf WAN federation
|
|
base.SerfWANConfig = nil
|
|
}
|
|
|
|
base.RPCAddr = a.config.RPCBindAddr
|
|
base.RPCAdvertise = a.config.RPCAdvertiseAddr
|
|
|
|
if a.config.ReconnectTimeoutLAN != 0 {
|
|
base.SerfLANConfig.ReconnectTimeout = a.config.ReconnectTimeoutLAN
|
|
}
|
|
if a.config.ReconnectTimeoutWAN != 0 {
|
|
base.SerfWANConfig.ReconnectTimeout = a.config.ReconnectTimeoutWAN
|
|
}
|
|
|
|
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.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.ACLMasterToken != "" {
|
|
base.ACLMasterToken = a.config.ACLMasterToken
|
|
}
|
|
if a.config.ACLDatacenter != "" {
|
|
base.ACLDatacenter = a.config.ACLDatacenter
|
|
}
|
|
if a.config.ACLTTL != 0 {
|
|
base.ACLTTL = a.config.ACLTTL
|
|
}
|
|
if a.config.ACLDefaultPolicy != "" {
|
|
base.ACLDefaultPolicy = a.config.ACLDefaultPolicy
|
|
}
|
|
if a.config.ACLDownPolicy != "" {
|
|
base.ACLDownPolicy = a.config.ACLDownPolicy
|
|
}
|
|
base.EnableACLReplication = a.config.EnableACLReplication
|
|
if a.config.ACLEnforceVersion8 {
|
|
base.ACLEnforceVersion8 = a.config.ACLEnforceVersion8
|
|
}
|
|
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
|
|
|
|
// 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 with the default config if it's the consul provider.
|
|
if a.config.ConnectCAProvider == "consul" {
|
|
for k, v := range a.config.ConnectCAConfig {
|
|
base.CAConfig.Config[k] = v
|
|
}
|
|
} else {
|
|
base.CAConfig.Config = a.config.ConnectCAConfig
|
|
}
|
|
}
|
|
}
|
|
|
|
// Setup the user event callback
|
|
base.UserEventHandler = func(e serf.UserEvent) {
|
|
select {
|
|
case a.eventCh <- e:
|
|
case <-a.shutdownCh:
|
|
}
|
|
}
|
|
|
|
// Setup the loggers
|
|
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)
|
|
}
|
|
|
|
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 all the checks
|
|
a.checkLock.Lock()
|
|
defer a.checkLock.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()
|
|
}
|
|
|
|
// Stop the proxy manager
|
|
if a.proxyManager != nil {
|
|
// If persistence is disabled (implies DevMode but a subset of DevMode) then
|
|
// don't leave the proxies running since the agent will not be able to
|
|
// recover them later.
|
|
if a.config.DataDir == "" {
|
|
a.logger.Printf("[WARN] agent: dev mode disabled persistence, killing " +
|
|
"all proxies since we can't recover them")
|
|
if err := a.proxyManager.Kill(); err != nil {
|
|
a.logger.Printf("[WARN] agent: error shutting down proxy manager: %s", err)
|
|
}
|
|
} else {
|
|
if err := a.proxyManager.Close(); err != nil {
|
|
a.logger.Printf("[WARN] agent: error shutting down proxy manager: %s", err)
|
|
}
|
|
}
|
|
}
|
|
|
|
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 {
|
|
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)
|
|
a.logger.Printf("[INFO] agent: (LAN) joined: %d Err: %v", n, err)
|
|
if err == nil && a.joinLANNotifier != nil {
|
|
if notifErr := a.joinLANNotifier.Notify(systemd.Ready); notifErr != nil {
|
|
a.logger.Printf("[DEBUG] agent: systemd notify failed: %v", notifErr)
|
|
}
|
|
}
|
|
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")
|
|
}
|
|
a.logger.Printf("[INFO] agent: (WAN) joined: %d Err: %v", n, err)
|
|
return
|
|
}
|
|
|
|
// ForceLeave is used to remove a failed node from the cluster
|
|
func (a *Agent) ForceLeave(node string) (err error) {
|
|
a.logger.Printf("[INFO] agent: Force leaving node: %v", node)
|
|
err = a.delegate.RemoveFailedNode(node)
|
|
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 make
|
|
func (a *Agent) PauseSync() {
|
|
a.sync.Pause()
|
|
}
|
|
|
|
// ResumeSync is used to unpause anti-entropy after bulk changes are make
|
|
func (a *Agent) ResumeSync() {
|
|
a.sync.Resume()
|
|
}
|
|
|
|
// 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.checkLock.Lock()
|
|
timeout := a.checkReapAfter[checkID]
|
|
a.checkLock.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
|
|
a.RemoveService(serviceID, true)
|
|
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
|
|
}
|
|
|
|
// persistService saves a service definition to a JSON file in the data dir
|
|
func (a *Agent) persistService(service *structs.NodeService) error {
|
|
svcPath := filepath.Join(a.config.DataDir, servicesDir, stringHash(service.ID))
|
|
|
|
wrapped := persistedService{
|
|
Token: a.State.ServiceToken(service.ID),
|
|
Service: service,
|
|
}
|
|
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
|
|
}
|
|
|
|
// persistedProxy is used to wrap a proxy definition and bundle it with an Proxy
|
|
// token so we can continue to authenticate the running proxy after a restart.
