2519 lines
75 KiB
Go
2519 lines
75 KiB
Go
package client
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import (
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"errors"
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"fmt"
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"io/ioutil"
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"log"
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"net"
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"net/rpc"
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"os"
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"path/filepath"
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"sort"
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"strconv"
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"strings"
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"sync"
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"time"
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metrics "github.com/armon/go-metrics"
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consulapi "github.com/hashicorp/consul/api"
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hclog "github.com/hashicorp/go-hclog"
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multierror "github.com/hashicorp/go-multierror"
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consulApi "github.com/hashicorp/nomad/client/consul"
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cstructs "github.com/hashicorp/nomad/client/structs"
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hstats "github.com/hashicorp/nomad/helper/stats"
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nconfig "github.com/hashicorp/nomad/nomad/structs/config"
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vaultapi "github.com/hashicorp/vault/api"
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"github.com/boltdb/bolt"
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"github.com/hashicorp/consul/lib"
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"github.com/hashicorp/nomad/client/allocdir"
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"github.com/hashicorp/nomad/client/allocrunner"
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"github.com/hashicorp/nomad/client/config"
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"github.com/hashicorp/nomad/client/servers"
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"github.com/hashicorp/nomad/client/state"
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"github.com/hashicorp/nomad/client/stats"
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"github.com/hashicorp/nomad/client/vaultclient"
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"github.com/hashicorp/nomad/command/agent/consul"
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"github.com/hashicorp/nomad/helper"
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"github.com/hashicorp/nomad/helper/pool"
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"github.com/hashicorp/nomad/helper/tlsutil"
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"github.com/hashicorp/nomad/helper/uuid"
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"github.com/hashicorp/nomad/nomad/structs"
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"github.com/shirou/gopsutil/host"
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)
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const (
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// clientRPCCache controls how long we keep an idle connection
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// open to a server
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clientRPCCache = 5 * time.Minute
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// clientMaxStreams controls how many idle streams we keep
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// open to a server
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clientMaxStreams = 2
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// datacenterQueryLimit searches through up to this many adjacent
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// datacenters looking for the Nomad server service.
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datacenterQueryLimit = 9
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// registerRetryIntv is minimum interval on which we retry
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// registration. We pick a value between this and 2x this.
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registerRetryIntv = 15 * time.Second
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// getAllocRetryIntv is minimum interval on which we retry
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// to fetch allocations. We pick a value between this and 2x this.
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getAllocRetryIntv = 30 * time.Second
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// devModeRetryIntv is the retry interval used for development
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devModeRetryIntv = time.Second
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// stateSnapshotIntv is how often the client snapshots state
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stateSnapshotIntv = 60 * time.Second
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// initialHeartbeatStagger is used to stagger the interval between
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// starting and the initial heartbeat. After the initial heartbeat,
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// we switch to using the TTL specified by the servers.
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initialHeartbeatStagger = 10 * time.Second
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// nodeUpdateRetryIntv is how often the client checks for updates to the
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// node attributes or meta map.
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nodeUpdateRetryIntv = 5 * time.Second
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// allocSyncIntv is the batching period of allocation updates before they
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// are synced with the server.
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allocSyncIntv = 200 * time.Millisecond
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// allocSyncRetryIntv is the interval on which we retry updating
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// the status of the allocation
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allocSyncRetryIntv = 5 * time.Second
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)
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// ClientStatsReporter exposes all the APIs related to resource usage of a Nomad
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// Client
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type ClientStatsReporter interface {
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// GetAllocStats returns the AllocStatsReporter for the passed allocation.
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// If it does not exist an error is reported.
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GetAllocStats(allocID string) (allocrunner.AllocStatsReporter, error)
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// LatestHostStats returns the latest resource usage stats for the host
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LatestHostStats() *stats.HostStats
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}
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// Client is used to implement the client interaction with Nomad. Clients
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// are expected to register as a schedulable node to the servers, and to
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// run allocations as determined by the servers.
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type Client struct {
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config *config.Config
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start time.Time
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// stateDB is used to efficiently store client state.
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stateDB *bolt.DB
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// configCopy is a copy that should be passed to alloc-runners.
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configCopy *config.Config
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configLock sync.RWMutex
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logger *log.Logger
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connPool *pool.ConnPool
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// tlsWrap is used to wrap outbound connections using TLS. It should be
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// accessed using the lock.
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tlsWrap tlsutil.RegionWrapper
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tlsWrapLock sync.RWMutex
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// servers is the list of nomad servers
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servers *servers.Manager
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// heartbeat related times for tracking how often to heartbeat
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lastHeartbeat time.Time
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heartbeatTTL time.Duration
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haveHeartbeated bool
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heartbeatLock sync.Mutex
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// triggerDiscoveryCh triggers Consul discovery; see triggerDiscovery
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triggerDiscoveryCh chan struct{}
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// triggerNodeUpdate triggers the client to mark the Node as changed and
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// update it.
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triggerNodeUpdate chan struct{}
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// triggerEmitNodeEvent sends an event and triggers the client to update the
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// server for the node event
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triggerEmitNodeEvent chan *structs.NodeEvent
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// rpcRetryCh is closed when there an event such as server discovery or a
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// successful RPC occurring happens such that a retry should happen. Access
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// should only occur via the getter method
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rpcRetryCh chan struct{}
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rpcRetryLock sync.Mutex
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// allocs maps alloc IDs to their AllocRunner. This map includes all
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// AllocRunners - running and GC'd - until the server GCs them.
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allocs map[string]*allocrunner.AllocRunner
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allocLock sync.RWMutex
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// allocUpdates stores allocations that need to be synced to the server.
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allocUpdates chan *structs.Allocation
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// consulService is Nomad's custom Consul client for managing services
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// and checks.
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consulService consulApi.ConsulServiceAPI
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// consulCatalog is the subset of Consul's Catalog API Nomad uses.
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consulCatalog consul.CatalogAPI
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// HostStatsCollector collects host resource usage stats
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hostStatsCollector *stats.HostStatsCollector
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shutdown bool
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shutdownCh chan struct{}
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shutdownLock sync.Mutex
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// vaultClient is used to interact with Vault for token and secret renewals
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vaultClient vaultclient.VaultClient
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// garbageCollector is used to garbage collect terminal allocations present
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// in the node automatically
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garbageCollector *AllocGarbageCollector
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// clientACLResolver holds the ACL resolution state
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clientACLResolver
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// rpcServer is used to serve RPCs by the local agent.
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rpcServer *rpc.Server
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endpoints rpcEndpoints
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streamingRpcs *structs.StreamingRpcRegistry
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// baseLabels are used when emitting tagged metrics. All client metrics will
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// have these tags, and optionally more.
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baseLabels []metrics.Label
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}
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var (
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// noServersErr is returned by the RPC method when the client has no
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// configured servers. This is used to trigger Consul discovery if
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// enabled.
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noServersErr = errors.New("no servers")
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)
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// NewClient is used to create a new client from the given configuration
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func NewClient(cfg *config.Config, consulCatalog consul.CatalogAPI, consulService consulApi.ConsulServiceAPI) (*Client, error) {
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// Create the tls wrapper
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var tlsWrap tlsutil.RegionWrapper
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if cfg.TLSConfig.EnableRPC {
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tw, err := tlsutil.NewTLSConfiguration(cfg.TLSConfig, true, true)
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if err != nil {
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return nil, err
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}
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tlsWrap, err = tw.OutgoingTLSWrapper()
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if err != nil {
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return nil, err
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}
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}
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// Create the logger
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logger := cfg.Logger.ResetNamed("")
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// Create the client
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c := &Client{
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config: cfg,
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consulCatalog: consulCatalog,
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consulService: consulService,
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start: time.Now(),
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connPool: pool.NewPool(logger, clientRPCCache, clientMaxStreams, tlsWrap),
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tlsWrap: tlsWrap,
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streamingRpcs: structs.NewStreamingRpcRegistry(),
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logger: logger.StandardLogger(&hclog.StandardLoggerOptions{InferLevels: true}),
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allocs: make(map[string]*allocrunner.AllocRunner),
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allocUpdates: make(chan *structs.Allocation, 64),
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shutdownCh: make(chan struct{}),
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triggerDiscoveryCh: make(chan struct{}),
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triggerNodeUpdate: make(chan struct{}, 8),
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triggerEmitNodeEvent: make(chan *structs.NodeEvent, 8),
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}
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// Initialize the server manager
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c.servers = servers.New(c.logger, c.shutdownCh, c)
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// Initialize the client
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if err := c.init(); err != nil {
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return nil, fmt.Errorf("failed to initialize client: %v", err)
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}
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// Setup the clients RPC server
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c.setupClientRpc()
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// Initialize the ACL state
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if err := c.clientACLResolver.init(); err != nil {
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return nil, fmt.Errorf("failed to initialize ACL state: %v", err)
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}
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// Add the stats collector
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statsCollector := stats.NewHostStatsCollector(c.logger, c.config.AllocDir)
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c.hostStatsCollector = statsCollector
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// Add the garbage collector
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gcConfig := &GCConfig{
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MaxAllocs: cfg.GCMaxAllocs,
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DiskUsageThreshold: cfg.GCDiskUsageThreshold,
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InodeUsageThreshold: cfg.GCInodeUsageThreshold,
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Interval: cfg.GCInterval,
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ParallelDestroys: cfg.GCParallelDestroys,
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ReservedDiskMB: cfg.Node.Reserved.DiskMB,
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}
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c.garbageCollector = NewAllocGarbageCollector(c.logger, statsCollector, c, gcConfig)
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go c.garbageCollector.Run()
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// Setup the node
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if err := c.setupNode(); err != nil {
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return nil, fmt.Errorf("node setup failed: %v", err)
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}
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// Store the config copy before restoring state but after it has been
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// initialized.
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c.configLock.Lock()
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c.configCopy = c.config.Copy()
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c.configLock.Unlock()
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fingerprintManager := NewFingerprintManager(c.GetConfig, c.configCopy.Node,
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c.shutdownCh, c.updateNodeFromFingerprint, c.updateNodeFromDriver,
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c.logger)
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// Fingerprint the node and scan for drivers
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if err := fingerprintManager.Run(); err != nil {
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return nil, fmt.Errorf("fingerprinting failed: %v", err)
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}
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// Setup the reserved resources
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c.reservePorts()
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// Set the preconfigured list of static servers
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c.configLock.RLock()
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if len(c.configCopy.Servers) > 0 {
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if _, err := c.setServersImpl(c.configCopy.Servers, true); err != nil {
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c.logger.Printf("[WARN] client: None of the configured servers are valid: %v", err)
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}
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}
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c.configLock.RUnlock()
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// Setup Consul discovery if enabled
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if c.configCopy.ConsulConfig.ClientAutoJoin != nil && *c.configCopy.ConsulConfig.ClientAutoJoin {
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go c.consulDiscovery()
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if c.servers.NumServers() == 0 {
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// No configured servers; trigger discovery manually
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c.triggerDiscoveryCh <- struct{}{}
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}
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}
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// Setup the vault client for token and secret renewals
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if err := c.setupVaultClient(); err != nil {
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return nil, fmt.Errorf("failed to setup vault client: %v", err)
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}
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// Restore the state
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if err := c.restoreState(); err != nil {
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c.logger.Printf("[ERR] client: failed to restore state: %v", err)
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c.logger.Printf("[ERR] client: Nomad is unable to start due to corrupt state. "+
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"The safest way to proceed is to manually stop running task processes "+
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"and remove Nomad's state (%q) and alloc (%q) directories before "+
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"restarting. Lost allocations will be rescheduled.",
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c.config.StateDir, c.config.AllocDir)
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c.logger.Printf("[ERR] client: Corrupt state is often caused by a bug. Please " +
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"report as much information as possible to " +
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"https://github.com/hashicorp/nomad/issues")
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return nil, fmt.Errorf("failed to restore state")
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}
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// Register and then start heartbeating to the servers.
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go c.registerAndHeartbeat()
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// Begin periodic snapshotting of state.
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go c.periodicSnapshot()
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// Begin syncing allocations to the server
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go c.allocSync()
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// Start the client!
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go c.run()
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// Start collecting stats
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go c.emitStats()
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c.logger.Printf("[INFO] client: Node ID %q", c.NodeID())
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return c, nil
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}
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// init is used to initialize the client and perform any setup
|
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// needed before we begin starting its various components.
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func (c *Client) init() error {
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// Ensure the state dir exists if we have one
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if c.config.StateDir != "" {
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if err := os.MkdirAll(c.config.StateDir, 0700); err != nil {
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return fmt.Errorf("failed creating state dir: %s", err)
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}
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} else {
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// Otherwise make a temp directory to use.
