// Copyright (c) HashiCorp, Inc. // SPDX-License-Identifier: BUSL-1.1 package agent import ( "context" "crypto/tls" "encoding/json" "errors" "fmt" proxytracker "github.com/hashicorp/consul/agent/proxy-tracker" catalogproxycfg "github.com/hashicorp/consul/agent/proxycfg-sources/catalog" "github.com/hashicorp/consul/lib/stringslice" "io" "net" "net/http" "os" "path/filepath" "reflect" "regexp" "strconv" "strings" "sync" "sync/atomic" "time" "github.com/armon/go-metrics" "github.com/armon/go-metrics/prometheus" "github.com/hashicorp/go-connlimit" "github.com/hashicorp/go-hclog" "github.com/hashicorp/go-memdb" "github.com/hashicorp/go-multierror" "github.com/hashicorp/hcp-scada-provider/capability" "github.com/hashicorp/raft" "github.com/hashicorp/serf/serf" "golang.org/x/net/http2" "golang.org/x/net/http2/h2c" "google.golang.org/grpc" "github.com/hashicorp/consul/acl" "github.com/hashicorp/consul/acl/resolver" "github.com/hashicorp/consul/agent/ae" "github.com/hashicorp/consul/agent/cache" cachetype "github.com/hashicorp/consul/agent/cache-types" "github.com/hashicorp/consul/agent/checks" "github.com/hashicorp/consul/agent/config" "github.com/hashicorp/consul/agent/consul" rpcRate "github.com/hashicorp/consul/agent/consul/rate" "github.com/hashicorp/consul/agent/consul/servercert" "github.com/hashicorp/consul/agent/dns" external "github.com/hashicorp/consul/agent/grpc-external" grpcDNS "github.com/hashicorp/consul/agent/grpc-external/services/dns" middleware "github.com/hashicorp/consul/agent/grpc-middleware" "github.com/hashicorp/consul/agent/hcp/scada" "github.com/hashicorp/consul/agent/leafcert" "github.com/hashicorp/consul/agent/local" "github.com/hashicorp/consul/agent/proxycfg" proxycfgglue "github.com/hashicorp/consul/agent/proxycfg-glue" localproxycfg "github.com/hashicorp/consul/agent/proxycfg-sources/local" "github.com/hashicorp/consul/agent/rpcclient" "github.com/hashicorp/consul/agent/rpcclient/configentry" "github.com/hashicorp/consul/agent/rpcclient/health" "github.com/hashicorp/consul/agent/structs" "github.com/hashicorp/consul/agent/systemd" "github.com/hashicorp/consul/agent/token" "github.com/hashicorp/consul/agent/xds" "github.com/hashicorp/consul/api" "github.com/hashicorp/consul/api/watch" "github.com/hashicorp/consul/ipaddr" "github.com/hashicorp/consul/lib" "github.com/hashicorp/consul/lib/file" "github.com/hashicorp/consul/lib/mutex" "github.com/hashicorp/consul/lib/routine" "github.com/hashicorp/consul/logging" "github.com/hashicorp/consul/proto-public/pbresource" "github.com/hashicorp/consul/proto/private/pboperator" "github.com/hashicorp/consul/proto/private/pbpeering" "github.com/hashicorp/consul/tlsutil" "github.com/hashicorp/consul/types" ) const ( // Path to save agent service definitions servicesDir = "services" serviceConfigDir = "services/configs" // Path to save agent proxy definitions proxyDir = "proxies" // Path to save local agent checks checksDir = "checks" checkStateDir = "checks/state" // Default reasons for node/service maintenance mode defaultNodeMaintReason = "Maintenance mode is enabled for this node, " + "but no reason was provided. This is a default message." defaultServiceMaintReason = "Maintenance mode is enabled for this " + "service, but no reason was provided. This is a default message." // ID of the roots watch rootsWatchID = "roots" // ID of the leaf watch leafWatchID = "leaf" // maxQueryTime is used to bound the limit of a blocking query maxQueryTime = 600 * time.Second // defaultQueryTime is the amount of time we block waiting for a change // if no time is specified. Previously we would wait the maxQueryTime. defaultQueryTime = 300 * time.Second ) var ( httpAddrRE = regexp.MustCompile(`^(http[s]?://)(\[.*?\]|\[?[\w\-\.]+)(:\d+)?([^?]*)(\?.*)?$`) grpcAddrRE = regexp.MustCompile("(.*)((?::)(?:[0-9]+))(.*)$") ) type configSource int const ( ConfigSourceLocal configSource = iota ConfigSourceRemote ) var configSourceToName = map[configSource]string{ ConfigSourceLocal: "local", ConfigSourceRemote: "remote", } var configSourceFromName = map[string]configSource{ "local": ConfigSourceLocal, "remote": ConfigSourceRemote, // If the value is not found in the persisted config file, then use the // former default. "": ConfigSourceLocal, } func (s configSource) String() string { return configSourceToName[s] } // ConfigSourceFromName will unmarshal the string form of a configSource. func ConfigSourceFromName(name string) (configSource, bool) { s, ok := configSourceFromName[name] return s, ok } // delegate defines the interface shared by both // consul.Client and consul.Server. type delegate interface { // Leave is used to prepare for a graceful shutdown. Leave() error // AgentLocalMember is used to retrieve the LAN member for the local node. AgentLocalMember() serf.Member // LANMembersInAgentPartition returns the LAN members for this agent's // canonical serf pool. For clients this is the only pool that exists. For // servers it's the pool in the default segment and the default partition. LANMembersInAgentPartition() []serf.Member // LANMembers returns the LAN members for one of: // // - the requested partition // - the requested segment // - all segments // // This is limited to segments and partitions that the node is a member of. LANMembers(f consul.LANMemberFilter) ([]serf.Member, error) // GetLANCoordinate returns the coordinate of the node in the LAN gossip // pool. // // - Clients return a single coordinate for the single gossip pool they are // in (default, segment, or partition). // // - Servers return one coordinate for their canonical gossip pool (i.e. // default partition/segment) and one per segment they are also ancillary // members of. // // NOTE: servers do not emit coordinates for partitioned gossip pools they // are ancillary members of. // // NOTE: This assumes coordinates are enabled, so check that before calling. GetLANCoordinate() (lib.CoordinateSet, error) // JoinLAN is used to have Consul join the inner-DC pool The target address // should be another node inside the DC listening on the Serf LAN address JoinLAN(addrs []string, entMeta *acl.EnterpriseMeta) (n int, err error) // RemoveFailedNode is used to remove a failed node from the cluster. RemoveFailedNode(node string, prune bool, entMeta *acl.EnterpriseMeta) error // ResolveTokenAndDefaultMeta returns an acl.Authorizer which authorizes // actions based on the permissions granted to the token. // If either entMeta or authzContext are non-nil they will be populated with the // default partition and namespace from the token. ResolveTokenAndDefaultMeta(token string, entMeta *acl.EnterpriseMeta, authzContext *acl.AuthorizerContext) (resolver.Result, error) RPC(ctx context.Context, method string, args interface{}, reply interface{}) error // ResourceServiceClient is a client for the gRPC Resource Service. ResourceServiceClient() pbresource.ResourceServiceClient SnapshotRPC(args *structs.SnapshotRequest, in io.Reader, out io.Writer, replyFn structs.SnapshotReplyFn) error Shutdown() error Stats() map[string]map[string]string ReloadConfig(config consul.ReloadableConfig) error enterpriseDelegate } // notifier is called after a successful JoinLAN. type notifier interface { Notify(string) error } // Agent is the long running process that is run on every machine. // It exposes an RPC interface that is used by the CLI to control the // agent. The agent runs the query interfaces like HTTP, DNS, and RPC. // However, it can run in either a client, or server mode. In server // mode, it runs a full Consul server. In client-only mode, it only forwards // requests to other Consul servers. type Agent struct { // TODO: remove fields that are already in BaseDeps baseDeps BaseDeps // config is the agent configuration. config *config.RuntimeConfig // Used for writing our logs logger hclog.InterceptLogger // delegate is either a *consul.Server or *consul.Client // depending on the configuration delegate delegate // externalGRPCServer is the gRPC server exposed on dedicated gRPC ports (as // opposed to the multiplexed "server" port). externalGRPCServer *grpc.Server // state stores a local representation of the node, // services and checks. Used for anti-entropy. State *local.State // sync manages the synchronization of the local // and the remote state. sync *ae.StateSyncer // syncMu and syncCh are used to coordinate agent endpoints that are blocking // on local state during a config reload. syncMu sync.Mutex syncCh chan struct{} // cache is the in-memory cache for data the Agent requests. cache *cache.Cache // leafCertManager issues and caches leaf certs as needed. leafCertManager *leafcert.Manager // checkReapAfter maps the check ID to a timeout after which we should // reap its associated service checkReapAfter map[structs.CheckID]time.Duration // checkMonitors maps the check ID to an associated monitor checkMonitors map[structs.CheckID]*checks.CheckMonitor // checkHTTPs maps the check ID to an associated HTTP check checkHTTPs map[structs.CheckID]*checks.CheckHTTP // checkH2PINGs maps the check ID to an associated HTTP2 PING check checkH2PINGs map[structs.CheckID]*checks.CheckH2PING // checkTCPs maps the check ID to an associated TCP check checkTCPs map[structs.CheckID]*checks.CheckTCP // checkUDPs maps the check ID to an associated UDP check checkUDPs map[structs.CheckID]*checks.CheckUDP // checkGRPCs maps the check ID to an associated GRPC check checkGRPCs map[structs.CheckID]*checks.CheckGRPC // checkTTLs maps the check ID to an associated check TTL checkTTLs map[structs.CheckID]*checks.CheckTTL // checkDockers maps the check ID to an associated Docker Exec based check checkDockers map[structs.CheckID]*checks.CheckDocker // checkAliases maps the check ID to an associated Alias checks checkAliases map[structs.CheckID]*checks.CheckAlias // checkOSServices maps the check ID to an associated OS Service check checkOSServices map[structs.CheckID]*checks.CheckOSService // exposedPorts tracks listener ports for checks exposed through a proxy exposedPorts map[string]int // stateLock protects the agent state stateLock *mutex.Mutex // dockerClient is the client for performing docker health checks. dockerClient *checks.DockerClient // osServiceClient is the client for performing OS service checks. osServiceClient *checks.OSServiceClient // eventCh is used to receive user events eventCh chan serf.UserEvent // eventBuf stores the most recent events in a ring buffer // using eventIndex as the next index to insert into. This // is guarded by eventLock. When an insert happens, the // eventNotify group is notified. eventBuf []*UserEvent eventIndex int eventLock sync.RWMutex eventNotify NotifyGroup shutdown bool shutdownCh chan struct{} shutdownLock sync.Mutex // joinLANNotifier is called after a successful JoinLAN. joinLANNotifier notifier // retryJoinCh transports errors from the retry join // attempts. retryJoinCh chan error // endpoints maps unique RPC endpoint names to common ones // to allow overriding of RPC handlers since the golang // net/rpc server does not allow this. endpoints map[string]string endpointsLock sync.RWMutex // dnsServer provides the DNS API dnsServers []*DNSServer // apiServers listening for connections. If any of these server goroutines // fail, the agent will be shutdown. apiServers *apiServers // httpHandlers provides direct access to (one of) the HTTPHandlers started by // this agent. This is used in tests to test HTTP endpoints without overhead // of TCP connections etc. // // TODO: this is a temporary re-introduction after we removed a list of // HTTPServers in favour of apiServers abstraction. Now that HTTPHandlers is // stateful and has config reloading though it's not OK to just use a // different instance of handlers in tests to the ones that the agent is wired // up to since then config reloads won't actually affect the handlers under // test while plumbing the external handlers in the TestAgent through bypasses // testing that the agent itself is actually reloading the state correctly. // Once we move `apiServers` to be a passed-in dependency for NewAgent, we // should be able to remove this and have the Test Agent create the // HTTPHandlers and pass them in removing the need to pull them back out // again. httpHandlers *HTTPHandlers // wgServers is the wait group for all HTTP and DNS servers // TODO: remove once dnsServers are handled by apiServers wgServers sync.WaitGroup // watchPlans tracks all the currently-running watch plans for the // agent. watchPlans []*watch.Plan // tokens holds ACL tokens initially from the configuration, but can // be updated at runtime, so should always be used instead of going to // the configuration directly. tokens *token.Store // proxyConfig is the manager for proxy service (Kind = connect-proxy) // configuration state. This ensures all state needed by a proxy registration // is maintained in cache and handles pushing updates to that state into XDS // server to be pushed out to Envoy. proxyConfig *proxycfg.Manager // serviceManager is the manager for combining local service registrations with // the centrally configured proxy/service defaults. serviceManager *ServiceManager // tlsConfigurator is the central instance to provide a *tls.Config // based on the current consul configuration. tlsConfigurator *tlsutil.Configurator // certManager manages the lifecycle of the internally-managed server certificate. certManager *servercert.CertManager // httpConnLimiter is used to limit connections to the HTTP server by client // IP. httpConnLimiter connlimit.Limiter // configReloaders are subcomponents that need to be notified on a reload so // they can update their internal state. configReloaders []ConfigReloader // TODO: pass directly to HTTPHandlers and DNSServer once those are passed // into Agent, which will allow us to remove this field. rpcClientHealth *health.Client rpcClientConfigEntry *configentry.Client rpcClientPeering pbpeering.PeeringServiceClient rpcClientOperator pboperator.OperatorServiceClient // routineManager is responsible for managing longer running go routines // run by the Agent routineManager *routine.Manager // configFileWatcher is the watcher responsible to report events when a config file // changed configFileWatcher config.Watcher // xdsServer serves the XDS protocol for configuring Envoy proxies. xdsServer *xds.Server // scadaProvider is set when HashiCorp Cloud Platform integration is configured and exposes the agent's API over // an encrypted session to HCP scadaProvider scada.Provider // enterpriseAgent embeds fields that we only access in consul-enterprise builds enterpriseAgent enableDebug atomic.Bool } // New process the desired options and creates a new Agent. // This process will // - parse the config given the config Flags // - setup logging // - using predefined logger given in an option // OR // - initialize a new logger from the configuration // including setting up gRPC logging // - initialize telemetry // - create a TLS Configurator // - build a shared connection pool // - create the ServiceManager // - setup the NodeID if one isn't provided in the configuration // - create the AutoConfig object for future use in fully // resolving the configuration func New(bd BaseDeps) (*Agent, error) { if bd.LeafCertManager == nil { return nil, errors.New("LeafCertManager is required") } if bd.NetRPC == nil { return nil, errors.New("NetRPC is required") } a := Agent{ checkReapAfter: make(map[structs.CheckID]time.Duration), checkMonitors: make(map[structs.CheckID]*checks.CheckMonitor), checkTTLs: make(map[structs.CheckID]*checks.CheckTTL), checkHTTPs: make(map[structs.CheckID]*checks.CheckHTTP), checkH2PINGs: make(map[structs.CheckID]*checks.CheckH2PING), checkTCPs: make(map[structs.CheckID]*checks.CheckTCP), checkUDPs: make(map[structs.CheckID]*checks.CheckUDP), checkGRPCs: make(map[structs.CheckID]*checks.CheckGRPC), checkDockers: make(map[structs.CheckID]*checks.CheckDocker), checkAliases: make(map[structs.CheckID]*checks.CheckAlias), checkOSServices: make(map[structs.CheckID]*checks.CheckOSService), eventCh: make(chan serf.UserEvent, 1024), eventBuf: make([]*UserEvent, 256), joinLANNotifier: &systemd.Notifier{}, retryJoinCh: make(chan error), shutdownCh: make(chan struct{}), endpoints: make(map[string]string), stateLock: mutex.New(), baseDeps: bd, tokens: bd.Tokens, logger: bd.Logger, tlsConfigurator: bd.TLSConfigurator, config: bd.RuntimeConfig, cache: bd.Cache, leafCertManager: bd.LeafCertManager, routineManager: routine.NewManager(bd.Logger), scadaProvider: bd.HCP.Provider, } // TODO: create rpcClientHealth in BaseDeps once NetRPC is available without Agent conn, err := bd.GRPCConnPool.ClientConn(bd.RuntimeConfig.Datacenter) if err != nil { return nil, err } a.rpcClientHealth = &health.Client{ Client: rpcclient.Client{ Cache: bd.Cache, NetRPC: &a, CacheName: cachetype.HealthServicesName, ViewStore: bd.ViewStore, MaterializerDeps: rpcclient.MaterializerDeps{ Conn: conn, Logger: bd.Logger.Named("rpcclient.health"), }, UseStreamingBackend: a.config.UseStreamingBackend, QueryOptionDefaults: config.ApplyDefaultQueryOptions(a.config), }, } a.rpcClientPeering = pbpeering.NewPeeringServiceClient(conn) a.rpcClientOperator = pboperator.NewOperatorServiceClient(conn) a.serviceManager = NewServiceManager(&a) a.rpcClientConfigEntry = &configentry.Client{ Client: rpcclient.Client{ Cache: bd.Cache, NetRPC: &a, CacheName: cachetype.ConfigEntryName, ViewStore: bd.ViewStore, MaterializerDeps: rpcclient.MaterializerDeps{ Conn: conn, Logger: bd.Logger.Named("rpcclient.configentry"), }, QueryOptionDefaults: config.ApplyDefaultQueryOptions(a.config), }, } // TODO(rb): remove this once NetRPC is properly available in BaseDeps without an Agent bd.NetRPC.SetNetRPC(&a) // We used to do this in the Start method. However it doesn't need to go // there any longer. Originally it did because we passed the agent // delegate to some of the cache registrations. Now we just // pass the agent itself so its safe to move here. a.registerCache() // TODO: why do we ignore failure to load persisted tokens? _ = a.tokens.Load(bd.RuntimeConfig.ACLTokens, a.logger) // TODO: pass in a fully populated apiServers into Agent.New a.apiServers = NewAPIServers(a.logger) for _, f := range []struct { Cfg tlsutil.ProtocolConfig }{ {a.baseDeps.RuntimeConfig.TLS.InternalRPC}, {a.baseDeps.RuntimeConfig.TLS.GRPC}, {a.baseDeps.RuntimeConfig.TLS.HTTPS}, } { if f.Cfg.KeyFile != "" { a.baseDeps.WatchedFiles = append(a.baseDeps.WatchedFiles, f.Cfg.KeyFile) } if f.Cfg.CertFile != "" { a.baseDeps.WatchedFiles = append(a.baseDeps.WatchedFiles, f.Cfg.CertFile) } } if a.baseDeps.RuntimeConfig.AutoReloadConfig && len(a.baseDeps.WatchedFiles) > 0 { w, err := config.NewRateLimitedFileWatcher(a.baseDeps.WatchedFiles, a.baseDeps.Logger, a.baseDeps.RuntimeConfig.AutoReloadConfigCoalesceInterval) if err != nil { return nil, err } a.configFileWatcher = w } return &a, nil } // GetConfig retrieves the agents config // TODO make export the config field and get rid of this method // This is here for now to simplify the work I am doing and make // reviewing the final PR easier. func (a *Agent) GetConfig() *config.RuntimeConfig { a.stateLock.Lock() defer a.stateLock.Unlock() return a.config } // LocalConfig takes a config.RuntimeConfig and maps the fields to a local.Config func LocalConfig(cfg *config.RuntimeConfig) local.Config { lc := local.Config{ AdvertiseAddr: cfg.AdvertiseAddrLAN.String(), CheckUpdateInterval: cfg.CheckUpdateInterval, Datacenter: cfg.Datacenter, DiscardCheckOutput: cfg.DiscardCheckOutput, NodeID: cfg.NodeID, NodeName: cfg.NodeName, NodeLocality: cfg.StructLocality(), Partition: cfg.PartitionOrDefault(), TaggedAddresses: map[string]string{}, } for k, v := range cfg.TaggedAddresses { lc.TaggedAddresses[k] = v } return lc } // Start verifies its configuration and runs an agent's various subprocesses. func (a *Agent) Start(ctx context.Context) error { a.stateLock.Lock() defer a.stateLock.Unlock() // This needs to be done early on as it will potentially alter the configuration // and then how other bits are brought up c, err := a.baseDeps.AutoConfig.InitialConfiguration(ctx) if err != nil { return err } // Copy over the existing node id. This cannot be // changed while running, but this prevents // breaking some existing behavior. c.NodeID = a.config.NodeID // Overwrite the configuration. a.config = c a.enableDebug.Store(c.EnableDebug) if err := a.tlsConfigurator.Update(a.config.TLS); err != nil { return fmt.Errorf("Failed to load TLS configurations after applying auto-config settings: %w", err) } if err := a.startLicenseManager(ctx); err != nil { return err } // create the local state a.State = local.NewState(LocalConfig(c), a.logger, a.tokens) // create the state synchronization manager which performs // regular and on-demand state synchronizations (anti-entropy). a.sync = ae.NewStateSyncer(a.State, c.AEInterval, a.shutdownCh, a.logger) err = validateFIPSConfig(a.config) if err != nil { // Log warning, rather than force breaking a.logger.Warn("FIPS 140-2 Compliance", "issue", err) } // create the config for the rpc server/client consulCfg, err := newConsulConfig(a.config, a.logger) if err != nil { return err } // Setup the user event callback consulCfg.UserEventHandler = func(e serf.UserEvent) { select { case a.eventCh <- e: case <-a.shutdownCh: } } // ServerUp is used to inform that a new consul server is now // up. This can be used to speed up the sync process if we are blocking // waiting to discover a consul server consulCfg.ServerUp = a.sync.SyncFull.Trigger err = a.initEnterprise(consulCfg) if err != nil { return fmt.Errorf("failed to start Consul enterprise component: %v", err) } // Setup either the client or the server. if c.ServerMode { serverLogger := a.baseDeps.Logger.NamedIntercept(logging.ConsulServer) // Check for a last seen timestamp and exit if deemed stale before attempting to join // Serf/Raft or listen for requests. if err := a.checkServerLastSeen(consul.ReadServerMetadata); err != nil { deadline := time.Now().Add(time.Minute) for time.Now().Before(deadline) { a.logger.Error("startup error", "error", err) time.Sleep(10 * time.Second) } return err } // Periodically write server metadata to disk. if !consulCfg.DevMode { go a.persistServerMetadata() } incomingRPCLimiter := consul.ConfiguredIncomingRPCLimiter( &lib.StopChannelContext{StopCh: a.shutdownCh}, serverLogger, consulCfg, ) a.externalGRPCServer = external.NewServer( a.logger.Named("grpc.external"), metrics.Default(), a.tlsConfigurator, incomingRPCLimiter, ) server, err := consul.NewServer(consulCfg, a.baseDeps.Deps, a.externalGRPCServer, incomingRPCLimiter, serverLogger) if err != nil { return fmt.Errorf("Failed to start Consul server: %v", err) } incomingRPCLimiter.Register(server) a.delegate = server if a.config.PeeringEnabled && a.config.ConnectEnabled { d := servercert.Deps{ Logger: a.logger.Named("server.cert-manager"), Config: servercert.Config{ Datacenter: a.config.Datacenter, ACLsEnabled: a.config.ACLsEnabled, }, LeafCertManager: a.leafCertManager, GetStore: func() servercert.Store { return server.FSM().State() }, TLSConfigurator: a.tlsConfigurator, } a.certManager = servercert.NewCertManager(d) if err := a.certManager.Start(&lib.StopChannelContext{StopCh: a.shutdownCh}); err != nil { return fmt.Errorf("failed to start server cert manager: %w", err) } } } else { a.externalGRPCServer = external.NewServer( a.logger.Named("grpc.external"), metrics.Default(), a.tlsConfigurator, rpcRate.NullRequestLimitsHandler(), ) client, err := consul.NewClient(consulCfg, a.baseDeps.Deps) if err != nil { return fmt.Errorf("Failed to start Consul client: %v", err) } a.delegate = client } // The staggering of the state syncing depends on the cluster size. // // NOTE: we will use the agent's canonical serf pool for this since that's // similarly scoped with the state store side of anti-entropy. a.sync.ClusterSize = func() int { return len(a.delegate.LANMembersInAgentPartition()) } // link the state with the consul server/client and the state syncer // via callbacks. After several attempts this was easier than using // channels since the event notification needs to be non-blocking // and that should be hidden in the state syncer implementation. a.State.Delegate = a.delegate a.State.TriggerSyncChanges = a.sync.SyncChanges.Trigger if err := a.baseDeps.AutoConfig.Start(&lib.StopChannelContext{StopCh: a.shutdownCh}); err != nil { return fmt.Errorf("AutoConf failed to start certificate monitor: %w", err) } // Load checks/services/metadata. emptyCheckSnapshot := map[structs.CheckID]*structs.HealthCheck{} if err := a.loadServices(c, emptyCheckSnapshot); err != nil { return err } if err := a.loadChecks(c, nil); err != nil { return err } if err := a.loadMetadata(c); err != nil { return err } var intentionDefaultAllow bool switch a.config.ACLResolverSettings.ACLDefaultPolicy { case "allow": intentionDefaultAllow = true case "deny": intentionDefaultAllow = false default: return fmt.Errorf("unexpected ACL default policy value of %q", a.config.ACLResolverSettings.ACLDefaultPolicy) } go a.baseDeps.ViewStore.Run(&lib.StopChannelContext{StopCh: a.shutdownCh}) // Start the proxy config manager. a.proxyConfig, err = proxycfg.NewManager(proxycfg.ManagerConfig{ DataSources: a.proxyDataSources(), Logger: a.logger.Named(logging.ProxyConfig), Source: &structs.QuerySource{ Datacenter: a.config.Datacenter, Segment: a.config.SegmentName, Node: a.config.NodeName, NodePartition: a.config.PartitionOrEmpty(), }, DNSConfig: proxycfg.DNSConfig{ Domain: a.config.DNSDomain, AltDomain: a.config.DNSAltDomain, }, TLSConfigurator: a.tlsConfigurator, IntentionDefaultAllow: intentionDefaultAllow, UpdateRateLimit: a.config.XDSUpdateRateLimit, }) if err != nil { return err } go localproxycfg.Sync( &lib.StopChannelContext{StopCh: a.shutdownCh}, localproxycfg.SyncConfig{ Manager: a.proxyConfig, State: a.State, Logger: a.proxyConfig.Logger.Named("agent-state"), Tokens: a.baseDeps.Tokens, NodeName: a.config.NodeName, ResyncFrequency: a.config.LocalProxyConfigResyncInterval, }, ) // Start watching for critical services to deregister, based on their // checks. go a.reapServices() // Start handling events. go a.handleEvents() // Start sending network coordinate to the server. if !c.DisableCoordinates { go a.sendCoordinate() } // Write out the PID file if necessary. if err := a.storePid(); err != nil { return err } // start DNS servers if err := a.listenAndServeDNS(); err != nil { return err } // Configure the http connection limiter. a.httpConnLimiter.SetConfig(connlimit.Config{ MaxConnsPerClientIP: a.config.HTTPMaxConnsPerClient, }) // Create listeners and unstarted servers; see comment on listenHTTP why // we are doing this. servers, err := a.listenHTTP() if err != nil { return err } // Start HTTP and HTTPS servers. for _, srv := range servers { a.apiServers.Start(srv) } // Start grpc and grpc_tls servers. if err := a.listenAndServeGRPC(); err != nil { return err } // Start a goroutine to terminate excess xDS sessions. go a.baseDeps.XDSStreamLimiter.Run(&lib.StopChannelContext{StopCh: a.shutdownCh}) // register watches if err := a.reloadWatches(a.config); err != nil { return err } // start retry join go a.retryJoinLAN() if a.config.ServerMode { go a.retryJoinWAN() } if a.tlsConfigurator.Cert() != nil { m := tlsCertExpirationMonitor(a.tlsConfigurator, a.logger) go m.Monitor(&lib.StopChannelContext{StopCh: a.shutdownCh}) } // consul version metric with labels metrics.SetGaugeWithLabels([]string{"version"}, 1, []metrics.Label{ {Name: "version", Value: a.config.VersionWithMetadata()}, {Name: "pre_release", Value: a.config.VersionPrerelease}, }) // start a go routine to reload config based on file watcher events if a.configFileWatcher != nil { a.baseDeps.Logger.Debug("starting file watcher") a.configFileWatcher.Start(context.Background()) go func() { for event := range a.configFileWatcher.EventsCh() { a.baseDeps.Logger.Debug("auto-reload config triggered", "num-events", len(event.Filenames)) err := a.AutoReloadConfig() if err != nil { a.baseDeps.Logger.Error("error loading config", "error", err) } } }() } if a.scadaProvider != nil { a.scadaProvider.UpdateMeta(map[string]string{ "consul_server_id": string(a.config.NodeID), }) if err = a.scadaProvider.Start(); err != nil { a.baseDeps.Logger.Error("scada provider failed to start, some HashiCorp Cloud Platform functionality has been disabled", "error", err, "resource_id", a.config.Cloud.ResourceID) } } return nil } var Gauges = []prometheus.GaugeDefinition{ { Name: []string{"version"}, Help: "Represents the Consul version.", }, } // Failed returns a channel which is closed when the first server goroutine exits // with a non-nil error. func (a *Agent) Failed() <-chan struct{} { return a.apiServers.failed } // useV2Resources returns true if "resource-apis" is present in the Experiments // array of the agent config. func (a *Agent) useV2Resources() bool { if stringslice.Contains(a.baseDeps.Experiments, consul.CatalogResourceExperimentName) { return true } return false } // getProxyWatcher returns the proper implementation of the ProxyWatcher interface. // It will return a ProxyTracker if "resource-apis" experiment is active. Otherwise, // it will return a ConfigSource. func (a *Agent) getProxyWatcher() xds.ProxyWatcher { if a.useV2Resources() { return proxytracker.NewProxyTracker(proxytracker.ProxyTrackerConfig{ Logger: a.proxyConfig.Logger.Named("proxy-tracker"), SessionLimiter: a.baseDeps.XDSStreamLimiter, }) } else { return localproxycfg.NewConfigSource(a.proxyConfig) } } // configureXDSServer configures an XDS server with the proper implementation of // the PRoxyWatcher interface and registers the XDS server with Consul's // external facing GRPC server. func (a *Agent) configureXDSServer() { cfg := a.getProxyWatcher() // TODO(agentless): rather than asserting the concrete type of delegate, we // should add a method to the Delegate interface to build a ConfigSource. if server, ok := a.delegate.(*consul.Server); ok { catalogCfg := catalogproxycfg.NewConfigSource(catalogproxycfg.Config{ NodeName: a.config.NodeName, LocalState: a.State, LocalConfigSource: cfg, Manager: a.proxyConfig, GetStore: func() catalogproxycfg.Store { return server.FSM().State() }, Logger: a.proxyConfig.Logger.Named("server-catalog"), SessionLimiter: a.baseDeps.XDSStreamLimiter, }) go func() { <-a.shutdownCh catalogCfg.Shutdown() }() cfg = catalogCfg } a.xdsServer = xds.NewServer( a.config.NodeName, a.logger.Named(logging.Envoy), cfg, func(id string) (acl.Authorizer, error) { return a.delegate.ResolveTokenAndDefaultMeta(id, nil, nil) }, a, ) a.xdsServer.Register(a.externalGRPCServer) } func (a *Agent) listenAndServeGRPC() error { if len(a.config.GRPCAddrs) < 1 && len(a.config.GRPCTLSAddrs) < 1 { return nil } a.configureXDSServer() // Attempt to spawn listeners var listeners []net.Listener start := func(port_name string, addrs []net.Addr, protocol middleware.Protocol) error { if len(addrs) < 1 { return nil } ln, err := a.startListeners(addrs) if err != nil { return err } for i := range ln { ln[i] = middleware.LabelledListener{Listener: ln[i], Protocol: protocol} listeners = append(listeners, ln[i]) } for _, l := range ln { go func(innerL net.Listener) { a.logger.Info("Started gRPC listeners", "port_name", port_name, "address", innerL.Addr().String(), "network", innerL.Addr().Network(), ) err := a.externalGRPCServer.Serve(innerL) if err != nil { a.logger.Error("gRPC server failed", "port_name", port_name, "error", err) } }(l) } return nil } // Only allow grpc to spawn with a plain-text listener. if a.config.GRPCPort > 0 { if err := start("grpc", a.config.GRPCAddrs, middleware.ProtocolPlaintext); err != nil { closeListeners(listeners) return err } } // Only allow grpc_tls to spawn with a TLS listener. if a.config.GRPCTLSPort > 0 { if err := start("grpc_tls", a.config.GRPCTLSAddrs, middleware.ProtocolTLS); err != nil { closeListeners(listeners) return err } } return nil } func (a *Agent) listenAndServeDNS() error { notif := make(chan net.Addr, len(a.config.DNSAddrs)) errCh := make(chan error, len(a.config.DNSAddrs)) for _, addr := range a.config.DNSAddrs { // create server s, err := NewDNSServer(a) if err != nil { return err } a.dnsServers = append(a.dnsServers, s) // start server a.wgServers.Add(1) go func(addr net.Addr) { defer a.wgServers.Done() err := s.ListenAndServe(addr.Network(), addr.String(), func() { notif <- addr }) if err != nil && !strings.Contains(err.Error(), "accept") { errCh <- err } }(addr) } s, _ := NewDNSServer(a) grpcDNS.NewServer(grpcDNS.Config{ Logger: a.logger.Named("grpc-api.dns"), DNSServeMux: s.mux, LocalAddr: grpcDNS.LocalAddr{IP: net.IPv4(127, 0, 0, 1), Port: a.config.GRPCPort}, }).Register(a.externalGRPCServer) a.dnsServers = append(a.dnsServers, s) // wait for servers to be up timeout := time.After(time.Second) var merr *multierror.Error for range a.config.DNSAddrs { select { case addr := <-notif: a.logger.Info("Started DNS server", "address", addr.String(), "network", addr.Network(), ) case err := <-errCh: merr = multierror.Append(merr, err) case <-timeout: merr = multierror.Append(merr, fmt.Errorf("agent: timeout starting DNS servers")) return merr.ErrorOrNil() } } return merr.ErrorOrNil() } // startListeners will return a net.Listener for every address unless an // error is encountered, in which case it will close all previously opened // listeners and return the error. func (a *Agent) startListeners(addrs []net.Addr) ([]net.Listener, error) { var lns []net.Listener closeAll := func() { for _, l := range lns { l.Close() } } for _, addr := range addrs { var l net.Listener var err error switch x := addr.(type) { case *net.UnixAddr: l, err = a.listenSocket(x.Name) if err != nil { closeAll() return nil, err } case *net.TCPAddr: l, err = net.Listen("tcp", x.String()) if err != nil { closeAll() return nil, err } l = &tcpKeepAliveListener{l.