|
|
type persistedProxy struct {
|
|
ProxyToken string
|
|
Proxy *structs.ConnectManagedProxy
|
|
}
|
|
|
|
// persistProxy saves a proxy definition to a JSON file in the data dir
|
|
func (a *Agent) persistProxy(proxy *local.ManagedProxy) error {
|
|
proxyPath := filepath.Join(a.config.DataDir, proxyDir,
|
|
stringHash(proxy.Proxy.ProxyService.ID))
|
|
|
|
wrapped := persistedProxy{
|
|
ProxyToken: proxy.ProxyToken,
|
|
Proxy: proxy.Proxy,
|
|
}
|
|
encoded, err := json.Marshal(wrapped)
|
|
if err != nil {
|
|
return err
|
|
}
|
|
|
|
return file.WriteAtomic(proxyPath, encoded)
|
|
}
|
|
|
|
// purgeProxy removes a persisted proxy definition file from the data dir
|
|
func (a *Agent) purgeProxy(proxyID string) error {
|
|
proxyPath := filepath.Join(a.config.DataDir, proxyDir, stringHash(proxyID))
|
|
if _, err := os.Stat(proxyPath); err == nil {
|
|
return os.Remove(proxyPath)
|
|
}
|
|
return nil
|
|
}
|
|
|
|
// persistCheck saves a check definition to the local agent's state directory
|
|
func (a *Agent) persistCheck(check *structs.HealthCheck, chkType *structs.CheckType) 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),
|
|
}
|
|
|
|
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
|
|
}
|
|
|
|
// 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) 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)
|
|
}
|
|
}
|
|
|
|
// 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)
|
|
}
|
|
}
|
|
|
|
// Pause the service syncs during modification
|
|
a.PauseSync()
|
|
defer a.ResumeSync()
|
|
|
|
// Take a snapshot of the current state of checks (if any), and
|
|
// restore them before resuming anti-entropy.