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p, err := ioutil.TempDir("", "NomadClient")
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if err != nil {
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return fmt.Errorf("failed creating temporary directory for the StateDir: %v", err)
|
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}
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p, err = filepath.EvalSymlinks(p)
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if err != nil {
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return fmt.Errorf("failed to find temporary directory for the StateDir: %v", err)
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}
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c.config.StateDir = p
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}
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c.logger.Printf("[INFO] client: using state directory %v", c.config.StateDir)
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|
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// Create or open the state database
|
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db, err := bolt.Open(filepath.Join(c.config.StateDir, "state.db"), 0600, nil)
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if err != nil {
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return fmt.Errorf("failed to create state database: %v", err)
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}
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c.stateDB = db
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|
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// Ensure the alloc dir exists if we have one
|
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if c.config.AllocDir != "" {
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if err := os.MkdirAll(c.config.AllocDir, 0711); err != nil {
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return fmt.Errorf("failed creating alloc dir: %s", err)
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}
|
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} else {
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// Otherwise make a temp directory to use.
|
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p, err := ioutil.TempDir("", "NomadClient")
|
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if err != nil {
|
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return fmt.Errorf("failed creating temporary directory for the AllocDir: %v", err)
|
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}
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|
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p, err = filepath.EvalSymlinks(p)
|
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if err != nil {
|
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return fmt.Errorf("failed to find temporary directory for the AllocDir: %v", err)
|
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}
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|
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// Change the permissions to have the execute bit
|
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if err := os.Chmod(p, 0711); err != nil {
|
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return fmt.Errorf("failed to change directory permissions for the AllocDir: %v", err)
|
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}
|
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c.config.AllocDir = p
|
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}
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|
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c.logger.Printf("[INFO] client: using alloc directory %v", c.config.AllocDir)
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return nil
|
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}
|
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|
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// reloadTLSConnections allows a client to reload its TLS configuration on the
|
|
// fly
|
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func (c *Client) reloadTLSConnections(newConfig *nconfig.TLSConfig) error {
|
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var tlsWrap tlsutil.RegionWrapper
|
|
if newConfig != nil && newConfig.EnableRPC {
|
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tw, err := tlsutil.NewTLSConfiguration(newConfig, true, true)
|
|
if err != nil {
|
|
return err
|
|
}
|
|
|
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twWrap, err := tw.OutgoingTLSWrapper()
|
|
if err != nil {
|
|
return err
|
|
}
|
|
tlsWrap = twWrap
|
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}
|
|
|
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// Store the new tls wrapper.
|
|
c.tlsWrapLock.Lock()
|
|
c.tlsWrap = tlsWrap
|
|
c.tlsWrapLock.Unlock()
|
|
|
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// Keep the client configuration up to date as we use configuration values to
|
|
// decide on what type of connections to accept
|
|
c.configLock.Lock()
|
|
c.config.TLSConfig = newConfig
|
|
c.configLock.Unlock()
|
|
|
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c.connPool.ReloadTLS(tlsWrap)
|
|
|
|
return nil
|
|
}
|
|
|
|
// Reload allows a client to reload its configuration on the fly
|
|
func (c *Client) Reload(newConfig *config.Config) error {
|
|
shouldReloadTLS, err := tlsutil.ShouldReloadRPCConnections(c.config.TLSConfig, newConfig.TLSConfig)
|
|
if err != nil {
|
|
c.logger.Printf("[ERR] nomad: error parsing server TLS configuration: %s", err)
|
|
return err
|
|
}
|
|
|
|
if shouldReloadTLS {
|
|
return c.reloadTLSConnections(newConfig.TLSConfig)
|
|
}
|
|
|
|
return nil
|
|
}
|
|
|
|
// Leave is used to prepare the client to leave the cluster
|
|
func (c *Client) Leave() error {
|
|
// TODO
|
|
return nil
|
|
}
|
|
|
|
// GetConfig returns the config of the client
|
|
func (c *Client) GetConfig() *config.Config {
|
|
c.configLock.Lock()
|
|
defer c.configLock.Unlock()
|
|
return c.configCopy
|
|
}
|
|
|
|
// Datacenter returns the datacenter for the given client
|
|
func (c *Client) Datacenter() string {
|
|
return c.config.Node.Datacenter
|
|
}
|
|
|
|
// Region returns the region for the given client
|
|
func (c *Client) Region() string {
|
|
return c.config.Region
|
|
}
|
|
|
|
// NodeID returns the node ID for the given client
|
|
func (c *Client) NodeID() string {
|
|
return c.config.Node.ID
|
|
}
|
|
|
|
// secretNodeID returns the secret node ID for the given client
|
|
func (c *Client) secretNodeID() string {
|
|
return c.config.Node.SecretID
|
|
}
|
|
|
|
// RPCMajorVersion returns the structs.ApiMajorVersion supported by the
|
|
// client.
|
|
func (c *Client) RPCMajorVersion() int {
|
|
return structs.ApiMajorVersion
|
|
}
|
|
|
|
// RPCMinorVersion returns the structs.ApiMinorVersion supported by the
|
|
// client.
|
|
func (c *Client) RPCMinorVersion() int {
|
|
return structs.ApiMinorVersion
|
|
}
|
|
|
|
// Shutdown is used to tear down the client
|
|
func (c *Client) Shutdown() error {
|
|
c.logger.Printf("[INFO] client: shutting down")
|
|
c.shutdownLock.Lock()
|
|
defer c.shutdownLock.Unlock()
|
|
|
|
if c.shutdown {
|
|
return nil
|
|
}
|
|
|
|
// Defer closing the database
|
|
defer func() {
|
|
if err := c.stateDB.Close(); err != nil {
|
|
c.logger.Printf("[ERR] client: failed to close state database on shutdown: %v", err)
|
|
}
|
|
}()
|
|
|
|
// Stop renewing tokens and secrets
|
|
if c.vaultClient != nil {
|
|
c.vaultClient.Stop()
|
|
}
|
|
|
|
// Stop Garbage collector
|
|
c.garbageCollector.Stop()
|
|
|
|
// Destroy all the running allocations.
|
|
if c.config.DevMode {
|
|
var wg sync.WaitGroup
|
|
for _, ar := range c.getAllocRunners() {
|
|
wg.Add(1)
|
|
go func(ar *allocrunner.AllocRunner) {
|
|
ar.Destroy()
|
|
<-ar.WaitCh()
|
|
wg.Done()
|
|
}(ar)
|
|
}
|
|
wg.Wait()
|
|
}
|
|
|
|
c.shutdown = true
|
|
close(c.shutdownCh)
|
|
c.connPool.Shutdown()
|
|
return c.saveState()
|
|
}
|
|
|
|
// Stats is used to return statistics for debugging and insight
|
|
// for various sub-systems
|
|
func (c *Client) Stats() map[string]map[string]string {
|
|
c.heartbeatLock.Lock()
|
|
defer c.heartbeatLock.Unlock()
|
|
stats := map[string]map[string]string{
|
|
"client": {
|
|
"node_id": c.NodeID(),
|
|
"known_servers": strings.Join(c.GetServers(), ","),
|
|
"num_allocations": strconv.Itoa(c.NumAllocs()),
|
|
"last_heartbeat": fmt.Sprintf("%v", time.Since(c.lastHeartbeat)),
|
|
"heartbeat_ttl": fmt.Sprintf("%v", c.heartbeatTTL),
|
|
},
|
|
"runtime": hstats.RuntimeStats(),
|
|
}
|
|
return stats
|
|
}
|
|
|
|
// CollectAllocation garbage collects a single allocation on a node. Returns
|
|
// true if alloc was found and garbage collected; otherwise false.
|
|
func (c *Client) CollectAllocation(allocID string) bool {
|
|
return c.garbageCollector.Collect(allocID)
|
|
}
|
|
|
|
// CollectAllAllocs garbage collects all allocations on a node in the terminal
|
|
// state
|
|
func (c *Client) CollectAllAllocs() {
|
|
c.garbageCollector.CollectAll()
|
|
}
|
|
|
|
// Node returns the locally registered node
|
|
func (c *Client) Node() *structs.Node {
|
|
c.configLock.RLock()
|
|
defer c.configLock.RUnlock()
|
|
return c.configCopy.Node
|
|
}
|
|
|
|
// StatsReporter exposes the various APIs related resource usage of a Nomad
|
|
// client
|
|
func (c *Client) StatsReporter() ClientStatsReporter {
|
|
return c
|
|
}
|
|
|
|
func (c *Client) GetAllocStats(allocID string) (allocrunner.AllocStatsReporter, error) {
|
|
c.allocLock.RLock()
|
|
defer c.allocLock.RUnlock()
|
|
ar, ok := c.allocs[allocID]
|
|
if !ok {
|
|
return nil, structs.NewErrUnknownAllocation(allocID)
|
|
}
|
|
return ar.StatsReporter(), nil
|
|
}
|
|
|
|
// HostStats returns all the stats related to a Nomad client
|
|
func (c *Client) LatestHostStats() *stats.HostStats {
|
|
return c.hostStatsCollector.Stats()
|
|
}
|
|
|
|
// ValidateMigrateToken verifies that a token is for a specific client and
|
|
// allocation, and has been created by a trusted party that has privileged
|
|
// knowledge of the client's secret identifier
|
|
func (c *Client) ValidateMigrateToken(allocID, migrateToken string) bool {
|
|
if !c.config.ACLEnabled {
|
|
return true
|
|
}
|
|
|
|
return structs.CompareMigrateToken(allocID, c.secretNodeID(), migrateToken)
|
|
}
|
|
|
|
// GetAllocFS returns the AllocFS interface for the alloc dir of an allocation
|
|
func (c *Client) GetAllocFS(allocID string) (allocdir.AllocDirFS, error) {
|
|
c.allocLock.RLock()
|
|
defer c.allocLock.RUnlock()
|
|
|
|
ar, ok := c.allocs[allocID]
|
|
if !ok {
|
|
return nil, structs.NewErrUnknownAllocation(allocID)
|
|
}
|
|
return ar.GetAllocDir(), nil
|
|
}
|
|
|
|
// GetClientAlloc returns the allocation from the client
|
|
func (c *Client) GetClientAlloc(allocID string) (*structs.Allocation, error) {
|
|
all := c.allAllocs()
|
|
alloc, ok := all[allocID]
|
|
if !ok {
|
|
return nil, structs.NewErrUnknownAllocation(allocID)
|
|
}
|
|
return alloc, nil
|
|
}
|
|
|
|
// GetServers returns the list of nomad servers this client is aware of.
|
|
func (c *Client) GetServers() []string {
|
|
endpoints := c.servers.GetServers()
|
|
res := make([]string, len(endpoints))
|
|
for i := range endpoints {
|
|
res[i] = endpoints[i].String()
|
|
}
|
|
sort.Strings(res)
|
|
return res
|
|
}
|
|
|
|
// SetServers sets a new list of nomad servers to connect to. As long as one
|
|
// server is resolvable no error is returned.
|
|
func (c *Client) SetServers(in []string) (int, error) {
|
|
return c.setServersImpl(in, false)
|
|
}
|
|
|
|
// setServersImpl sets a new list of nomad servers to connect to. If force is
|
|
// set, we add the server to the internal serverlist even if the server could not
|
|
// be pinged. An error is returned if no endpoints were valid when non-forcing.
|
|
//
|
|
// Force should be used when setting the servers from the initial configuration
|
|
// since the server may be starting up in parallel and initial pings may fail.
|
|
func (c *Client) setServersImpl(in []string, force bool) (int, error) {
|
|
var mu sync.Mutex
|
|
var wg sync.WaitGroup
|
|
var merr multierror.Error
|
|
|
|
endpoints := make([]*servers.Server, 0, len(in))
|
|
wg.Add(len(in))
|
|
|
|
for _, s := range in {
|
|
go func(srv string) {
|
|
defer wg.Done()
|
|
addr, err := resolveServer(srv)
|
|
if err != nil {
|
|
c.logger.Printf("[DEBUG] client: ignoring server %s due to resolution error: %v", srv, err)
|
|
mu.Lock()
|
|
merr.Errors = append(merr.Errors, err)
|
|
mu.Unlock()
|
|
return
|
|
}
|
|
|
|
// Try to ping to check if it is a real server
|
|
if err := c.Ping(addr); err != nil {
|
|
mu.Lock()
|
|
merr.Errors = append(merr.Errors, fmt.Errorf("Server at address %s failed ping: %v", addr, err))
|
|
mu.Unlock()
|
|
|
|
// If we are forcing the setting of the servers, inject it to
|
|
// the serverlist even if we can't ping immediately.