(*net.TCPListener)} case *capability.Addr: l, err = a.scadaProvider.Listen(x.Capability()) if err != nil { return nil, err } default: closeAll() return nil, fmt.Errorf("unsupported address type %T", addr) } lns = append(lns, l) } return lns, nil } // listenHTTP binds listeners to the provided addresses and also returns // pre-configured HTTP servers which are not yet started. The motivation is // that in the current startup/shutdown setup we de-couple the listener // creation from the server startup assuming that if any of the listeners // cannot be bound we fail immediately and later failures do not occur. // Therefore, starting a server with a running listener is assumed to not // produce an error. // // The second motivation is that an HTTPS server needs to use the same TLSConfig // on both the listener and the HTTP server. When listeners and servers are // created at different times this becomes difficult to handle without keeping // the TLS configuration somewhere or recreating it. // // This approach should ultimately be refactored to the point where we just // start the server and any error should trigger a proper shutdown of the agent. func (a *Agent) listenHTTP() ([]apiServer, error) { var ln []net.Listener var servers []apiServer start := func(proto string, addrs []net.Addr) error { listeners, err := a.startListeners(addrs) if err != nil { return err } ln = append(ln, listeners...) for _, l := range listeners { var tlscfg *tls.Config _, isTCP := l.(*tcpKeepAliveListener) isUnix := l.Addr().Network() == "unix" if (isTCP || isUnix) && proto == "https" { tlscfg = a.tlsConfigurator.IncomingHTTPSConfig() l = tls.NewListener(l, tlscfg) } srv := &HTTPHandlers{ agent: a, denylist: NewDenylist(a.config.HTTPBlockEndpoints), proxyTransport: http.DefaultTransport, } a.configReloaders = append(a.configReloaders, srv.ReloadConfig) a.httpHandlers = srv httpServer := &http.Server{ Addr: l.Addr().String(), TLSConfig: tlscfg, Handler: srv.handler(), MaxHeaderBytes: a.config.HTTPMaxHeaderBytes, } if scada.IsCapability(l.Addr()) { // wrap in http2 server handler httpServer.Handler = h2c.NewHandler(srv.handler(), &http2.Server{}) } // Load the connlimit helper into the server connLimitFn := a.httpConnLimiter.HTTPConnStateFuncWithDefault429Handler(10 * time.Millisecond) if proto == "https" { if err := setupHTTPS(httpServer, connLimitFn, a.config.HTTPSHandshakeTimeout); err != nil { return err } } else { httpServer.ConnState = connLimitFn } servers = append(servers, newAPIServerHTTP(proto, l, httpServer)) } return nil } httpAddrs := a.config.HTTPAddrs if a.config.IsCloudEnabled() { httpAddrs = append(httpAddrs, scada.CAPCoreAPI) } if err := start("http", httpAddrs); err != nil { closeListeners(ln) return nil, err } if err := start("https", a.config.HTTPSAddrs); err != nil { closeListeners(ln) return nil, err } return servers, nil } func closeListeners(lns []net.Listener) { for _, l := range lns { l.Close() } } // setupHTTPS adds HTTP/2 support, ConnState, and a connection handshake timeout // to the http.Server. func setupHTTPS(server *http.Server, connState func(net.Conn, http.ConnState), timeout time.Duration) error { // Enforce TLS handshake timeout server.ConnState = func(conn net.Conn, state http.ConnState) { switch state { case http.StateNew: // Set deadline to prevent slow send before TLS handshake or first // byte of request. conn.SetReadDeadline(time.Now().Add(timeout)) case http.StateActive: // Clear read deadline. We should maybe set read timeouts more // generally but that's a bigger task as some HTTP endpoints may // stream large requests and responses (e.g. snapshot) so we can't // set sensible blanket timeouts here. conn.SetReadDeadline(time.Time{}) } // Pass through to conn limit. This is OK because we didn't change // state (i.e. Close conn). connState(conn, state) } // This will enable upgrading connections to HTTP/2 as // part of TLS negotiation. return http2.ConfigureServer(server, nil) } // tcpKeepAliveListener sets TCP keep-alive timeouts on accepted // connections. It's used so dead TCP connections eventually go away. type tcpKeepAliveListener struct { *net.TCPListener } func (ln tcpKeepAliveListener) Accept() (c net.Conn, err error) { tc, err := ln.AcceptTCP() if err != nil { return } tc.SetKeepAlive(true) tc.SetKeepAlivePeriod(30 * time.Second) return tc, nil } func (a *Agent) listenSocket(path string) (net.Listener, error) { if _, err := os.Stat(path); !os.IsNotExist(err) { a.logger.Warn("Replacing socket", "path", path) } if err := os.Remove(path); err != nil && !os.IsNotExist(err) { return nil, fmt.Errorf("error removing socket file: %s", err) } l, err := net.Listen("unix", path) if err != nil { return nil, err } user, group, mode := a.config.UnixSocketUser, a.config.UnixSocketGroup, a.config.UnixSocketMode if err := setFilePermissions(path, user, group, mode); err != nil { return nil, fmt.Errorf("Failed setting up socket: %s", err) } return l, nil } // stopAllWatches stops all the currently running watches func (a *Agent) stopAllWatches() { for _, wp := range a.watchPlans { wp.Stop() } } // reloadWatches stops any existing watch plans and attempts to load the given // set of watches. func (a *Agent) reloadWatches(cfg *config.RuntimeConfig) error { // Stop the current watches. a.stopAllWatches() a.watchPlans = nil // Return if there are no watches now. if len(cfg.Watches) == 0 { return nil } // Watches use the API to talk to this agent, so that must be enabled. if len(cfg.HTTPAddrs) == 0 && len(cfg.HTTPSAddrs) == 0 { return fmt.Errorf("watch plans require an HTTP or HTTPS endpoint") } // Compile the watches var watchPlans []*watch.Plan for _, params := range cfg.Watches { if handlerType, ok := params["handler_type"]; !ok { params["handler_type"] = "script" } else if handlerType != "http" && handlerType != "script" { return fmt.Errorf("Handler type '%s' not recognized", params["handler_type"]) } // Don't let people use connect watches via this mechanism for now as it // needs thought about how to do securely and shouldn't be necessary. Note // that if the type assertion fails an type is not a string then // ParseExample below will error so we don't need to handle that case. if typ, ok := params["type"].(string); ok { if strings.HasPrefix(typ, "connect_") { return fmt.Errorf("Watch type %s is not allowed in agent config", typ) } } wp, err := makeWatchPlan(a.logger, params) if err != nil { return err } watchPlans = append(watchPlans, wp) } // Fire off a goroutine for each new watch plan. for _, wp := range watchPlans { config, err := a.config.APIConfig(true) if err != nil { a.logger.Error("Failed to run watch", "error", err) continue } a.watchPlans = append(a.watchPlans, wp) go func(wp *watch.Plan) { if h, ok := wp.Exempt["handler"]; ok { wp.Handler = makeWatchHandler(a.logger, h) } else if h, ok := wp.Exempt["args"]; ok { wp.Handler = makeWatchHandler(a.logger, h) } else { httpConfig := wp.Exempt["http_handler_config"].