|
|
snap := a.snapshotCheckState()
|
|
defer a.restoreCheckState(snap)
|
|
|
|
// Add the service
|
|
a.State.AddService(service, token)
|
|
|
|
// Persist the service to a file
|
|
if persist && a.config.DataDir != "" {
|
|
if err := a.persistService(service); err != nil {
|
|
return err
|
|
}
|
|
}
|
|
|
|
// Create an associated health check
|
|
for i, chkType := range chkTypes {
|
|
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
|
|
}
|
|
if err := a.AddCheck(check, chkType, persist, token); err != nil {
|
|
return err
|
|
}
|
|
}
|
|
return nil
|
|
}
|
|
|
|
// 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, persist bool) error {
|
|
// Validate ServiceID
|
|
if serviceID == "" {
|
|
return fmt.Errorf("ServiceID missing")
|
|
}
|
|
|
|
// Remove service immediately
|
|
if err := a.State.RemoveService(serviceID); 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
|
|
}
|
|
}
|
|
|
|
// Deregister any associated health checks
|
|
for checkID, check := range a.State.Checks() {
|
|
if check.ServiceID != serviceID {
|
|
continue
|
|
}
|
|
if err := a.RemoveCheck(checkID, persist); err != nil {
|
|
return err
|
|
}
|
|
}
|
|
|
|
log.Printf("[DEBUG] agent: removed service %q", serviceID)
|
|
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) 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() && !a.config.EnableScriptChecks {
|
|
return fmt.Errorf("Scripts are disabled on this agent; to enable, configure 'enable_script_checks' to true")
|
|
}
|
|
}
|
|
|
|
if check.ServiceID != "" {
|
|
s := a.State.Service(check.ServiceID)
|
|
if s == nil {
|
|
return fmt.Errorf("ServiceID %q does not exist", check.ServiceID)
|
|
}
|
|
check.ServiceName = s.Service
|
|
check.ServiceTags = s.Tags
|
|
}
|
|
|
|
a.checkLock.Lock()
|
|
defer a.checkLock.Unlock()
|
|
|
|
// Check if already registered
|
|
if chkType != nil {
|
|
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,
|
|
TTL: chkType.TTL,
|
|
Logger: a.logger,
|
|
}
|
|
|
|
// 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, err := a.setupTLSClientConfig(chkType.TLSSkipVerify)
|
|
if err != nil {
|
|
return fmt.Errorf("Failed to set up TLS: %v", err)
|
|
}
|
|
|
|
http := &checks.CheckHTTP{
|
|
Notify: a.State,
|
|
CheckID: check.CheckID,
|
|
HTTP: chkType.HTTP,
|
|
Header: chkType.Header,
|
|
Method: chkType.Method,
|
|
Interval: chkType.Interval,
|
|
Timeout: chkType.Timeout,
|
|
Logger: a.logger,
|
|
TLSClientConfig: tlsClientConfig,
|
|
}
|
|
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,
|
|
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 {
|
|
var err error
|
|
tlsClientConfig, err = a.setupTLSClientConfig(chkType.TLSSkipVerify)
|
|
if err != nil {
|
|
return fmt.Errorf("Failed to set up TLS: %v", err)
|
|
}
|
|
}
|
|
|
|
grpc := &checks.CheckGRPC{
|
|
Notify: a.State,
|
|
CheckID: check.CheckID,
|
|
GRPC: chkType.GRPC,
|
|
Interval: chkType.Interval,
|
|
Timeout: chkType.Timeout,
|
|
Logger: a.logger,
|
|
TLSClientConfig: tlsClientConfig,
|
|
}
|
|
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"), checks.BufSize)
|
|
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,
|
|
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,
|
|
ScriptArgs: chkType.ScriptArgs,
|
|
Interval: chkType.Interval,
|
|
Timeout: chkType.Timeout,
|
|
Logger: a.logger,
|
|
}
|
|
monitor.Start()
|
|
a.checkMonitors[check.CheckID] = monitor
|
|
|
|
default:
|
|
return fmt.Errorf("Check type is not valid")
|
|
}
|
|
|
|
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)
|
|
}
|
|
}
|
|
|
|
// Add to the local state for anti-entropy
|
|
err := a.State.AddCheck(check, token)
|
|
if err != nil {
|
|
a.cancelCheckMonitors(check.CheckID)
|
|
return err
|
|
}
|
|
|
|
// Persist the check
|
|
if persist && a.config.DataDir != "" {
|
|
return a.persistCheck(check, chkType)
|
|
}
|
|
|
|
return nil
|
|
}
|
|
|
|
func (a *Agent) setupTLSClientConfig(skipVerify bool) (tlsClientConfig *tls.Config, err error) {
|
|
// We re-use the API client's TLS structure since it
|
|
// closely aligns with Consul's internal configuration.