|
|
if !force {
|
|
return
|
|
}
|
|
}
|
|
|
|
mu.Lock()
|
|
endpoints = append(endpoints, &servers.Server{Addr: addr})
|
|
mu.Unlock()
|
|
}(s)
|
|
}
|
|
|
|
wg.Wait()
|
|
|
|
// Only return errors if no servers are valid
|
|
if len(endpoints) == 0 {
|
|
if len(merr.Errors) > 0 {
|
|
return 0, merr.ErrorOrNil()
|
|
}
|
|
return 0, noServersErr
|
|
}
|
|
|
|
c.servers.SetServers(endpoints)
|
|
return len(endpoints), nil
|
|
}
|
|
|
|
// restoreState is used to restore our state from the data dir
|
|
func (c *Client) restoreState() error {
|
|
if c.config.DevMode {
|
|
return nil
|
|
}
|
|
|
|
// COMPAT: Remove in 0.7.0
|
|
// 0.6.0 transitioned from individual state files to a single bolt-db.
|
|
// The upgrade path is to:
|
|
// Check if old state exists
|
|
// If so, restore from that and delete old state
|
|
// Restore using state database
|
|
|
|
// Allocs holds the IDs of the allocations being restored
|
|
var allocs []string
|
|
|
|
// Upgrading tracks whether this is a pre 0.6.0 upgrade path
|
|
var upgrading bool
|
|
|
|
// Scan the directory
|
|
allocDir := filepath.Join(c.config.StateDir, "alloc")
|
|
list, err := ioutil.ReadDir(allocDir)
|
|
if err != nil && !os.IsNotExist(err) {
|
|
return fmt.Errorf("failed to list alloc state: %v", err)
|
|
} else if err == nil && len(list) != 0 {
|
|
upgrading = true
|
|
for _, entry := range list {
|
|
allocs = append(allocs, entry.Name())
|
|
}
|
|
} else {
|
|
// Normal path
|
|
err := c.stateDB.View(func(tx *bolt.Tx) error {
|
|
allocs, err = state.GetAllAllocationIDs(tx)
|
|
if err != nil {
|
|
return fmt.Errorf("failed to list allocations: %v", err)
|
|
}
|
|
return nil
|
|
})
|
|
if err != nil {
|
|
return err
|
|
}
|
|
}
|
|
|
|
// Load each alloc back
|
|
var mErr multierror.Error
|
|
for _, id := range allocs {
|
|
alloc := &structs.Allocation{ID: id}
|
|
|
|
// don't worry about blocking/migrating when restoring
|
|
watcher := allocrunner.NoopPrevAlloc{}
|
|
|
|
c.configLock.RLock()
|
|
ar := allocrunner.NewAllocRunner(c.logger, c.configCopy.Copy(), c.stateDB, c.updateAllocStatus, alloc, c.vaultClient, c.consulService, watcher)
|
|
c.configLock.RUnlock()
|
|
|
|
c.allocLock.Lock()
|
|
c.allocs[id] = ar
|
|
c.allocLock.Unlock()
|
|
|
|
if err := ar.RestoreState(); err != nil {
|
|
c.logger.Printf("[ERR] client: failed to restore state for alloc %q: %v", id, err)
|
|
mErr.Errors = append(mErr.Errors, err)
|
|
} else {
|
|
go ar.Run()
|
|
|
|
if upgrading {
|
|
if err := ar.SaveState(); err != nil {
|
|
c.logger.Printf("[WARN] client: initial save state for alloc %q failed: %v", id, err)
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
// Delete all the entries
|
|
if upgrading {
|
|
if err := os.RemoveAll(allocDir); err != nil {
|
|
mErr.Errors = append(mErr.Errors, err)
|
|
}
|
|
}
|
|
|
|
return mErr.ErrorOrNil()
|
|
}
|
|
|
|
// saveState is used to snapshot our state into the data dir.
|
|
func (c *Client) saveState() error {
|
|
if c.config.DevMode {
|
|
return nil
|
|
}
|
|
|
|
var wg sync.WaitGroup
|
|
var l sync.Mutex
|
|
var mErr multierror.Error
|
|
runners := c.getAllocRunners()
|
|
wg.Add(len(runners))
|
|
|
|
for id, ar := range runners {
|
|
go func(id string, ar *allocrunner.AllocRunner) {
|
|
err := ar.SaveState()
|
|
if err != nil {
|
|
c.logger.Printf("[ERR] client: failed to save state for alloc %q: %v", id, err)
|
|
l.Lock()
|
|
multierror.Append(&mErr, err)
|
|
l.Unlock()
|
|
}
|
|
wg.Done()
|
|
}(id, ar)
|
|
}
|
|
|
|
wg.Wait()
|
|
return mErr.ErrorOrNil()
|
|
}
|
|
|
|
// getAllocRunners returns a snapshot of the current set of alloc runners.
|
|
func (c *Client) getAllocRunners() map[string]*allocrunner.AllocRunner {
|
|
c.allocLock.RLock()
|
|
defer c.allocLock.RUnlock()
|
|
runners := make(map[string]*allocrunner.AllocRunner, len(c.allocs))
|
|
for id, ar := range c.allocs {
|
|
runners[id] = ar
|
|
}
|
|
return runners
|
|
}
|
|
|
|
// NumAllocs returns the number of un-GC'd allocs this client has. Used to
|
|
// fulfill the AllocCounter interface for the GC.
|
|
func (c *Client) NumAllocs() int {
|
|
n := 0
|
|
c.allocLock.RLock()
|
|
for _, a := range c.allocs {
|
|
if !a.IsDestroyed() {
|
|
n++
|
|
}
|
|
}
|
|
c.allocLock.RUnlock()
|
|
return n
|
|
}
|
|
|
|
// nodeID restores, or generates if necessary, a unique node ID and SecretID.
|
|
// The node ID is, if available, a persistent unique ID. The secret ID is a
|
|
// high-entropy random UUID.
|
|
func (c *Client) nodeID() (id, secret string, err error) {
|
|
var hostID string
|
|
hostInfo, err := host.Info()
|
|
if !c.config.NoHostUUID && err == nil {
|
|
if hashed, ok := helper.HashUUID(hostInfo.HostID); ok {
|
|
hostID = hashed
|
|
}
|
|
}
|
|
|
|
if hostID == "" {
|
|
// Generate a random hostID if no constant ID is available on
|
|
// this platform.
|
|
hostID = uuid.Generate()
|
|
}
|
|
|
|
// Do not persist in dev mode
|
|
if c.config.DevMode {
|
|
return hostID, uuid.Generate(), nil
|
|
}
|
|
|
|
// Attempt to read existing ID
|
|
idPath := filepath.Join(c.config.StateDir, "client-id")
|
|
idBuf, err := ioutil.ReadFile(idPath)
|
|
if err != nil && !os.IsNotExist(err) {
|
|
return "", "", err
|
|
}
|
|
|
|
// Attempt to read existing secret ID
|
|
secretPath := filepath.Join(c.config.StateDir, "secret-id")
|
|
secretBuf, err := ioutil.ReadFile(secretPath)
|
|
if err != nil && !os.IsNotExist(err) {
|
|
return "", "", err
|
|
}
|
|
|
|
// Use existing ID if any
|
|
if len(idBuf) != 0 {
|
|
id = strings.ToLower(string(idBuf))
|
|
} else {
|
|
id = hostID
|
|
|
|
// Persist the ID
|
|
if err := ioutil.WriteFile(idPath, []byte(id), 0700); err != nil {
|
|
return "", "", err
|
|
}
|
|
}
|
|
|
|
if len(secretBuf) != 0 {
|
|
secret = string(secretBuf)
|
|
} else {
|
|
// Generate new ID
|
|
secret = uuid.Generate()
|
|
|
|
// Persist the ID
|
|
if err := ioutil.WriteFile(secretPath, []byte(secret), 0700); err != nil {
|
|
return "", "", err
|
|
}
|
|
}
|
|
|
|
return id, secret, nil
|
|
}
|
|
|
|
// setupNode is used to setup the initial node
|
|
func (c *Client) setupNode() error {
|
|
node := c.config.Node
|
|
if node == nil {
|
|
node = &structs.Node{}
|
|
c.config.Node = node
|
|
}
|
|
// Generate an ID and secret for the node
|
|
id, secretID, err := c.nodeID()
|
|
if err != nil {
|
|
return fmt.Errorf("node ID setup failed: %v", err)
|
|
}
|
|
|
|
node.ID = id
|
|
node.SecretID = secretID
|
|
if node.Attributes == nil {
|
|
node.Attributes = make(map[string]string)
|
|
}
|
|
if node.Links == nil {
|
|
node.Links = make(map[string]string)
|
|
}
|
|
if node.Drivers == nil {
|
|
node.Drivers = make(map[string]*structs.DriverInfo)
|
|
}
|
|
if node.Meta == nil {
|
|
node.Meta = make(map[string]string)
|
|
}
|
|
if node.Resources == nil {
|
|
node.Resources = &structs.Resources{}
|
|
}
|
|
if node.Reserved == nil {
|
|
node.Reserved = &structs.Resources{}
|
|
}
|
|
if node.Datacenter == "" {
|
|
node.Datacenter = "dc1"
|
|
}
|
|
if node.Name == "" {
|
|
node.Name, _ = os.Hostname()
|
|
}
|
|
if node.Name == "" {
|
|
node.Name = node.ID
|
|
}
|
|
node.Status = structs.NodeStatusInit
|
|
return nil
|
|
}
|
|
|
|
// reservePorts is used to reserve ports on the fingerprinted network devices.
|
|
func (c *Client) reservePorts() {
|
|
c.configLock.RLock()
|
|
defer c.configLock.RUnlock()
|
|
global := c.config.GloballyReservedPorts
|
|
if len(global) == 0 {
|
|
return
|
|
}
|
|
|
|
node := c.config.Node
|
|
networks := node.Resources.Networks
|
|
reservedIndex := make(map[string]*structs.NetworkResource, len(networks))
|
|
for _, resNet := range node.Reserved.Networks {
|
|
reservedIndex[resNet.IP] = resNet
|
|
}
|
|
|
|
// Go through each network device and reserve ports on it.
|
|
for _, net := range networks {
|
|
res, ok := reservedIndex[net.IP]
|
|
if !ok {
|
|
res = net.Copy()
|
|
res.MBits = 0
|
|
reservedIndex[net.IP] = res
|
|
}
|
|
|
|
for _, portVal := range global {
|
|
p := structs.Port{Value: portVal}
|
|
res.ReservedPorts = append(res.ReservedPorts, p)
|
|
}
|
|
}
|
|
|
|
// Clear the reserved networks.
|
|
if node.Reserved == nil {
|
|
node.Reserved = new(structs.Resources)
|
|
} else {
|
|
node.Reserved.Networks = nil
|
|
}
|
|
|
|
// Restore the reserved networks
|
|
for _, net := range reservedIndex {
|
|
node.Reserved.Networks = append(node.Reserved.Networks, net)
|
|
}
|
|
|
|
// Make the changes available to the config copy.