(*watch.HttpHandlerConfig) wp.Handler = makeHTTPWatchHandler(a.logger, httpConfig) } wp.Logger = a.logger.Named("watch") addr := config.Address if config.Scheme == "https" { addr = "https://" + addr } if err := wp.RunWithConfig(addr, config); err != nil { a.logger.Error("Failed to run watch", "error", err) } }(wp) } return nil } // newConsulConfig translates a RuntimeConfig into a consul.Config. // TODO: move this function to a different file, maybe config.go func newConsulConfig(runtimeCfg *config.RuntimeConfig, logger hclog.Logger) (*consul.Config, error) { cfg := consul.DefaultConfig() // This is set when the agent starts up cfg.NodeID = runtimeCfg.NodeID // Apply dev mode cfg.DevMode = runtimeCfg.DevMode // Override with our runtimeCfg // todo(fs): these are now always set in the runtime runtimeCfg so we can simplify this // todo(fs): or is there a reason to keep it like that? cfg.Datacenter = runtimeCfg.Datacenter cfg.PrimaryDatacenter = runtimeCfg.PrimaryDatacenter cfg.DataDir = runtimeCfg.DataDir cfg.NodeName = runtimeCfg.NodeName cfg.ACLResolverSettings = runtimeCfg.ACLResolverSettings cfg.CoordinateUpdateBatchSize = runtimeCfg.ConsulCoordinateUpdateBatchSize cfg.CoordinateUpdateMaxBatches = runtimeCfg.ConsulCoordinateUpdateMaxBatches cfg.CoordinateUpdatePeriod = runtimeCfg.ConsulCoordinateUpdatePeriod cfg.CheckOutputMaxSize = runtimeCfg.CheckOutputMaxSize cfg.RaftConfig.HeartbeatTimeout = runtimeCfg.ConsulRaftHeartbeatTimeout cfg.RaftConfig.LeaderLeaseTimeout = runtimeCfg.ConsulRaftLeaderLeaseTimeout cfg.RaftConfig.ElectionTimeout = runtimeCfg.ConsulRaftElectionTimeout cfg.SerfLANConfig.MemberlistConfig.BindAddr = runtimeCfg.SerfBindAddrLAN.IP.String() cfg.SerfLANConfig.MemberlistConfig.BindPort = runtimeCfg.SerfBindAddrLAN.Port cfg.SerfLANConfig.MemberlistConfig.CIDRsAllowed = runtimeCfg.SerfAllowedCIDRsLAN cfg.SerfWANConfig.MemberlistConfig.CIDRsAllowed = runtimeCfg.SerfAllowedCIDRsWAN cfg.SerfLANConfig.MemberlistConfig.AdvertiseAddr = runtimeCfg.SerfAdvertiseAddrLAN.IP.String() cfg.SerfLANConfig.MemberlistConfig.AdvertisePort = runtimeCfg.SerfAdvertiseAddrLAN.Port cfg.SerfLANConfig.MemberlistConfig.GossipVerifyIncoming = runtimeCfg.StaticRuntimeConfig.EncryptVerifyIncoming cfg.SerfLANConfig.MemberlistConfig.GossipVerifyOutgoing = runtimeCfg.StaticRuntimeConfig.EncryptVerifyOutgoing cfg.SerfLANConfig.MemberlistConfig.GossipInterval = runtimeCfg.GossipLANGossipInterval cfg.SerfLANConfig.MemberlistConfig.GossipNodes = runtimeCfg.GossipLANGossipNodes cfg.SerfLANConfig.MemberlistConfig.ProbeInterval = runtimeCfg.GossipLANProbeInterval cfg.SerfLANConfig.MemberlistConfig.ProbeTimeout = runtimeCfg.GossipLANProbeTimeout cfg.SerfLANConfig.MemberlistConfig.SuspicionMult = runtimeCfg.GossipLANSuspicionMult cfg.SerfLANConfig.MemberlistConfig.RetransmitMult = runtimeCfg.GossipLANRetransmitMult if runtimeCfg.ReconnectTimeoutLAN != 0 { cfg.SerfLANConfig.ReconnectTimeout = runtimeCfg.ReconnectTimeoutLAN } if runtimeCfg.SerfBindAddrWAN != nil { cfg.SerfWANConfig.MemberlistConfig.BindAddr = runtimeCfg.SerfBindAddrWAN.IP.String() cfg.SerfWANConfig.MemberlistConfig.BindPort = runtimeCfg.SerfBindAddrWAN.Port cfg.SerfWANConfig.MemberlistConfig.AdvertiseAddr = runtimeCfg.SerfAdvertiseAddrWAN.IP.String() cfg.SerfWANConfig.MemberlistConfig.AdvertisePort = runtimeCfg.SerfAdvertiseAddrWAN.Port cfg.SerfWANConfig.MemberlistConfig.GossipVerifyIncoming = runtimeCfg.StaticRuntimeConfig.EncryptVerifyIncoming cfg.SerfWANConfig.MemberlistConfig.GossipVerifyOutgoing = runtimeCfg.StaticRuntimeConfig.EncryptVerifyOutgoing cfg.SerfWANConfig.MemberlistConfig.GossipInterval = runtimeCfg.GossipWANGossipInterval cfg.SerfWANConfig.MemberlistConfig.GossipNodes = runtimeCfg.GossipWANGossipNodes cfg.SerfWANConfig.MemberlistConfig.ProbeInterval = runtimeCfg.GossipWANProbeInterval cfg.SerfWANConfig.MemberlistConfig.ProbeTimeout = runtimeCfg.GossipWANProbeTimeout cfg.SerfWANConfig.MemberlistConfig.SuspicionMult = runtimeCfg.GossipWANSuspicionMult cfg.SerfWANConfig.MemberlistConfig.RetransmitMult = runtimeCfg.GossipWANRetransmitMult if runtimeCfg.ReconnectTimeoutWAN != 0 { cfg.SerfWANConfig.ReconnectTimeout = runtimeCfg.ReconnectTimeoutWAN } } else { // Disable serf WAN federation cfg.SerfWANConfig = nil } cfg.AdvertiseReconnectTimeout = runtimeCfg.AdvertiseReconnectTimeout cfg.RPCAddr = runtimeCfg.RPCBindAddr cfg.RPCAdvertise = runtimeCfg.RPCAdvertiseAddr cfg.GRPCPort = runtimeCfg.GRPCPort cfg.GRPCTLSPort = runtimeCfg.GRPCTLSPort cfg.Segment = runtimeCfg.SegmentName if len(runtimeCfg.Segments) > 0 { segments, err := segmentConfig(runtimeCfg) if err != nil { return nil, err } cfg.Segments = segments } if runtimeCfg.Bootstrap { cfg.Bootstrap = true } if runtimeCfg.CheckOutputMaxSize > 0 { cfg.CheckOutputMaxSize = runtimeCfg.CheckOutputMaxSize } if runtimeCfg.RejoinAfterLeave { cfg.RejoinAfterLeave = true } if runtimeCfg.BootstrapExpect != 0 { cfg.BootstrapExpect = runtimeCfg.BootstrapExpect } if runtimeCfg.RPCProtocol > 0 { cfg.ProtocolVersion = uint8(runtimeCfg.RPCProtocol) } if runtimeCfg.RaftProtocol != 0 { cfg.RaftConfig.ProtocolVersion = raft.ProtocolVersion(runtimeCfg.RaftProtocol) } if runtimeCfg.RaftSnapshotThreshold != 0 { cfg.RaftConfig.SnapshotThreshold = uint64(runtimeCfg.RaftSnapshotThreshold) } if runtimeCfg.RaftSnapshotInterval != 0 { cfg.RaftConfig.SnapshotInterval = runtimeCfg.RaftSnapshotInterval } if runtimeCfg.RaftTrailingLogs != 0 { cfg.RaftConfig.TrailingLogs = uint64(runtimeCfg.RaftTrailingLogs) } if runtimeCfg.ACLInitialManagementToken != "" { cfg.ACLInitialManagementToken = runtimeCfg.ACLInitialManagementToken } cfg.ACLTokenReplication = runtimeCfg.ACLTokenReplication cfg.ACLsEnabled = runtimeCfg.ACLsEnabled if runtimeCfg.ACLEnableKeyListPolicy { cfg.ACLEnableKeyListPolicy = runtimeCfg.ACLEnableKeyListPolicy } if runtimeCfg.SessionTTLMin != 0 { cfg.SessionTTLMin = runtimeCfg.SessionTTLMin } if runtimeCfg.ReadReplica { cfg.ReadReplica = runtimeCfg.ReadReplica } // These are fully specified in the agent defaults, so we can simply // copy them over. cfg.AutopilotConfig.CleanupDeadServers = runtimeCfg.AutopilotCleanupDeadServers cfg.AutopilotConfig.LastContactThreshold = runtimeCfg.AutopilotLastContactThreshold cfg.AutopilotConfig.MaxTrailingLogs = uint64(runtimeCfg.AutopilotMaxTrailingLogs) cfg.AutopilotConfig.MinQuorum = runtimeCfg.AutopilotMinQuorum cfg.AutopilotConfig.ServerStabilizationTime = runtimeCfg.AutopilotServerStabilizationTime cfg.AutopilotConfig.RedundancyZoneTag = runtimeCfg.AutopilotRedundancyZoneTag