|
|
tlsConfig := &api.TLSConfig{
|
|
InsecureSkipVerify: skipVerify,
|
|
}
|
|
if a.config.EnableAgentTLSForChecks {
|
|
tlsConfig.Address = a.config.ServerName
|
|
tlsConfig.KeyFile = a.config.KeyFile
|
|
tlsConfig.CertFile = a.config.CertFile
|
|
tlsConfig.CAFile = a.config.CAFile
|
|
tlsConfig.CAPath = a.config.CAPath
|
|
}
|
|
tlsClientConfig, err = api.SetupTLSConfig(tlsConfig)
|
|
return
|
|
}
|
|
|
|
// 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 {
|
|
// Validate CheckID
|
|
if checkID == "" {
|
|
return fmt.Errorf("CheckID missing")
|
|
}
|
|
|
|
// Add to the local state for anti-entropy
|
|
a.State.RemoveCheck(checkID)
|
|
|
|
a.checkLock.Lock()
|
|
defer a.checkLock.Unlock()
|
|
|
|
a.cancelCheckMonitors(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
|
|
}
|
|
|
|
// AddProxy adds a new local Connect Proxy instance to be managed by the agent.
|
|
//
|
|
// It REQUIRES that the service that is being proxied is already present in the
|
|
// local state. Note that this is only used for agent-managed proxies so we can
|
|
// ensure that we always make this true. For externally managed and registered
|
|
// proxies we explicitly allow the proxy to be registered first to make
|
|
// bootstrap ordering of a new service simpler but the same is not true here
|
|
// since this is only ever called when setting up a _managed_ proxy which was
|
|
// registered as part of a service registration either from config or HTTP API
|
|
// call.
|
|
//
|
|
// The restoredProxyToken argument should only be used when restoring proxy
|
|
// definitions from disk; new proxies must leave it blank to get a new token
|
|
// assigned. We need to restore from disk to enable to continue authenticating
|
|
// running proxies that already had that credential injected.
|
|
func (a *Agent) AddProxy(proxy *structs.ConnectManagedProxy, persist bool,
|
|
restoredProxyToken string) error {
|
|
// Lookup the target service token in state if there is one.
|
|
token := a.State.ServiceToken(proxy.TargetServiceID)
|
|
|
|
// Copy the basic proxy structure so it isn't modified w/ defaults
|
|
proxyCopy := *proxy
|
|
proxy = &proxyCopy
|
|
if err := a.applyProxyDefaults(proxy); err != nil {
|
|
return err
|
|
}
|
|
|
|
// Add the proxy to local state first since we may need to assign a port which
|
|
// needs to be coordinate under state lock. AddProxy will generate the
|
|
// NodeService for the proxy populated with the allocated (or configured) port
|
|
// and an ID, but it doesn't add it to the agent directly since that could
|
|
// deadlock and we may need to coordinate adding it and persisting etc.
|
|
proxyState, err := a.State.AddProxy(proxy, token, restoredProxyToken)
|
|
if err != nil {
|
|
return err
|
|
}
|
|
proxyService := proxyState.Proxy.ProxyService
|
|
|
|
// Register proxy TCP check. The built in proxy doesn't listen publically
|
|
// until it's loaded certs so this ensures we won't route traffic until it's
|
|
// ready.
|
|
proxyCfg, err := a.applyProxyConfigDefaults(proxyState.Proxy)
|
|
if err != nil {
|
|
return err
|
|
}
|
|
chkTypes := []*structs.CheckType{
|
|
&structs.CheckType{
|
|
Name: "Connect Proxy Listening",
|
|
TCP: fmt.Sprintf("%s:%d", proxyCfg["bind_address"],
|
|
proxyCfg["bind_port"]),
|
|
Interval: 10 * time.Second,
|
|
},
|
|
}
|
|
|
|
err = a.AddService(proxyService, chkTypes, persist, token)
|
|
if err != nil {
|
|
// Remove the state too
|
|
a.State.RemoveProxy(proxyService.ID)
|
|
return err
|
|
}
|
|
|
|
// Persist the proxy
|
|
if persist && a.config.DataDir != "" {
|
|
return a.persistProxy(proxyState)
|
|
}
|
|
return nil
|
|
}
|
|
|
|
// applyProxyConfigDefaults takes a *structs.ConnectManagedProxy and returns
|
|
// it's Config map merged with any defaults from the Agent's config. It would be
|
|
// nicer if this were defined as a method on structs.ConnectManagedProxy but we
|
|
// can't do that because ot the import cycle it causes with agent/config.