|
|
c.configCopy = c.config.Copy()
|
|
}
|
|
|
|
// updateNodeFromFingerprint updates the node with the result of
|
|
// fingerprinting the node from the diff that was created
|
|
func (c *Client) updateNodeFromFingerprint(response *cstructs.FingerprintResponse) *structs.Node {
|
|
c.configLock.Lock()
|
|
defer c.configLock.Unlock()
|
|
|
|
nodeHasChanged := false
|
|
|
|
for name, newVal := range response.Attributes {
|
|
oldVal := c.config.Node.Attributes[name]
|
|
if oldVal == newVal {
|
|
continue
|
|
}
|
|
|
|
nodeHasChanged = true
|
|
if newVal == "" {
|
|
delete(c.config.Node.Attributes, name)
|
|
} else {
|
|
c.config.Node.Attributes[name] = newVal
|
|
}
|
|
}
|
|
|
|
// update node links and resources from the diff created from
|
|
// fingerprinting
|
|
for name, newVal := range response.Links {
|
|
oldVal := c.config.Node.Links[name]
|
|
if oldVal == newVal {
|
|
continue
|
|
}
|
|
|
|
nodeHasChanged = true
|
|
if newVal == "" {
|
|
delete(c.config.Node.Links, name)
|
|
} else {
|
|
c.config.Node.Links[name] = newVal
|
|
}
|
|
}
|
|
|
|
if response.Resources != nil && !resourcesAreEqual(c.config.Node.Resources, response.Resources) {
|
|
nodeHasChanged = true
|
|
c.config.Node.Resources.Merge(response.Resources)
|
|
}
|
|
|
|
if nodeHasChanged {
|
|
c.updateNodeLocked()
|
|
}
|
|
|
|
return c.configCopy.Node
|
|
}
|
|
|
|
// updateNodeFromDriver receives either a fingerprint of the driver or its
|
|
// health and merges this into a single DriverInfo object
|
|
func (c *Client) updateNodeFromDriver(name string, fingerprint, health *structs.DriverInfo) *structs.Node {
|
|
c.configLock.Lock()
|
|
defer c.configLock.Unlock()
|
|
|
|
var hasChanged bool
|
|
|
|
hadDriver := c.config.Node.Drivers[name] != nil
|
|
if fingerprint != nil {
|
|
if !hadDriver {
|
|
// If the driver info has not yet been set, do that here
|
|
hasChanged = true
|
|
c.config.Node.Drivers[name] = fingerprint
|
|
for attrName, newVal := range fingerprint.Attributes {
|
|
c.config.Node.Attributes[attrName] = newVal
|
|
}
|
|
} else {
|
|
// The driver info has already been set, fix it up
|
|
if c.config.Node.Drivers[name].Detected != fingerprint.Detected {
|
|
hasChanged = true
|
|
c.config.Node.Drivers[name].Detected = fingerprint.Detected
|
|
}
|
|
|
|
for attrName, newVal := range fingerprint.Attributes {
|
|
oldVal := c.config.Node.Drivers[name].Attributes[attrName]
|
|
if oldVal == newVal {
|
|
continue
|
|
}
|
|
|
|
hasChanged = true
|
|
if newVal == "" {
|
|
delete(c.config.Node.Attributes, attrName)
|
|
} else {
|
|
c.config.Node.Attributes[attrName] = newVal
|
|
}
|
|
}
|
|
}
|
|
|
|
// COMPAT Remove in Nomad 0.10
|
|
// We maintain the driver enabled attribute until all drivers expose
|
|
// their attributes as DriverInfo
|
|
driverName := fmt.Sprintf("driver.%s", name)
|
|
if fingerprint.Detected {
|
|
c.config.Node.Attributes[driverName] = "1"
|
|
} else {
|
|
delete(c.config.Node.Attributes, driverName)
|
|
}
|
|
}
|
|
|
|
if health != nil {
|
|
if !hadDriver {
|
|
hasChanged = true
|
|
if info, ok := c.config.Node.Drivers[name]; !ok {
|
|
c.config.Node.Drivers[name] = health
|
|
} else {
|
|
info.MergeHealthCheck(health)
|
|
}
|
|
} else {
|
|
oldVal := c.config.Node.Drivers[name]
|
|
if health.HealthCheckEquals(oldVal) {
|
|
// Make sure we accurately reflect the last time a health check has been
|
|
// performed for the driver.
|
|
oldVal.UpdateTime = health.UpdateTime
|
|
} else {
|
|
hasChanged = true
|
|
|
|
// Only emit an event if the health status has changed after node
|
|
// initial startup (the health description will not get populated until
|
|
// a health check has run; the initial status is equal to whether the
|
|
// node is detected or not).
|
|
if health.Healthy != oldVal.Healthy && health.HealthDescription != "" {
|
|
event := &structs.NodeEvent{
|
|
Subsystem: "Driver",
|
|
Message: health.HealthDescription,
|
|
Timestamp: time.Now(),
|
|
Details: map[string]string{"driver": name},
|
|
}
|
|
c.triggerNodeEvent(event)
|
|
}
|
|
|
|
// Update the node with the latest information
|
|
c.config.Node.Drivers[name].MergeHealthCheck(health)
|
|
}
|
|
}
|
|
}
|
|
|
|
if hasChanged {
|
|
c.config.Node.Drivers[name].UpdateTime = time.Now()
|
|
c.updateNodeLocked()
|
|
}
|
|
|
|
return c.configCopy.Node
|
|
}
|
|
|
|
// resourcesAreEqual is a temporary function to compare whether resources are
|
|
// equal. We can use this until we change fingerprinters to set pointers on a
|
|
// return type.
|
|
func resourcesAreEqual(first, second *structs.Resources) bool {
|
|
if first.CPU != second.CPU {
|
|
return false
|
|
}
|
|
if first.MemoryMB != second.MemoryMB {
|
|
return false
|
|
}
|
|
if first.DiskMB != second.DiskMB {
|
|
return false
|
|
}
|
|
if first.IOPS != second.IOPS {
|
|
return false
|
|
}
|
|
if len(first.Networks) != len(second.Networks) {
|
|
return false
|
|
}
|
|
for i, e := range first.Networks {
|
|
if len(second.Networks) < i {
|
|
return false
|
|
}
|
|
f := second.Networks[i]
|
|
if !e.Equals(f) {
|
|
return false
|
|
}
|
|
}
|
|
return true
|
|
}
|
|
|
|
// retryIntv calculates a retry interval value given the base
|
|
func (c *Client) retryIntv(base time.Duration) time.Duration {
|
|
if c.config.DevMode {
|
|
return devModeRetryIntv
|
|
}
|
|
return base + lib.RandomStagger(base)
|
|
}
|
|
|
|
// registerAndHeartbeat is a long lived goroutine used to register the client
|
|
// and then start heartbeating to the server.
|
|
func (c *Client) registerAndHeartbeat() {
|
|
// Register the node
|
|
c.retryRegisterNode()
|
|
|
|
// Start watching changes for node changes
|
|
go c.watchNodeUpdates()
|
|
|
|
// Start watching for emitting node events
|
|
go c.watchNodeEvents()
|
|
|
|
// Setup the heartbeat timer, for the initial registration
|
|
// we want to do this quickly. We want to do it extra quickly
|
|
// in development mode.
|
|
var heartbeat <-chan time.Time
|
|
if c.config.DevMode {
|
|
heartbeat = time.After(0)
|
|
} else {
|
|
heartbeat = time.After(lib.RandomStagger(initialHeartbeatStagger))
|
|
}
|
|
|
|
for {
|
|
select {
|
|
case <-c.rpcRetryWatcher():
|
|
case <-heartbeat:
|
|
case <-c.shutdownCh:
|
|
return
|
|
}
|
|
|
|
if err := c.updateNodeStatus(); err != nil {
|
|
// The servers have changed such that this node has not been
|
|
// registered before
|
|
if strings.Contains(err.Error(), "node not found") {
|
|
// Re-register the node
|
|
c.logger.Printf("[INFO] client: re-registering node")
|
|
c.retryRegisterNode()
|
|
heartbeat = time.After(lib.RandomStagger(initialHeartbeatStagger))
|
|
} else {
|
|
intv := c.getHeartbeatRetryIntv(err)
|
|
c.logger.Printf("[ERR] client: heartbeating failed. Retrying in %v: %v", intv, err)
|
|
heartbeat = time.After(intv)
|
|
|
|
// If heartbeating fails, trigger Consul discovery
|
|
c.triggerDiscovery()
|
|
}
|
|
} else {
|
|
c.heartbeatLock.Lock()
|
|
heartbeat = time.After(c.heartbeatTTL)
|
|
c.heartbeatLock.Unlock()
|
|
}
|
|
}
|
|
}
|
|
|
|
// getHeartbeatRetryIntv is used to retrieve the time to wait before attempting
|
|
// another heartbeat.
|
|
func (c *Client) getHeartbeatRetryIntv(err error) time.Duration {
|
|
if c.config.DevMode {
|
|
return devModeRetryIntv
|
|
}
|
|
|
|
// Collect the useful heartbeat info
|
|
c.heartbeatLock.Lock()
|
|
haveHeartbeated := c.haveHeartbeated
|
|
last := c.lastHeartbeat
|
|
ttl := c.heartbeatTTL
|
|
c.heartbeatLock.Unlock()
|
|
|
|
// If we haven't even successfully heartbeated once or there is no leader
|
|
// treat it as a registration. In the case that there is a leadership loss,
|
|
// we will have our heartbeat timer reset to a much larger threshold, so
|
|
// do not put unnecessary pressure on the new leader.
|
|
if !haveHeartbeated || err == structs.ErrNoLeader {
|
|
return c.retryIntv(registerRetryIntv)
|
|
}
|
|
|
|
// Determine how much time we have left to heartbeat
|
|
left := last.Add(ttl).Sub(time.Now())
|
|
|
|
// Logic for retrying is:
|
|
// * Do not retry faster than once a second
|
|
// * Do not retry less that once every 30 seconds
|
|
// * If we have missed the heartbeat by more than 30 seconds, start to use
|
|
// the absolute time since we do not want to retry indefinitely
|
|
switch {
|
|
case left < -30*time.Second:
|
|
// Make left the absolute value so we delay and jitter properly.
|
|
left *= -1
|
|
case left < 0:
|
|
return time.Second + lib.RandomStagger(time.Second)
|
|
default:
|
|
}
|
|
|
|
stagger := lib.RandomStagger(left)
|
|
switch {
|
|
case stagger < time.Second:
|
|
return time.Second + lib.RandomStagger(time.Second)
|
|
case stagger > 30*time.Second:
|
|
return 25*time.Second + lib.RandomStagger(5*time.Second)
|
|
default:
|
|
return stagger
|
|
}
|
|
}
|
|
|
|
// periodicSnapshot is a long lived goroutine used to periodically snapshot the
|
|
// state of the client
|
|
func (c *Client) periodicSnapshot() {
|
|
// Create a snapshot timer
|
|
snapshot := time.After(stateSnapshotIntv)
|
|
|
|
for {
|
|
select {
|
|
case <-snapshot:
|
|
snapshot = time.After(stateSnapshotIntv)
|
|
if err := c.saveState(); err != nil {
|
|
c.logger.Printf("[ERR] client: failed to save state: %v", err)
|
|
}
|
|
|
|
case <-c.shutdownCh:
|
|
return
|
|
}
|
|
}
|
|
}
|
|
|
|
// run is a long lived goroutine used to run the client
|
|
func (c *Client) run() {
|
|
// Watch for changes in allocations
|
|
allocUpdates := make(chan *allocUpdates, 8)
|
|
go c.watchAllocations(allocUpdates)
|
|
|
|
for {
|
|
select {
|
|
case update := <-allocUpdates:
|
|
c.runAllocs(update)
|
|
|
|
case <-c.shutdownCh:
|
|
return
|
|
}
|
|
}
|
|
}
|
|
|
|
// submitNodeEvents is used to submit a client-side node event. Examples of
|
|
// these kinds of events include when a driver moves from healthy to unhealthy
|
|
// (and vice versa)
|
|
func (c *Client) submitNodeEvents(events []*structs.NodeEvent) error {
|
|
nodeID := c.NodeID()
|
|
nodeEvents := map[string][]*structs.NodeEvent{
|
|
nodeID: events,
|
|
}
|
|
req := structs.EmitNodeEventsRequest{
|
|
NodeEvents: nodeEvents,
|
|
WriteRequest: structs.WriteRequest{Region: c.Region()},
|
|
}
|
|
var resp structs.EmitNodeEventsResponse
|
|
if err := c.RPC("Node.EmitEvents", &req, &resp); err != nil {
|
|
return fmt.Errorf("Emitting node events failed: %v", err)
|
|
}
|
|
return nil
|
|
}
|
|
|
|
// watchNodeEvents is a handler which receives node events and on a interval
|
|
// and submits them in batch format to the server
|
|
func (c *Client) watchNodeEvents() {
|
|
// batchEvents stores events that have yet to be published
|
|
var batchEvents []*structs.NodeEvent
|
|
|
|
// Create and drain the timer
|
|
timer := time.NewTimer(0)
|
|
timer.Stop()
|
|
select {
|
|
case <-timer.C:
|
|
default:
|
|
}
|
|
defer timer.Stop()
|
|
|
|
for {
|
|
select {
|
|
case event := <-c.triggerEmitNodeEvent:
|
|
if l := len(batchEvents); l <= structs.MaxRetainedNodeEvents {
|
|
batchEvents = append(batchEvents, event)
|
|
} else {
|
|
// Drop the oldest event
|
|
c.logger.Printf("[WARN] client: dropping node event: %v", batchEvents[0])
|
|
batchEvents = append(batchEvents[1:], event)
|
|
}
|
|
timer.Reset(c.retryIntv(nodeUpdateRetryIntv))
|
|
case <-timer.C:
|
|
if err := c.submitNodeEvents(batchEvents); err != nil {
|
|
c.logger.Printf("[ERR] client: submitting node events failed: %v", err)
|
|
timer.Reset(c.retryIntv(nodeUpdateRetryIntv))
|
|
} else {
|
|
// Reset the events since we successfully sent them.