|
|
func (a *Agent) applyProxyConfigDefaults(p *structs.ConnectManagedProxy) (map[string]interface{}, error) {
|
|
if p == nil || p.ProxyService == nil {
|
|
// Should never happen but protect from panic
|
|
return nil, fmt.Errorf("invalid proxy state")
|
|
}
|
|
|
|
// Lookup the target service
|
|
target := a.State.Service(p.TargetServiceID)
|
|
if target == nil {
|
|
// Can happen during deregistration race between proxy and scheduler.
|
|
return nil, fmt.Errorf("unknown target service ID: %s", p.TargetServiceID)
|
|
}
|
|
|
|
// Merge globals defaults
|
|
config := make(map[string]interface{})
|
|
for k, v := range a.config.ConnectProxyDefaultConfig {
|
|
if _, ok := config[k]; !ok {
|
|
config[k] = v
|
|
}
|
|
}
|
|
|
|
// Copy config from the proxy
|
|
for k, v := range p.Config {
|
|
config[k] = v
|
|
}
|
|
|
|
// Set defaults for anything that is still not specified but required.
|
|
// Note that these are not included in the content hash. Since we expect
|
|
// them to be static in general but some like the default target service
|
|
// port might not be. In that edge case services can set that explicitly
|
|
// when they re-register which will be caught though.
|
|
if _, ok := config["bind_port"]; !ok {
|
|
config["bind_port"] = p.ProxyService.Port
|
|
}
|
|
if _, ok := config["bind_address"]; !ok {
|
|
// Default to binding to the same address the agent is configured to
|
|
// bind to.
|
|
config["bind_address"] = a.config.BindAddr.String()
|
|
}
|
|
if _, ok := config["local_service_address"]; !ok {
|
|
// Default to localhost and the port the service registered with
|
|
config["local_service_address"] = fmt.Sprintf("127.0.0.1:%d", target.Port)
|
|
}
|
|
|
|
// Basic type conversions for expected types.
|
|
if raw, ok := config["bind_port"]; ok {
|
|
switch v := raw.(type) {
|
|
case float64:
|
|
// Common since HCL/JSON parse as float64
|
|
config["bind_port"] = int(v)
|
|
|
|
// NOTE(mitchellh): No default case since errors and validation
|
|
// are handled by the ServiceDefinition.Validate function.
|
|
}
|
|
}
|
|
|
|
return config, nil
|
|
}
|
|
|
|
// applyProxyDefaults modifies the given proxy by applying any configured
|
|
// defaults, such as the default execution mode, command, etc.
|
|
func (a *Agent) applyProxyDefaults(proxy *structs.ConnectManagedProxy) error {
|
|
// Set the default exec mode
|
|
if proxy.ExecMode == structs.ProxyExecModeUnspecified {
|
|
mode, err := structs.NewProxyExecMode(a.config.ConnectProxyDefaultExecMode)
|
|
if err != nil {
|
|
return err
|
|
}
|
|
|
|
proxy.ExecMode = mode
|
|
}
|
|
if proxy.ExecMode == structs.ProxyExecModeUnspecified {
|
|
proxy.ExecMode = structs.ProxyExecModeDaemon
|
|
}
|
|
|
|
// Set the default command to the globally configured default
|
|
if len(proxy.Command) == 0 {
|
|
switch proxy.ExecMode {
|
|
case structs.ProxyExecModeDaemon:
|
|
proxy.Command = a.config.ConnectProxyDefaultDaemonCommand
|
|
|
|
case structs.ProxyExecModeScript:
|
|
proxy.Command = a.config.ConnectProxyDefaultScriptCommand
|
|
}
|
|
}
|
|
|
|
// If there is no globally configured default we need to get the
|
|
// default command so we can do "consul connect proxy"
|
|
if len(proxy.Command) == 0 {
|
|
command, err := defaultProxyCommand(a.config)
|
|
if err != nil {
|
|
return err
|
|
}
|
|
|
|
proxy.Command = command
|
|
}
|
|
|
|
return nil
|
|
}
|
|
|
|
// RemoveProxy stops and removes a local proxy instance.
|
|
func (a *Agent) RemoveProxy(proxyID string, persist bool) error {
|
|
// Validate proxyID
|
|
if proxyID == "" {
|
|
return fmt.Errorf("proxyID missing")
|
|
}
|
|
|
|
// Remove the proxy from the local state
|
|
p, err := a.State.RemoveProxy(proxyID)
|
|
if err != nil {
|
|
return err
|
|
}
|
|
|
|
// Remove the proxy service as well. The proxy ID is also the ID
|
|
// of the servie, but we might as well use the service pointer.