|
|
batchEvents = []*structs.NodeEvent{}
|
|
}
|
|
case <-c.shutdownCh:
|
|
return
|
|
}
|
|
}
|
|
}
|
|
|
|
// triggerNodeEvent triggers a emit node event
|
|
func (c *Client) triggerNodeEvent(nodeEvent *structs.NodeEvent) {
|
|
select {
|
|
case c.triggerEmitNodeEvent <- nodeEvent:
|
|
// emit node event goroutine was released to execute
|
|
default:
|
|
// emit node event goroutine was already running
|
|
}
|
|
}
|
|
|
|
// retryRegisterNode is used to register the node or update the registration and
|
|
// retry in case of failure.
|
|
func (c *Client) retryRegisterNode() {
|
|
for {
|
|
err := c.registerNode()
|
|
if err == nil {
|
|
// Registered!
|
|
return
|
|
}
|
|
|
|
if err == noServersErr {
|
|
c.logger.Print("[DEBUG] client: registration waiting on servers")
|
|
c.triggerDiscovery()
|
|
} else {
|
|
c.logger.Printf("[ERR] client: registration failure: %v", err)
|
|
}
|
|
select {
|
|
case <-c.rpcRetryWatcher():
|
|
case <-time.After(c.retryIntv(registerRetryIntv)):
|
|
case <-c.shutdownCh:
|
|
return
|
|
}
|
|
}
|
|
}
|
|
|
|
// registerNode is used to register the node or update the registration
|
|
func (c *Client) registerNode() error {
|
|
node := c.Node()
|
|
req := structs.NodeRegisterRequest{
|
|
Node: node,
|
|
WriteRequest: structs.WriteRequest{Region: c.Region()},
|
|
}
|
|
var resp structs.NodeUpdateResponse
|
|
if err := c.RPC("Node.Register", &req, &resp); err != nil {
|
|
return err
|
|
}
|
|
|
|
// Update the node status to ready after we register.
|
|
c.configLock.Lock()
|
|
node.Status = structs.NodeStatusReady
|
|
c.config.Node.Status = structs.NodeStatusReady
|
|
c.configLock.Unlock()
|
|
|
|
c.logger.Printf("[INFO] client: node registration complete")
|
|
if len(resp.EvalIDs) != 0 {
|
|
c.logger.Printf("[DEBUG] client: %d evaluations triggered by node registration", len(resp.EvalIDs))
|
|
}
|
|
|
|
c.heartbeatLock.Lock()
|
|
defer c.heartbeatLock.Unlock()
|
|
c.lastHeartbeat = time.Now()
|
|
c.heartbeatTTL = resp.HeartbeatTTL
|
|
return nil
|
|
}
|
|
|
|
// updateNodeStatus is used to heartbeat and update the status of the node
|
|
func (c *Client) updateNodeStatus() error {
|
|
start := time.Now()
|
|
req := structs.NodeUpdateStatusRequest{
|
|
NodeID: c.NodeID(),
|
|
Status: structs.NodeStatusReady,
|
|
WriteRequest: structs.WriteRequest{Region: c.Region()},
|
|
}
|
|
var resp structs.NodeUpdateResponse
|
|
if err := c.RPC("Node.UpdateStatus", &req, &resp); err != nil {
|
|
c.triggerDiscovery()
|
|
return fmt.Errorf("failed to update status: %v", err)
|
|
}
|
|
end := time.Now()
|
|
|
|
if len(resp.EvalIDs) != 0 {
|
|
c.logger.Printf("[DEBUG] client: %d evaluations triggered by node update", len(resp.EvalIDs))
|
|
}
|
|
|
|
// Update the last heartbeat and the new TTL, capturing the old values
|
|
c.heartbeatLock.Lock()
|
|
last := c.lastHeartbeat
|
|
oldTTL := c.heartbeatTTL
|
|
haveHeartbeated := c.haveHeartbeated
|
|
c.lastHeartbeat = time.Now()
|
|
c.heartbeatTTL = resp.HeartbeatTTL
|
|
c.haveHeartbeated = true
|
|
c.heartbeatLock.Unlock()
|
|
c.logger.Printf("[TRACE] client: next heartbeat in %v", resp.HeartbeatTTL)
|
|
|
|
if resp.Index != 0 {
|
|
c.logger.Printf("[DEBUG] client: state updated to %s", req.Status)
|
|
|
|
// We have potentially missed our TTL log how delayed we were
|
|
if haveHeartbeated {
|
|
c.logger.Printf("[WARN] client: heartbeat missed (request took %v). Heartbeat TTL was %v and heartbeated after %v",
|
|
end.Sub(start), oldTTL, time.Since(last))
|
|
}
|
|
}
|
|
|
|
// Update the number of nodes in the cluster so we can adjust our server
|
|
// rebalance rate.
|
|
c.servers.SetNumNodes(resp.NumNodes)
|
|
|
|
// Convert []*NodeServerInfo to []*servers.Server
|
|
nomadServers := make([]*servers.Server, 0, len(resp.Servers))
|
|
for _, s := range resp.Servers {
|
|
addr, err := resolveServer(s.RPCAdvertiseAddr)
|
|
if err != nil {
|
|
c.logger.Printf("[WARN] client: ignoring invalid server %q: %v", s.RPCAdvertiseAddr, err)
|
|
continue
|
|
}
|
|
e := &servers.Server{DC: s.Datacenter, Addr: addr}
|
|
nomadServers = append(nomadServers, e)
|
|
}
|
|
if len(nomadServers) == 0 {
|
|
return fmt.Errorf("heartbeat response returned no valid servers")
|
|
}
|
|
c.servers.SetServers(nomadServers)
|
|
|
|
// Begin polling Consul if there is no Nomad leader. We could be
|
|
// heartbeating to a Nomad server that is in the minority of a
|
|
// partition of the Nomad server quorum, but this Nomad Agent still
|
|
// has connectivity to the existing majority of Nomad Servers, but
|
|
// only if it queries Consul.
|
|
if resp.LeaderRPCAddr == "" {
|
|
c.triggerDiscovery()
|
|
}
|
|
|
|
return nil
|
|
}
|
|
|
|
// updateAllocStatus is used to update the status of an allocation
|
|
func (c *Client) updateAllocStatus(alloc *structs.Allocation) {
|
|
if alloc.Terminated() {
|
|
// Terminated, mark for GC if we're still tracking this alloc
|
|
// runner. If it's not being tracked that means the server has
|
|
// already GC'd it (see removeAlloc).
|
|
c.allocLock.RLock()
|
|
ar, ok := c.allocs[alloc.ID]
|
|
c.allocLock.RUnlock()
|
|
|
|
if ok {
|
|
c.garbageCollector.MarkForCollection(ar)
|
|
|
|
// Trigger a GC in case we're over thresholds and just
|
|
// waiting for eligible allocs.
|
|
c.garbageCollector.Trigger()
|
|
}
|
|
}
|
|
|
|
// Strip all the information that can be reconstructed at the server. Only
|
|
// send the fields that are updatable by the client.
|
|
stripped := new(structs.Allocation)
|
|
stripped.ID = alloc.ID
|
|
stripped.NodeID = c.NodeID()
|
|
stripped.TaskStates = alloc.TaskStates
|
|
stripped.ClientStatus = alloc.ClientStatus
|
|
stripped.ClientDescription = alloc.ClientDescription
|
|
stripped.DeploymentStatus = alloc.DeploymentStatus
|
|
|
|
select {
|
|
case c.allocUpdates <- stripped:
|
|
case <-c.shutdownCh:
|
|
}
|
|
}
|
|
|
|
// allocSync is a long lived function that batches allocation updates to the
|
|
// server.
|
|
func (c *Client) allocSync() {
|
|
staggered := false
|
|
syncTicker := time.NewTicker(allocSyncIntv)
|
|
updates := make(map[string]*structs.Allocation)
|
|
for {
|
|
select {
|
|
case <-c.shutdownCh:
|
|
syncTicker.Stop()
|
|
return
|
|
case alloc := <-c.allocUpdates:
|
|
// Batch the allocation updates until the timer triggers.
|
|
updates[alloc.ID] = alloc
|
|
case <-syncTicker.C:
|
|
// Fast path if there are no updates
|
|
if len(updates) == 0 {
|
|
continue
|
|
}
|
|
|
|
sync := make([]*structs.Allocation, 0, len(updates))
|
|
for _, alloc := range updates {
|
|
sync = append(sync, alloc)
|
|
}
|
|
|
|
// Send to server.
|
|
args := structs.AllocUpdateRequest{
|
|
Alloc: sync,
|
|
WriteRequest: structs.WriteRequest{Region: c.Region()},
|
|
}
|
|
|
|
var resp structs.GenericResponse
|
|
if err := c.RPC("Node.UpdateAlloc", &args, &resp); err != nil {
|
|
c.logger.Printf("[ERR] client: failed to update allocations: %v", err)
|
|
syncTicker.Stop()
|
|
syncTicker = time.NewTicker(c.retryIntv(allocSyncRetryIntv))
|
|
staggered = true
|
|
} else {
|
|
updates = make(map[string]*structs.Allocation)
|
|
if staggered {
|
|
syncTicker.Stop()
|
|
syncTicker = time.NewTicker(allocSyncIntv)
|
|
staggered = false
|
|
}
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
// allocUpdates holds the results of receiving updated allocations from the
|
|
// servers.
|
|
type allocUpdates struct {
|
|
// pulled is the set of allocations that were downloaded from the servers.
|
|
pulled map[string]*structs.Allocation
|
|
|
|
// filtered is the set of allocations that were not pulled because their
|
|
// AllocModifyIndex didn't change.
|
|
filtered map[string]struct{}
|
|
|
|
// migrateTokens are a list of tokens necessary for when clients pull data
|
|
// from authorized volumes
|
|
migrateTokens map[string]string
|
|
}
|
|
|
|
// watchAllocations is used to scan for updates to allocations
|
|
func (c *Client) watchAllocations(updates chan *allocUpdates) {
|
|
// The request and response for getting the map of allocations that should
|
|
// be running on the Node to their AllocModifyIndex which is incremented
|
|
// when the allocation is updated by the servers.
|
|
req := structs.NodeSpecificRequest{
|
|
NodeID: c.NodeID(),
|
|
SecretID: c.secretNodeID(),
|
|
QueryOptions: structs.QueryOptions{
|
|
Region: c.Region(),
|
|
AllowStale: true,
|
|
},
|
|
}
|
|
var resp structs.NodeClientAllocsResponse
|
|
|
|
// The request and response for pulling down the set of allocations that are
|
|
// new, or updated server side.
|
|
allocsReq := structs.AllocsGetRequest{
|
|
QueryOptions: structs.QueryOptions{
|
|
Region: c.Region(),
|
|
AllowStale: true,
|
|
},
|
|
}
|
|
var allocsResp structs.AllocsGetResponse
|
|
|
|
OUTER:
|
|
for {
|
|
// Get the allocation modify index map, blocking for updates. We will
|
|
// use this to determine exactly what allocations need to be downloaded
|
|
// in full.
|
|
resp = structs.NodeClientAllocsResponse{}
|
|
err := c.RPC("Node.GetClientAllocs", &req, &resp)
|
|
if err != nil {
|
|
// Shutdown often causes EOF errors, so check for shutdown first
|
|
select {
|
|
case <-c.shutdownCh:
|
|
return
|
|
default:
|
|
}
|
|
|
|
// COMPAT: Remove in 0.6. This is to allow the case in which the
|
|
// servers are not fully upgraded before the clients register. This
|
|
// can cause the SecretID to be lost
|
|
if strings.Contains(err.Error(), "node secret ID does not match") {
|
|
c.logger.Printf("[DEBUG] client: re-registering node as there was a secret ID mismatch: %v", err)
|
|
c.retryRegisterNode()
|
|
} else if err != noServersErr {
|
|
c.logger.Printf("[ERR] client: failed to query for node allocations: %v", err)
|
|
}
|
|
retry := c.retryIntv(getAllocRetryIntv)
|
|
select {
|
|
case <-c.rpcRetryWatcher():
|
|
continue
|
|
case <-time.After(retry):
|
|
continue
|
|
case <-c.shutdownCh:
|
|
return
|
|
}
|
|
}
|
|
|
|
// Check for shutdown
|
|
select {
|
|
case <-c.shutdownCh:
|
|
return
|
|
default:
|
|
}
|
|
|
|
// Filter all allocations whose AllocModifyIndex was not incremented.
|
|
// These are the allocations who have either not been updated, or whose
|
|
// updates are a result of the client sending an update for the alloc.
|
|
// This lets us reduce the network traffic to the server as we don't
|
|
// need to pull all the allocations.
|
|
var pull []string
|
|
filtered := make(map[string]struct{})
|
|
runners := c.getAllocRunners()
|
|
var pullIndex uint64
|
|
for allocID, modifyIndex := range resp.Allocs {
|
|
// Pull the allocation if we don't have an alloc runner for the
|
|
// allocation or if the alloc runner requires an updated allocation.
|
|
runner, ok := runners[allocID]
|
|
|
|
if !ok || runner.ShouldUpdate(modifyIndex) {
|
|
// Only pull allocs that are required. Filtered
|
|
// allocs might be at a higher index, so ignore
|
|
// it.
|
|
if modifyIndex > pullIndex {
|
|
pullIndex = modifyIndex
|
|
}
|
|
pull = append(pull, allocID)
|
|
} else {
|
|
filtered[allocID] = struct{}{}
|
|
}
|
|
}
|
|
|
|
// Pull the allocations that passed filtering.
|
|
allocsResp.Allocs = nil
|
|
var pulledAllocs map[string]*structs.Allocation
|
|
if len(pull) != 0 {
|
|
// Pull the allocations that need to be updated.
|
|
allocsReq.AllocIDs = pull
|
|
allocsReq.MinQueryIndex = pullIndex - 1
|
|
allocsResp = structs.AllocsGetResponse{}
|
|
if err := c.RPC("Alloc.GetAllocs", &allocsReq, &allocsResp); err != nil {
|
|
c.logger.Printf("[ERR] client: failed to query updated allocations: %v", err)
|
|
retry := c.retryIntv(getAllocRetryIntv)
|
|
select {
|
|
case <-c.rpcRetryWatcher():
|
|
continue
|
|
case <-time.After(retry):
|
|
continue
|
|
case <-c.shutdownCh:
|
|
return
|
|
}
|
|
}
|
|
|
|
// Ensure that we received all the allocations we wanted
|
|
pulledAllocs = make(map[string]*structs.Allocation, len(allocsResp.Allocs))
|
|
for _, alloc := range allocsResp.Allocs {
|
|
pulledAllocs[alloc.ID] = alloc
|
|
}
|
|
|
|
for _, desiredID := range pull {
|
|
if _, ok := pulledAllocs[desiredID]; !ok {
|
|
// We didn't get everything we wanted. Do not update the
|
|
// MinQueryIndex, sleep and then retry.
|
|
wait := c.retryIntv(2 * time.Second)
|
|
select {
|
|
case <-time.After(wait):
|
|
// Wait for the server we contact to receive the
|
|
// allocations
|
|
continue OUTER
|
|
case <-c.shutdownCh:
|
|
return
|
|
}
|
|
}
|
|
}
|
|
|
|
// Check for shutdown
|
|
select {
|
|
case <-c.shutdownCh:
|
|
return
|
|
default:
|
|
}
|
|
}
|
|
|
|
c.logger.Printf("[DEBUG] client: updated allocations at index %d (total %d) (pulled %d) (filtered %d)",
|
|
resp.Index, len(resp.Allocs), len(allocsResp.Allocs), len(filtered))
|
|
|
|
// Update the query index.
|
|
if resp.Index > req.MinQueryIndex {
|
|
req.MinQueryIndex = resp.Index
|
|
}
|
|
|
|
// Push the updates.
|
|
update := &allocUpdates{
|
|
filtered: filtered,
|
|
pulled: pulledAllocs,
|
|
migrateTokens: resp.MigrateTokens,
|
|
}
|
|
select {
|
|
case updates <- update:
|
|
case <-c.shutdownCh:
|
|
return
|
|
}
|
|
}
|
|
}
|
|
|
|
// updateNode updates the Node copy and triggers the client to send the updated
|
|
// Node to the server. This should be done while the caller holds the
|
|
// configLock lock.
|
|
func (c *Client) updateNodeLocked() {
|
|
// Update the config copy.
|
|
node := c.config.Node.Copy()
|
|
c.configCopy.Node = node
|
|
|
|
select {
|
|
case c.triggerNodeUpdate <- struct{}{}:
|
|
// Node update goroutine was released to execute
|
|
default:
|
|
// Node update goroutine was already running
|
|
}
|
|
}
|
|
|
|
// watchNodeUpdates blocks until it is edge triggered. Once triggered,
|
|
// it will update the client node copy and re-register the node.
|
|
func (c *Client) watchNodeUpdates() {
|
|
var hasChanged bool
|
|
timer := time.NewTimer(c.retryIntv(nodeUpdateRetryIntv))
|
|
defer timer.Stop()
|
|
|
|
for {
|
|
select {
|
|
case <-timer.C:
|
|
c.logger.Printf("[DEBUG] client: state changed, updating node and re-registering.")
|
|
c.retryRegisterNode()
|
|
hasChanged = false
|
|
case <-c.triggerNodeUpdate:
|
|
if hasChanged {
|
|
continue
|
|
}
|
|
hasChanged = true
|
|
timer.Reset(c.retryIntv(nodeUpdateRetryIntv))
|
|
case <-c.shutdownCh:
|
|
return
|
|
}
|
|
}
|
|
}
|
|
|
|
// runAllocs is invoked when we get an updated set of allocations
|
|
func (c *Client) runAllocs(update *allocUpdates) {
|
|
// Get the existing allocs
|
|
c.allocLock.RLock()
|
|
exist := make([]*structs.Allocation, 0, len(c.allocs))
|
|
for _, ar := range c.allocs {
|
|
exist = append(exist, ar.Alloc())
|
|
}
|
|
c.allocLock.RUnlock()
|
|
|
|
// Diff the existing and updated allocations
|
|
diff := diffAllocs(exist, update)
|
|
c.logger.Printf("[DEBUG] client: %#v", diff)
|
|
|
|
// Remove the old allocations
|
|
for _, remove := range diff.removed {
|
|
c.removeAlloc(remove)
|
|
}
|
|
|
|
// Update the existing allocations
|
|
for _, update := range diff.updated {
|
|
if err := c.updateAlloc(update.exist, update.updated); err != nil {
|
|
c.logger.Printf("[ERR] client: failed to update alloc %q: %v",
|
|
update.exist.ID, err)
|
|
}
|
|
}
|
|
|
|
// Make room for new allocations before running
|
|
if err := c.garbageCollector.MakeRoomFor(diff.added); err != nil {
|
|
c.logger.Printf("[ERR] client: error making room for new allocations: %v", err)
|
|
}
|
|
|
|
// Start the new allocations
|
|
for _, add := range diff.added {
|
|
migrateToken := update.migrateTokens[add.ID]
|
|
if err := c.addAlloc(add, migrateToken); err != nil {
|
|
c.logger.Printf("[ERR] client: failed to add alloc '%s': %v",
|
|
add.ID, err)
|
|
}
|
|
}
|
|
|
|
// Trigger the GC once more now that new allocs are started that could
|
|
// have caused thresholds to be exceeded
|
|
c.garbageCollector.Trigger()
|
|
}
|
|
|
|
// removeAlloc is invoked when we should remove an allocation because it has
|
|
// been removed by the server.
|
|
func (c *Client) removeAlloc(alloc *structs.Allocation) {
|
|
c.allocLock.Lock()
|
|
ar, ok := c.allocs[alloc.ID]
|
|
if !ok {
|
|
c.allocLock.Unlock()
|
|
c.logger.Printf("[WARN] client: missing context for alloc '%s'", alloc.ID)
|
|
return
|
|
}
|
|
|
|
// Stop tracking alloc runner as it's been GC'd by the server
|
|
delete(c.allocs, alloc.ID)
|
|
c.allocLock.Unlock()
|
|
|
|
// Ensure the GC has a reference and then collect. Collecting through the GC
|
|
// applies rate limiting
|
|
c.garbageCollector.MarkForCollection(ar)
|
|
|
|
// GC immediately since the server has GC'd it
|
|
go c.garbageCollector.Collect(alloc.ID)
|
|
}
|
|
|
|
// updateAlloc is invoked when we should update an allocation
|
|
func (c *Client) updateAlloc(exist, update *structs.Allocation) error {
|
|
c.allocLock.RLock()
|
|
ar, ok := c.allocs[exist.ID]
|
|
c.allocLock.RUnlock()
|
|
if !ok {
|
|
c.logger.Printf("[WARN] client: missing context for alloc '%s'", exist.ID)
|
|
return nil
|
|
}
|
|
|
|
ar.Update(update)
|
|
return nil
|
|
}
|
|
|
|
// addAlloc is invoked when we should add an allocation
|
|
func (c *Client) addAlloc(alloc *structs.Allocation, migrateToken string) error {
|
|
// Check if we already have an alloc runner
|
|
c.allocLock.Lock()
|
|
defer c.allocLock.Unlock()
|
|
if _, ok := c.allocs[alloc.ID]; ok {
|
|
c.logger.Printf("[DEBUG]: client: dropping duplicate add allocation request: %q", alloc.ID)
|
|
return nil
|
|
}
|
|
|
|
// get the previous alloc runner - if one exists - for the
|
|
// blocking/migrating watcher
|
|
var prevAR *allocrunner.AllocRunner
|
|
if alloc.PreviousAllocation != "" {
|
|
prevAR = c.allocs[alloc.PreviousAllocation]
|
|
}
|
|
|
|
c.configLock.RLock()
|
|
prevAlloc := allocrunner.NewAllocWatcher(alloc, prevAR, c, c.configCopy, c.logger, migrateToken)
|
|
|
|
// Copy the config since the node can be swapped out as it is being updated.
|
|
// The long term fix is to pass in the config and node separately and then
|
|
// we don't have to do a copy.
|
|
ar := allocrunner.NewAllocRunner(c.logger, c.configCopy.Copy(), c.stateDB, c.updateAllocStatus, alloc, c.vaultClient, c.consulService, prevAlloc)
|
|
c.configLock.RUnlock()
|
|
|
|
// Store the alloc runner.
|
|
c.allocs[alloc.ID] = ar
|
|
|
|
if err := ar.SaveState(); err != nil {
|
|
c.logger.Printf("[WARN] client: initial save state for alloc %q failed: %v", alloc.ID, err)
|
|
}
|
|
|
|
go ar.Run()
|
|
return nil
|
|
}
|
|
|
|
// setupVaultClient creates an object to periodically renew tokens and secrets
|
|
// with vault.
|
|
func (c *Client) setupVaultClient() error {
|
|
var err error
|
|
c.vaultClient, err = vaultclient.NewVaultClient(c.config.VaultConfig, c.logger, c.deriveToken)
|
|
if err != nil {
|
|
return err
|
|
}
|
|
|
|
if c.vaultClient == nil {
|
|
c.logger.Printf("[ERR] client: failed to create vault client")
|
|
return fmt.Errorf("failed to create vault client")
|
|
}
|
|
|
|
// Start renewing tokens and secrets
|
|
c.vaultClient.Start()
|
|
|
|
return nil
|
|
}
|
|
|
|
// deriveToken takes in an allocation and a set of tasks and derives vault
|
|
// tokens for each of the tasks, unwraps all of them using the supplied vault
|
|
// client and returns a map of unwrapped tokens, indexed by the task name.
|
|
func (c *Client) deriveToken(alloc *structs.Allocation, taskNames []string, vclient *vaultapi.Client) (map[string]string, error) {
|
|
if alloc == nil {
|
|
return nil, fmt.Errorf("nil allocation")
|
|
}
|
|
|
|
if taskNames == nil || len(taskNames) == 0 {
|
|
return nil, fmt.Errorf("missing task names")
|
|
}
|
|
|
|
group := alloc.Job.LookupTaskGroup(alloc.TaskGroup)
|
|
if group == nil {
|
|
return nil, fmt.Errorf("group name in allocation is not present in job")
|
|
}
|
|
|
|
verifiedTasks := []string{}
|
|
// Check if the given task names actually exist in the allocation
|
|
for _, taskName := range taskNames {
|
|
found := false
|
|
for _, task := range group.Tasks {
|
|
if task.Name == taskName {
|
|
found = true
|
|
}
|
|
}
|
|
if !found {
|
|
c.logger.Printf("[ERR] task %q not found in the allocation", taskName)
|
|
return nil, fmt.Errorf("task %q not found in the allocation", taskName)
|
|
}
|
|
verifiedTasks = append(verifiedTasks, taskName)
|
|
}
|
|
|
|
// DeriveVaultToken of nomad server can take in a set of tasks and
|
|
// creates tokens for all the tasks.