|
|
if err := a.RemoveService(p.Proxy.ProxyService.ID, persist); err != nil {
|
|
return err
|
|
}
|
|
|
|
if persist && a.config.DataDir != "" {
|
|
return a.purgeProxy(proxyID)
|
|
}
|
|
|
|
return nil
|
|
}
|
|
|
|
// verifyProxyToken takes a token and attempts to verify it against the
|
|
// targetService name. If targetProxy is specified, then the local proxy token
|
|
// must exactly match the given proxy ID. cert, config, etc.).
|
|
//
|
|
// The given token may be a local-only proxy token or it may be an ACL token. We
|
|
// will attempt to verify the local proxy token first.
|
|
//
|
|
// The effective ACL token is returned along with a boolean which is true if the
|
|
// match was against a proxy token rather than an ACL token, and any error. In
|
|
// the case the token matches a proxy token, then the ACL token used to register
|
|
// that proxy's target service is returned for use in any RPC calls the proxy
|
|
// needs to make on behalf of that service. If the token was an ACL token
|
|
// already then it is always returned. Provided error is nil, a valid ACL token
|
|
// is always returned.
|
|
func (a *Agent) verifyProxyToken(token, targetService,
|
|
targetProxy string) (string, bool, error) {
|
|
// If we specify a target proxy, we look up that proxy directly. Otherwise,
|
|
// we resolve with any proxy we can find.
|
|
var proxy *local.ManagedProxy
|
|
if targetProxy != "" {
|
|
proxy = a.State.Proxy(targetProxy)
|
|
if proxy == nil {
|
|
return "", false, fmt.Errorf("unknown proxy service ID: %q", targetProxy)
|
|
}
|
|
|
|
// If the token DOESN'T match, then we reset the proxy which will
|
|
// cause the logic below to fall back to normal ACLs. Otherwise,
|
|
// we keep the proxy set because we also have to verify that the
|
|
// target service matches on the proxy.
|
|
if token != proxy.ProxyToken {
|
|
proxy = nil
|
|
}
|
|
} else {
|
|
proxy = a.resolveProxyToken(token)
|
|
}
|
|
|
|
// The existence of a token isn't enough, we also need to verify
|
|
// that the service name of the matching proxy matches our target
|
|
// service.
|
|
if proxy != nil {
|
|
// Get the target service since we only have the name. The nil
|
|
// check below should never be true since a proxy token always
|
|
// represents the existence of a local service.
|
|
target := a.State.Service(proxy.Proxy.TargetServiceID)
|
|
if target == nil {
|
|
return "", false, fmt.Errorf("proxy target service not found: %q",
|
|
proxy.Proxy.TargetServiceID)
|
|
}
|
|
|
|
if target.Service != targetService {
|
|
return "", false, acl.ErrPermissionDenied
|
|
}
|
|
|
|
// Resolve the actual ACL token used to register the proxy/service and
|
|
// return that for use in RPC calls.
|
|
return a.State.ServiceToken(proxy.Proxy.TargetServiceID), true, nil
|
|
}
|
|
|
|
// Doesn't match, we have to do a full token resolution. The required
|
|
// permission for any proxy-related endpoint is service:write, since
|
|
// to register a proxy you require that permission and sensitive data
|
|
// is usually present in the configuration.
|
|
rule, err := a.resolveToken(token)
|
|
if err != nil {
|
|
return "", false, err
|
|
}
|
|
if rule != nil && !rule.ServiceWrite(targetService, nil) {
|
|
return "", false, acl.ErrPermissionDenied
|
|
}
|
|
|
|
return token, false, nil
|
|
}
|
|
|
|
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.checkLock.Lock()
|
|
defer a.checkLock.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.
|
|
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, output); 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 {
|
|
// 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)
|
|
}
|
|
if err := a.AddService(ns, chkTypes, false, service.Token); err != nil {
|
|
return fmt.Errorf("Failed to register 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
|
|
}
|
|
|
|
// Open the file for reading
|
|
file := filepath.Join(svcDir, fi.Name())
|
|
fh, err := os.Open(file)
|
|
if err != nil {
|
|
return fmt.Errorf("failed opening service file %q: %s", file, err)
|
|
}
|
|
|
|
// Read the contents into a buffer
|
|
buf, err := ioutil.ReadAll(fh)
|
|
fh.Close()
|
|
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
|
|
|
|
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)
|
|
}
|
|
} else {
|
|
a.logger.Printf("[DEBUG] agent: restored service definition %q from %q",
|
|
serviceID, file)
|
|
if err := a.AddService(p.Service, nil, false, p.Token); err != nil {
|
|
return fmt.Errorf("failed adding service %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.RemoveService(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) error {
|
|
// Register the checks from config
|
|
for _, check := range conf.Checks {
|
|
health := check.HealthCheck(conf.NodeName)
|
|
chkType := check.CheckType()
|
|
if err := a.AddCheck(health, chkType, false, check.Token); 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
|
|
}
|
|
|
|
// Open the file for reading
|
|
file := filepath.Join(checkDir, fi.Name())
|
|
fh, err := os.Open(file)
|
|
if err != nil {
|
|
return fmt.Errorf("Failed opening check file %q: %s", file, err)
|
|
}
|
|
|
|
// Read the contents into a buffer
|
|
buf, err := ioutil.ReadAll(fh)
|
|
fh.Close()
|
|
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
|
|
|
|
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
|
|
|
|
if err := a.AddCheck(p.Check, p.ChkType, false, p.Token); 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.RemoveCheck(id, false); err != nil {
|
|
return fmt.Errorf("Failed deregistering check '%s': %s", id, err)
|
|
}
|
|
}
|
|
return nil
|
|
}
|
|
|
|
// loadProxies will load connect proxy definitions from configuration and
|
|
// persisted definitions on disk, and load them into the local agent.
|
|
func (a *Agent) loadProxies(conf *config.RuntimeConfig) error {
|
|
for _, svc := range conf.Services {
|
|
if svc.Connect != nil {
|
|
proxy, err := svc.ConnectManagedProxy()
|
|
if err != nil {
|
|
return fmt.Errorf("failed adding proxy: %s", err)
|
|
}
|
|
if proxy == nil {
|
|
continue
|
|
}
|
|
if err := a.AddProxy(proxy, false, ""); err != nil {
|
|
return fmt.Errorf("failed adding proxy: %s", err)
|
|
}
|
|
}
|
|
}
|
|
|
|
// Load any persisted proxies
|
|
proxyDir := filepath.Join(a.config.DataDir, proxyDir)
|
|
files, err := ioutil.ReadDir(proxyDir)
|
|
if err != nil {
|
|
if os.IsNotExist(err) {
|
|
return nil
|
|
}
|
|
return fmt.Errorf("Failed reading proxies dir %q: %s", proxyDir, 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 proxy file %v", fi.Name())
|
|
continue
|
|
}
|
|
|
|
// Open the file for reading
|
|
file := filepath.Join(proxyDir, fi.Name())
|
|
fh, err := os.Open(file)
|
|
if err != nil {
|
|
return fmt.Errorf("failed opening proxy file %q: %s", file, err)
|
|
}
|
|
|
|
// Read the contents into a buffer
|
|
buf, err := ioutil.ReadAll(fh)
|
|
fh.Close()
|
|
if err != nil {
|
|
return fmt.Errorf("failed reading proxy file %q: %s", file, err)
|
|
}
|
|
|
|
// Try decoding the proxy definition
|
|
var p persistedProxy
|
|
if err := json.Unmarshal(buf, &p); err != nil {
|
|
a.logger.Printf("[ERR] agent: Failed decoding proxy file %q: %s", file, err)
|
|
continue
|
|
}
|
|
proxyID := p.Proxy.ProxyService.ID
|
|
|
|
if a.State.Proxy(proxyID) != nil {
|
|
// Purge previously persisted proxy. This allows config to be preferred
|
|
// over services persisted from the API.