|
|
req := &structs.DeriveVaultTokenRequest{
|
|
NodeID: c.NodeID(),
|
|
SecretID: c.secretNodeID(),
|
|
AllocID: alloc.ID,
|
|
Tasks: verifiedTasks,
|
|
QueryOptions: structs.QueryOptions{
|
|
Region: c.Region(),
|
|
AllowStale: false,
|
|
},
|
|
}
|
|
|
|
// Derive the tokens
|
|
var resp structs.DeriveVaultTokenResponse
|
|
if err := c.RPC("Node.DeriveVaultToken", &req, &resp); err != nil {
|
|
c.logger.Printf("[ERR] client.vault: DeriveVaultToken RPC failed: %v", err)
|
|
return nil, fmt.Errorf("DeriveVaultToken RPC failed: %v", err)
|
|
}
|
|
if resp.Error != nil {
|
|
c.logger.Printf("[ERR] client.vault: failed to derive vault tokens: %v", resp.Error)
|
|
return nil, structs.NewWrappedServerError(resp.Error)
|
|
}
|
|
if resp.Tasks == nil {
|
|
c.logger.Printf("[ERR] client.vault: failed to derive vault token: invalid response")
|
|
return nil, fmt.Errorf("failed to derive vault tokens: invalid response")
|
|
}
|
|
|
|
unwrappedTokens := make(map[string]string)
|
|
|
|
// Retrieve the wrapped tokens from the response and unwrap it
|
|
for _, taskName := range verifiedTasks {
|
|
// Get the wrapped token
|
|
wrappedToken, ok := resp.Tasks[taskName]
|
|
if !ok {
|
|
c.logger.Printf("[ERR] client.vault: wrapped token missing for task %q", taskName)
|
|
return nil, fmt.Errorf("wrapped token missing for task %q", taskName)
|
|
}
|
|
|
|
// Unwrap the vault token
|
|
unwrapResp, err := vclient.Logical().Unwrap(wrappedToken)
|
|
if err != nil {
|
|
if structs.VaultUnrecoverableError.MatchString(err.Error()) {
|
|
return nil, err
|
|
}
|
|
|
|
// The error is recoverable
|
|
return nil, structs.NewRecoverableError(
|
|
fmt.Errorf("failed to unwrap the token for task %q: %v", taskName, err), true)
|
|
}
|
|
|
|
// Validate the response
|
|
var validationErr error
|
|
if unwrapResp == nil {
|
|
validationErr = fmt.Errorf("Vault returned nil secret when unwrapping")
|
|
} else if unwrapResp.Auth == nil {
|
|
validationErr = fmt.Errorf("Vault returned unwrap secret with nil Auth. Secret warnings: %v", unwrapResp.Warnings)
|
|
} else if unwrapResp.Auth.ClientToken == "" {
|
|
validationErr = fmt.Errorf("Vault returned unwrap secret with empty Auth.ClientToken. Secret warnings: %v", unwrapResp.Warnings)
|
|
}
|
|
if validationErr != nil {
|
|
c.logger.Printf("[WARN] client.vault: failed to unwrap token: %v", err)
|
|
return nil, structs.NewRecoverableError(validationErr, true)
|
|
}
|
|
|
|
// Append the unwrapped token to the return value
|
|
unwrappedTokens[taskName] = unwrapResp.Auth.ClientToken
|
|
}
|
|
|
|
return unwrappedTokens, nil
|
|
}
|
|
|
|
// triggerDiscovery causes a Consul discovery to begin (if one hasn't already)
|
|
func (c *Client) triggerDiscovery() {
|
|
select {
|
|
case c.triggerDiscoveryCh <- struct{}{}:
|
|
// Discovery goroutine was released to execute
|
|
default:
|
|
// Discovery goroutine was already running
|
|
}
|
|
}
|
|
|
|
// consulDiscovery waits for the signal to attempt server discovery via Consul.
|
|
// It's intended to be started in a goroutine. See triggerDiscovery() for
|
|
// causing consul discovery from other code locations.
|
|
func (c *Client) consulDiscovery() {
|
|
for {
|
|
select {
|
|
case <-c.triggerDiscoveryCh:
|
|
if err := c.consulDiscoveryImpl(); err != nil {
|
|
c.logger.Printf("[ERR] client.consul: error discovering nomad servers: %v", err)
|
|
}
|
|
case <-c.shutdownCh:
|
|
return
|
|
}
|
|
}
|
|
}
|
|
|
|
func (c *Client) consulDiscoveryImpl() error {
|
|
// Acquire heartbeat lock to prevent heartbeat from running
|
|
// concurrently with discovery. Concurrent execution is safe, however
|
|
// discovery is usually triggered when heartbeating has failed so
|
|
// there's no point in allowing it.
|
|
c.heartbeatLock.Lock()
|
|
defer c.heartbeatLock.Unlock()
|
|
|
|
dcs, err := c.consulCatalog.Datacenters()
|
|
if err != nil {
|
|
return fmt.Errorf("client.consul: unable to query Consul datacenters: %v", err)
|
|
}
|
|
if len(dcs) > 2 {
|
|
// Query the local DC first, then shuffle the
|
|
// remaining DCs. Future heartbeats will cause Nomad
|
|
// Clients to fixate on their local datacenter so
|
|
// it's okay to talk with remote DCs. If the no
|
|
// Nomad servers are available within
|
|
// datacenterQueryLimit, the next heartbeat will pick
|
|
// a new set of servers so it's okay.
|
|
shuffleStrings(dcs[1:])
|
|
dcs = dcs[0:lib.MinInt(len(dcs), datacenterQueryLimit)]
|
|
}
|
|
|
|
// Query for servers in this client's region only
|
|
region := c.Region()
|
|
rpcargs := structs.GenericRequest{
|
|
QueryOptions: structs.QueryOptions{
|
|
Region: region,
|
|
},
|
|
}
|
|
|
|
serviceName := c.configCopy.ConsulConfig.ServerServiceName
|
|
var mErr multierror.Error
|
|
var nomadServers servers.Servers
|
|
c.logger.Printf("[DEBUG] client.consul: bootstrap contacting following Consul DCs: %+q", dcs)
|
|
DISCOLOOP:
|
|
for _, dc := range dcs {
|
|
consulOpts := &consulapi.QueryOptions{
|
|
AllowStale: true,
|
|
Datacenter: dc,
|
|
Near: "_agent",
|
|
WaitTime: consul.DefaultQueryWaitDuration,
|
|
}
|
|
consulServices, _, err := c.consulCatalog.Service(serviceName, consul.ServiceTagRPC, consulOpts)
|
|
if err != nil {
|
|
mErr.Errors = append(mErr.Errors, fmt.Errorf("unable to query service %+q from Consul datacenter %+q: %v", serviceName, dc, err))
|
|
continue
|
|
}
|
|
|
|
for _, s := range consulServices {
|
|
port := strconv.Itoa(s.ServicePort)
|
|
addrstr := s.ServiceAddress
|
|
if addrstr == "" {
|
|
addrstr = s.Address
|
|
}
|
|
addr, err := net.ResolveTCPAddr("tcp", net.JoinHostPort(addrstr, port))
|
|
if err != nil {
|
|
mErr.Errors = append(mErr.Errors, err)
|
|
continue
|
|
}
|
|
var peers []string
|
|
if err := c.connPool.RPC(region, addr, c.RPCMajorVersion(), "Status.Peers", rpcargs, &peers); err != nil {
|
|
mErr.Errors = append(mErr.Errors, err)
|
|
continue
|
|
}
|
|
|
|
// Successfully received the Server peers list of the correct
|
|
// region
|
|
for _, p := range peers {
|
|
addr, err := net.ResolveTCPAddr("tcp", p)
|
|
if err != nil {
|
|
mErr.Errors = append(mErr.Errors, err)
|
|
}
|
|
srv := &servers.Server{Addr: addr}
|
|
nomadServers = append(nomadServers, srv)
|
|
}
|
|
if len(nomadServers) > 0 {
|
|
break DISCOLOOP
|
|
}
|
|
}
|
|
}
|
|
if len(nomadServers) == 0 {
|
|
if len(mErr.Errors) > 0 {
|
|
return mErr.ErrorOrNil()
|
|
}
|
|
return fmt.Errorf("no Nomad Servers advertising service %q in Consul datacenters: %+q", serviceName, dcs)
|
|
}
|
|
|
|
c.logger.Printf("[INFO] client.consul: discovered following Servers: %s", nomadServers)
|
|
|
|
// Fire the retry trigger if we have updated the set of servers.
|
|
if c.servers.SetServers(nomadServers) {
|
|
// Start rebalancing
|
|
c.servers.RebalanceServers()
|
|
|
|
// Notify waiting rpc calls. If a goroutine just failed an RPC call and
|
|
// isn't receiving on this chan yet they'll still retry eventually.
|
|
// This is a shortcircuit for the longer retry intervals.
|
|
c.fireRpcRetryWatcher()
|
|
}
|
|
|
|
return nil
|
|
}
|
|
|
|
// emitStats collects host resource usage stats periodically
|
|
func (c *Client) emitStats() {
|
|
// Determining NodeClass to be emitted
|
|
var emittedNodeClass string
|
|
if emittedNodeClass = c.Node().NodeClass; emittedNodeClass == "" {
|
|
emittedNodeClass = "none"
|
|
}
|
|
|
|
// Assign labels directly before emitting stats so the information expected
|
|
// is ready
|
|
c.baseLabels = []metrics.Label{
|
|
{Name: "node_id", Value: c.NodeID()},
|
|
{Name: "datacenter", Value: c.Datacenter()},
|
|
{Name: "node_class", Value: emittedNodeClass},
|
|
}
|
|
|
|
// Start collecting host stats right away and then keep collecting every
|
|
// collection interval
|
|
next := time.NewTimer(0)
|
|
defer next.Stop()
|
|
for {
|
|
select {
|
|
case <-next.C:
|
|
err := c.hostStatsCollector.Collect()
|
|
next.Reset(c.config.StatsCollectionInterval)
|
|
if err != nil {
|
|
c.logger.Printf("[WARN] client: error fetching host resource usage stats: %v", err)
|
|
continue
|
|
}
|
|
|
|
// Publish Node metrics if operator has opted in
|
|
if c.config.PublishNodeMetrics {
|
|
c.emitHostStats()
|
|
}
|
|
|
|
c.emitClientMetrics()
|
|
case <-c.shutdownCh:
|
|
return
|
|
}
|
|
}
|
|
}
|
|
|
|
// setGaugeForMemoryStats proxies metrics for memory specific statistics
|
|
func (c *Client) setGaugeForMemoryStats(nodeID string, hStats *stats.HostStats) {
|
|
if !c.config.DisableTaggedMetrics {
|
|
metrics.SetGaugeWithLabels([]string{"client", "host", "memory", "total"}, float32(hStats.Memory.Total), c.baseLabels)
|
|
metrics.SetGaugeWithLabels([]string{"client", "host", "memory", "available"}, float32(hStats.Memory.Available), c.baseLabels)
|
|
metrics.SetGaugeWithLabels([]string{"client", "host", "memory", "used"}, float32(hStats.Memory.Used), c.baseLabels)
|
|
metrics.SetGaugeWithLabels([]string{"client", "host", "memory", "free"}, float32(hStats.Memory.Free), c.baseLabels)
|
|
}
|
|
|
|
if c.config.BackwardsCompatibleMetrics {
|
|
metrics.SetGauge([]string{"client", "host", "memory", nodeID, "total"}, float32(hStats.Memory.Total))
|
|
metrics.SetGauge([]string{"client", "host", "memory", nodeID, "available"}, float32(hStats.Memory.Available))
|
|
metrics.SetGauge([]string{"client", "host", "memory", nodeID, "used"}, float32(hStats.Memory.Used))
|
|
metrics.SetGauge([]string{"client", "host", "memory", nodeID, "free"}, float32(hStats.Memory.Free))
|
|
}
|
|
}
|
|
|
|
// setGaugeForCPUStats proxies metrics for CPU specific statistics
|
|
func (c *Client) setGaugeForCPUStats(nodeID string, hStats *stats.HostStats) {
|
|
for _, cpu := range hStats.CPU {
|
|
if !c.config.DisableTaggedMetrics {
|
|
labels := append(c.baseLabels, metrics.Label{
|
|
Name: "cpu",
|
|
Value: cpu.CPU,
|
|
})
|
|
|
|
metrics.SetGaugeWithLabels([]string{"client", "host", "cpu", "total"}, float32(cpu.Total), labels)
|
|
metrics.SetGaugeWithLabels([]string{"client", "host", "cpu", "user"}, float32(cpu.User), labels)
|
|
metrics.SetGaugeWithLabels([]string{"client", "host", "cpu", "idle"}, float32(cpu.Idle), labels)
|
|