|
|
a.logger.Printf("[DEBUG] agent: proxy %q exists, not restoring from %q",
|
|
proxyID, file)
|
|
if err := a.purgeProxy(proxyID); err != nil {
|
|
return fmt.Errorf("failed purging proxy %q: %s", proxyID, err)
|
|
}
|
|
} else {
|
|
a.logger.Printf("[DEBUG] agent: restored proxy definition %q from %q",
|
|
proxyID, file)
|
|
if err := a.AddProxy(p.Proxy, false, p.ProxyToken); err != nil {
|
|
return fmt.Errorf("failed adding proxy %q: %s", proxyID, err)
|
|
}
|
|
}
|
|
}
|
|
return nil
|
|
}
|
|
|
|
// unloadProxies will deregister all proxies known to the local agent.
|
|
func (a *Agent) unloadProxies() error {
|
|
for id := range a.State.Proxies() {
|
|
if err := a.RemoveProxy(id, false); err != nil {
|
|
return fmt.Errorf("Failed deregistering proxy '%s': %s", id, err)
|
|
}
|
|
}
|
|
return nil
|
|
}
|
|
|
|
// 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()
|
|
}
|
|
|
|
// restoreCheckState is used to reset the health state based on a snapshot.
|
|
// This is done after we finish the reload to avoid any unnecessary flaps
|
|
// in health state and potential session invalidations.
|
|
func (a *Agent) restoreCheckState(snap map[types.CheckID]*structs.HealthCheck) {
|
|
for id, check := range snap {
|
|
a.State.UpdateCheck(id, check.Status, check.Output)
|
|
}
|
|
}
|
|
|
|
// 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)
|
|
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)
|
|
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) ReloadConfig(newCfg *config.RuntimeConfig) error {
|
|
// Bulk update the services and checks
|
|
a.PauseSync()
|
|
defer a.ResumeSync()
|
|
|
|
// Snapshot the current state, and restore it afterwards
|
|
snap := a.snapshotCheckState()
|
|
defer a.restoreCheckState(snap)
|
|
|
|
// First unload all checks, services, and metadata. This lets us begin the reload
|
|
// with a clean slate.
|
|
if err := a.unloadProxies(); err != nil {
|
|
return fmt.Errorf("Failed unloading proxies: %s", err)
|
|
}
|
|
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 service/check definitions and metadata.
|
|
if err := a.loadServices(newCfg); err != nil {
|
|
return fmt.Errorf("Failed reloading services: %s", err)
|
|
}
|
|
if err := a.loadProxies(newCfg); err != nil {
|
|
return fmt.Errorf("Failed reloading proxies: %s", err)
|
|
}
|
|
if err := a.loadChecks(newCfg); 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)
|
|
}
|
|
|
|
// Update filtered metrics
|
|
metrics.UpdateFilter(newCfg.Telemetry.AllowedPrefixes,
|
|
newCfg.Telemetry.BlockedPrefixes)
|
|
|
|
a.State.SetDiscardCheckOutput(newCfg.DiscardCheckOutput)
|
|
|
|
return nil
|
|
}
|
|
|
|
// 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() {
|
|
a.cache.RegisterType(cachetype.ConnectCARootName, &cachetype.ConnectCARoot{
|
|
RPC: a.delegate,
|
|
}, &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.delegate,
|
|
Cache: a.cache,
|
|
}, &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.delegate,
|
|
}, &cache.RegisterOptions{
|
|
// Maintain a blocking query, retry dropped connections quickly
|
|
Refresh: true,
|
|
RefreshTimer: 0 * time.Second,
|
|
RefreshTimeout: 10 * time.Minute,
|
|
})
|
|
}
|
|
|
|
// defaultProxyCommand returns the default Connect managed proxy command.
|
|
func defaultProxyCommand(agentCfg *config.RuntimeConfig) ([]string, error) {
|
|
// Get the path to the current exectuable. This is cached once by the
|
|
// library so this is effectively just a variable read.
|
|
execPath, err := os.Executable()
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
|
|
// "consul connect proxy" default value for managed daemon proxy
|
|
cmd := []string{execPath, "connect", "proxy"}
|
|
|
|
if agentCfg != nil && agentCfg.LogLevel != "INFO" {
|
|
cmd = append(cmd, "-log-level", agentCfg.LogLevel)
|
|
}
|
|
return cmd, nil
|
|
}
|