metrics.SetGaugeWithLabels([]string{"client", "host", "cpu", "system"}, float32(cpu.System), labels)
|
|
}
|
|
|
|
if c.config.BackwardsCompatibleMetrics {
|
|
metrics.SetGauge([]string{"client", "host", "cpu", nodeID, cpu.CPU, "total"}, float32(cpu.Total))
|
|
metrics.SetGauge([]string{"client", "host", "cpu", nodeID, cpu.CPU, "user"}, float32(cpu.User))
|
|
metrics.SetGauge([]string{"client", "host", "cpu", nodeID, cpu.CPU, "idle"}, float32(cpu.Idle))
|
|
metrics.SetGauge([]string{"client", "host", "cpu", nodeID, cpu.CPU, "system"}, float32(cpu.System))
|
|
}
|
|
}
|
|
}
|
|
|
|
// setGaugeForDiskStats proxies metrics for disk specific statistics
|
|
func (c *Client) setGaugeForDiskStats(nodeID string, hStats *stats.HostStats) {
|
|
for _, disk := range hStats.DiskStats {
|
|
if !c.config.DisableTaggedMetrics {
|
|
labels := append(c.baseLabels, metrics.Label{
|
|
Name: "disk",
|
|
Value: disk.Device,
|
|
})
|
|
|
|
metrics.SetGaugeWithLabels([]string{"client", "host", "disk", "size"}, float32(disk.Size), labels)
|
|
metrics.SetGaugeWithLabels([]string{"client", "host", "disk", "used"}, float32(disk.Used), labels)
|
|
metrics.SetGaugeWithLabels([]string{"client", "host", "disk", "available"}, float32(disk.Available), labels)
|
|
metrics.SetGaugeWithLabels([]string{"client", "host", "disk", "used_percent"}, float32(disk.UsedPercent), labels)
|
|
metrics.SetGaugeWithLabels([]string{"client", "host", "disk", "inodes_percent"}, float32(disk.InodesUsedPercent), labels)
|
|
}
|
|
|
|
if c.config.BackwardsCompatibleMetrics {
|
|
metrics.SetGauge([]string{"client", "host", "disk", nodeID, disk.Device, "size"}, float32(disk.Size))
|
|
metrics.SetGauge([]string{"client", "host", "disk", nodeID, disk.Device, "used"}, float32(disk.Used))
|
|
metrics.SetGauge([]string{"client", "host", "disk", nodeID, disk.Device, "available"}, float32(disk.Available))
|
|
metrics.SetGauge([]string{"client", "host", "disk", nodeID, disk.Device, "used_percent"}, float32(disk.UsedPercent))
|
|
metrics.SetGauge([]string{"client", "host", "disk", nodeID, disk.Device, "inodes_percent"}, float32(disk.InodesUsedPercent))
|
|
}
|
|
}
|
|
}
|
|
|
|
// setGaugeForAllocationStats proxies metrics for allocation specific statistics
|
|
func (c *Client) setGaugeForAllocationStats(nodeID string) {
|
|
c.configLock.RLock()
|
|
node := c.configCopy.Node
|
|
c.configLock.RUnlock()
|
|
total := node.Resources
|
|
res := node.Reserved
|
|
allocated := c.getAllocatedResources(node)
|
|
|
|
// Emit allocated
|
|
if !c.config.DisableTaggedMetrics {
|
|
metrics.SetGaugeWithLabels([]string{"client", "allocated", "memory"}, float32(allocated.MemoryMB), c.baseLabels)
|
|
metrics.SetGaugeWithLabels([]string{"client", "allocated", "disk"}, float32(allocated.DiskMB), c.baseLabels)
|
|
metrics.SetGaugeWithLabels([]string{"client", "allocated", "cpu"}, float32(allocated.CPU), c.baseLabels)
|
|
metrics.SetGaugeWithLabels([]string{"client", "allocated", "iops"}, float32(allocated.IOPS), c.baseLabels)
|
|
}
|
|
|
|
if c.config.BackwardsCompatibleMetrics {
|
|
metrics.SetGauge([]string{"client", "allocated", "memory", nodeID}, float32(allocated.MemoryMB))
|
|
metrics.SetGauge([]string{"client", "allocated", "disk", nodeID}, float32(allocated.DiskMB))
|
|
metrics.SetGauge([]string{"client", "allocated", "cpu", nodeID}, float32(allocated.CPU))
|
|
metrics.SetGauge([]string{"client", "allocated", "iops", nodeID}, float32(allocated.IOPS))
|
|
}
|
|
|
|
for _, n := range allocated.Networks {
|
|
if !c.config.DisableTaggedMetrics {
|
|
labels := append(c.baseLabels, metrics.Label{
|
|
Name: "device",
|
|
Value: n.Device,
|
|
})
|
|
metrics.SetGaugeWithLabels([]string{"client", "allocated", "network"}, float32(n.MBits), labels)
|
|
}
|
|
|
|
if c.config.BackwardsCompatibleMetrics {
|
|
metrics.SetGauge([]string{"client", "allocated", "network", n.Device, nodeID}, float32(n.MBits))
|
|
}
|
|
}
|
|
|
|
// Emit unallocated
|
|
unallocatedMem := total.MemoryMB - res.MemoryMB - allocated.MemoryMB
|
|
unallocatedDisk := total.DiskMB - res.DiskMB - allocated.DiskMB
|
|
unallocatedCpu := total.CPU - res.CPU - allocated.CPU
|
|
unallocatedIops := total.IOPS - res.IOPS - allocated.IOPS
|
|
|
|
if !c.config.DisableTaggedMetrics {
|
|
metrics.SetGaugeWithLabels([]string{"client", "unallocated", "memory"}, float32(unallocatedMem), c.baseLabels)
|
|
metrics.SetGaugeWithLabels([]string{"client", "unallocated", "disk"}, float32(unallocatedDisk), c.baseLabels)
|
|
metrics.SetGaugeWithLabels([]string{"client", "unallocated", "cpu"}, float32(unallocatedCpu), c.baseLabels)
|
|
metrics.SetGaugeWithLabels([]string{"client", "unallocated", "iops"}, float32(unallocatedIops), c.baseLabels)
|
|
}
|
|
|
|
if c.config.BackwardsCompatibleMetrics {
|
|
metrics.SetGauge([]string{"client", "unallocated", "memory", nodeID}, float32(unallocatedMem))
|
|
metrics.SetGauge([]string{"client", "unallocated", "disk", nodeID}, float32(unallocatedDisk))
|
|
metrics.SetGauge([]string{"client", "unallocated", "cpu", nodeID}, float32(unallocatedCpu))
|
|
metrics.SetGauge([]string{"client", "unallocated", "iops", nodeID}, float32(unallocatedIops))
|
|
}
|
|
|
|
for _, n := range allocated.Networks {
|
|
totalIdx := total.NetIndex(n)
|
|
if totalIdx != -1 {
|
|
continue
|
|
}
|
|
|
|
totalMbits := total.Networks[totalIdx].MBits
|
|
unallocatedMbits := totalMbits - n.MBits
|
|
|
|
if !c.config.DisableTaggedMetrics {
|
|
labels := append(c.baseLabels, metrics.Label{
|
|
Name: "device",
|
|
Value: n.Device,
|
|
})
|
|
metrics.SetGaugeWithLabels([]string{"client", "unallocated", "network"}, float32(unallocatedMbits), labels)
|
|
}
|
|
|
|
if c.config.BackwardsCompatibleMetrics {
|
|
metrics.SetGauge([]string{"client", "unallocated", "network", n.Device, nodeID}, float32(unallocatedMbits))
|
|
}
|
|
}
|
|
}
|
|
|
|
// No labels are required so we emit with only a key/value syntax
|
|
func (c *Client) setGaugeForUptime(hStats *stats.HostStats) {
|
|
if !c.config.DisableTaggedMetrics {
|
|
metrics.SetGaugeWithLabels([]string{"client", "uptime"}, float32(hStats.Uptime), c.baseLabels)
|
|
}
|
|
if c.config.BackwardsCompatibleMetrics {
|
|
metrics.SetGauge([]string{"client", "uptime"}, float32(hStats.Uptime))
|
|
}
|
|
}
|
|
|
|
// emitHostStats pushes host resource usage stats to remote metrics collection sinks
|
|
func (c *Client) emitHostStats() {
|
|
nodeID := c.NodeID()
|
|
hStats := c.hostStatsCollector.Stats()
|
|
|
|
c.setGaugeForMemoryStats(nodeID, hStats)
|
|
c.setGaugeForUptime(hStats)
|
|
c.setGaugeForCPUStats(nodeID, hStats)
|
|
c.setGaugeForDiskStats(nodeID, hStats)
|
|
}
|
|
|
|
// emitClientMetrics emits lower volume client metrics
|
|
func (c *Client) emitClientMetrics() {
|
|
nodeID := c.NodeID()
|
|
|
|
c.setGaugeForAllocationStats(nodeID)
|
|
|
|
// Emit allocation metrics
|
|
blocked, migrating, pending, running, terminal := 0, 0, 0, 0, 0
|
|
for _, ar := range c.getAllocRunners() {
|
|
switch ar.Alloc().ClientStatus {
|
|
case structs.AllocClientStatusPending:
|
|
switch {
|
|
case ar.IsWaiting():
|
|
blocked++
|
|
case ar.IsMigrating():
|
|
migrating++
|
|
default:
|
|
pending++
|
|
}
|
|
case structs.AllocClientStatusRunning:
|
|
running++
|
|
case structs.AllocClientStatusComplete, structs.AllocClientStatusFailed:
|
|
terminal++
|
|
}
|
|
}
|
|
|
|
if !c.config.DisableTaggedMetrics {
|
|
metrics.SetGaugeWithLabels([]string{"client", "allocations", "migrating"}, float32(migrating), c.baseLabels)
|
|
metrics.SetGaugeWithLabels([]string{"client", "allocations", "blocked"}, float32(blocked), c.baseLabels)
|
|
metrics.SetGaugeWithLabels([]string{"client", "allocations", "pending"}, float32(pending), c.baseLabels)
|
|
metrics.SetGaugeWithLabels([]string{"client", "allocations", "running"}, float32(running), c.baseLabels)
|
|
metrics.SetGaugeWithLabels([]string{"client", "allocations", "terminal"}, float32(terminal), c.baseLabels)
|
|
}
|
|
|
|
if c.config.BackwardsCompatibleMetrics {
|
|
metrics.SetGauge([]string{"client", "allocations", "migrating", nodeID}, float32(migrating))
|
|
metrics.SetGauge([]string{"client", "allocations", "blocked", nodeID}, float32(blocked))
|
|
metrics.SetGauge([]string{"client", "allocations", "pending", nodeID}, float32(pending))
|
|
metrics.SetGauge([]string{"client", "allocations", "running", nodeID}, float32(running))
|
|
metrics.SetGauge([]string{"client", "allocations", "terminal", nodeID}, float32(terminal))
|
|
}
|
|
}
|
|
|
|
func (c *Client) getAllocatedResources(selfNode *structs.Node) *structs.Resources {
|
|
// Unfortunately the allocs only have IP so we need to match them to the
|
|
// device
|
|
cidrToDevice := make(map[*net.IPNet]string, len(selfNode.Resources.Networks))
|
|
for _, n := range selfNode.Resources.Networks {
|
|
_, ipnet, err := net.ParseCIDR(n.CIDR)
|
|
if err != nil {
|
|
continue
|
|
}
|
|
cidrToDevice[ipnet] = n.Device
|
|
}
|
|
|
|
// Sum the allocated resources
|
|
allocs := c.allAllocs()
|
|
var allocated structs.Resources
|
|
allocatedDeviceMbits := make(map[string]int)
|
|
for _, alloc := range allocs {
|
|
if !alloc.TerminalStatus() {
|
|
allocated.Add(alloc.Resources)
|
|
for _, allocatedNetwork := range alloc.Resources.Networks {
|
|
for cidr, dev := range cidrToDevice {
|
|
ip := net.ParseIP(allocatedNetwork.IP)
|
|
if cidr.Contains(ip) {
|
|
allocatedDeviceMbits[dev] += allocatedNetwork.MBits
|
|
break
|
|
}
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
// Clear the networks
|
|
allocated.Networks = nil
|
|
for dev, speed := range allocatedDeviceMbits {
|
|
net := &structs.NetworkResource{
|
|
Device: dev,
|
|
MBits: speed,
|
|
}
|
|
allocated.Networks = append(allocated.Networks, net)
|
|
}
|
|
|
|
return &allocated
|
|
}
|
|
|
|
// allAllocs returns all the allocations managed by the client
|
|
func (c *Client) allAllocs() map[string]*structs.Allocation {
|
|
ars := c.getAllocRunners()
|
|
allocs := make(map[string]*structs.Allocation, len(ars))
|
|
for _, ar := range c.getAllocRunners() {
|
|
a := ar.Alloc()
|
|
allocs[a.ID] = a
|
|
}
|
|
return allocs
|
|
}
|