cfg.AutopilotConfig.DisableUpgradeMigration = runtimeCfg.AutopilotDisableUpgradeMigration cfg.AutopilotConfig.UpgradeVersionTag = runtimeCfg.AutopilotUpgradeVersionTag // make sure the advertise address is always set if cfg.RPCAdvertise == nil { cfg.RPCAdvertise = cfg.RPCAddr } // Rate limiting for RPC calls. if runtimeCfg.RPCRateLimit > 0 { cfg.RPCRateLimit = runtimeCfg.RPCRateLimit } if runtimeCfg.RPCMaxBurst > 0 { cfg.RPCMaxBurst = runtimeCfg.RPCMaxBurst } // RPC timeouts/limits. if runtimeCfg.RPCHandshakeTimeout > 0 { cfg.RPCHandshakeTimeout = runtimeCfg.RPCHandshakeTimeout } if runtimeCfg.RPCMaxConnsPerClient > 0 { cfg.RPCMaxConnsPerClient = runtimeCfg.RPCMaxConnsPerClient } // RPC-related performance configs. We allow explicit zero value to disable so // copy it whatever the value. cfg.RPCHoldTimeout = runtimeCfg.RPCHoldTimeout cfg.RPCClientTimeout = runtimeCfg.RPCClientTimeout cfg.RPCConfig = runtimeCfg.RPCConfig if runtimeCfg.LeaveDrainTime > 0 { cfg.LeaveDrainTime = runtimeCfg.LeaveDrainTime } // set the src address for outgoing rpc connections // Use port 0 so that outgoing connections use a random port. if !ipaddr.IsAny(cfg.RPCAddr.IP) { cfg.RPCSrcAddr = &net.TCPAddr{IP: cfg.RPCAddr.IP} } // Format the build string revision := runtimeCfg.Revision if len(revision) > 8 { revision = revision[:8] } cfg.Build = fmt.Sprintf("%s%s:%s", runtimeCfg.VersionWithMetadata(), runtimeCfg.VersionPrerelease, revision) cfg.TLSConfig = runtimeCfg.TLS cfg.DefaultQueryTime = runtimeCfg.DefaultQueryTime cfg.MaxQueryTime = runtimeCfg.MaxQueryTime cfg.AutoEncryptAllowTLS = runtimeCfg.AutoEncryptAllowTLS // Copy the Connect CA bootstrap runtimeCfg if runtimeCfg.ConnectEnabled { cfg.ConnectEnabled = true cfg.ConnectMeshGatewayWANFederationEnabled = runtimeCfg.ConnectMeshGatewayWANFederationEnabled ca, err := runtimeCfg.ConnectCAConfiguration() if err != nil { return nil, err } cfg.CAConfig = ca } // copy over auto runtimeCfg settings cfg.AutoConfigEnabled = runtimeCfg.AutoConfig.Enabled cfg.AutoConfigIntroToken = runtimeCfg.AutoConfig.IntroToken cfg.AutoConfigIntroTokenFile = runtimeCfg.AutoConfig.IntroTokenFile cfg.AutoConfigServerAddresses = runtimeCfg.AutoConfig.ServerAddresses cfg.AutoConfigDNSSANs = runtimeCfg.AutoConfig.DNSSANs cfg.AutoConfigIPSANs = runtimeCfg.AutoConfig.IPSANs cfg.AutoConfigAuthzEnabled = runtimeCfg.AutoConfig.Authorizer.Enabled cfg.AutoConfigAuthzAuthMethod = runtimeCfg.AutoConfig.Authorizer.AuthMethod cfg.AutoConfigAuthzClaimAssertions = runtimeCfg.AutoConfig.Authorizer.ClaimAssertions cfg.AutoConfigAuthzAllowReuse = runtimeCfg.AutoConfig.Authorizer.AllowReuse // This will set up the LAN keyring, as well as the WAN and any segments // for servers. // TODO: move this closer to where the keyrings will be used. if err := setupKeyrings(cfg, runtimeCfg, logger); err != nil { return nil, fmt.Errorf("Failed to configure keyring: %v", err) } cfg.ConfigEntryBootstrap = runtimeCfg.ConfigEntryBootstrap cfg.LogStoreConfig = runtimeCfg.RaftLogStoreConfig // Duplicate our own serf config once to make sure that the duplication // function does not drift. cfg.SerfLANConfig = consul.CloneSerfLANConfig(cfg.SerfLANConfig) cfg.PeeringEnabled = runtimeCfg.PeeringEnabled cfg.PeeringTestAllowPeerRegistrations = runtimeCfg.PeeringTestAllowPeerRegistrations cfg.RequestLimitsMode = runtimeCfg.RequestLimitsMode.String() cfg.RequestLimitsReadRate = runtimeCfg.RequestLimitsReadRate cfg.RequestLimitsWriteRate = runtimeCfg.RequestLimitsWriteRate cfg.Locality = runtimeCfg.StructLocality() cfg.Cloud.ManagementToken = runtimeCfg.Cloud.ManagementToken cfg.Reporting.License.Enabled = runtimeCfg.Reporting.License.Enabled cfg.ServerRejoinAgeMax = runtimeCfg.ServerRejoinAgeMax enterpriseConsulConfig(cfg, runtimeCfg) return cfg, nil } // Setup the serf and memberlist config for any defined network segments. func segmentConfig(config *config.RuntimeConfig) ([]consul.NetworkSegment, error) { var segments []consul.NetworkSegment for _, s := range config.Segments { // TODO: use consul.CloneSerfLANConfig(config.SerfLANConfig) here? serfConf := consul.DefaultConfig().SerfLANConfig serfConf.MemberlistConfig.BindAddr = s.Bind.IP.String() serfConf.MemberlistConfig.BindPort = s.Bind.Port serfConf.MemberlistConfig.AdvertiseAddr = s.Advertise.IP.String() serfConf.MemberlistConfig.AdvertisePort = s.Advertise.Port serfConf.MemberlistConfig.CIDRsAllowed = config.SerfAllowedCIDRsLAN if config.ReconnectTimeoutLAN != 0 { serfConf.ReconnectTimeout = config.ReconnectTimeoutLAN } if config.StaticRuntimeConfig.EncryptVerifyIncoming { serfConf.MemberlistConfig.GossipVerifyIncoming = config.StaticRuntimeConfig.EncryptVerifyIncoming } if config.StaticRuntimeConfig.EncryptVerifyOutgoing { serfConf.MemberlistConfig.GossipVerifyOutgoing = config.StaticRuntimeConfig.EncryptVerifyOutgoing } var rpcAddr *net.TCPAddr if s.RPCListener { rpcAddr = &net.TCPAddr{ IP: s.Bind.IP, Port: config.ServerPort, } } segments = append(segments, consul.NetworkSegment{ Name: s.Name, Bind: serfConf.MemberlistConfig.BindAddr, Advertise: serfConf.MemberlistConfig.AdvertiseAddr, Port: s.Bind.Port, RPCAddr: rpcAddr, SerfConfig: serfConf, }) } return segments, nil } // registerEndpoint registers a handler for the consul RPC server // under a unique name while making it accessible under the provided // name. This allows overwriting handlers for the golang net/rpc // service which does not allow this. func (a *Agent) registerEndpoint(name string, handler interface{}) error { srv, ok := a.delegate.(*consul.Server) if !ok { panic("agent must be a server") } realname := fmt.Sprintf("%s-%d", name, time.Now().UnixNano()) a.endpointsLock.Lock() a.endpoints[name] = realname a.endpointsLock.Unlock() return srv.RegisterEndpoint(realname, handler) } // RPC is used to make an RPC call to the Consul servers // This allows the agent to implement the Consul.Interface func (a *Agent) RPC(ctx context.Context, method string, args interface{}, reply interface{}) error { a.endpointsLock.RLock() // fast path: only translate if there are overrides if len(a.endpoints) > 0 { p := strings.SplitN(method, ".", 2) if e := a.endpoints[p[0]]; e != "" { method = e + "." + p[1] } } // audit log only on consul clients _, ok := a.delegate.(*consul.Client) if ok { a.writeAuditRPCEvent(method, "OperationStart") } a.endpointsLock.RUnlock() defer func() { a.writeAuditRPCEvent(method, "OperationComplete") }() return a.delegate.RPC(ctx, method, args, reply) } // Leave is used to prepare the agent for a graceful shutdown func (a *Agent) Leave() error { return a.delegate.Leave() } // ShutdownAgent is used to hard stop the agent. Should be preceded by // Leave to do it gracefully. Should be followed by ShutdownEndpoints to // terminate the HTTP and DNS servers as well. func (a *Agent) ShutdownAgent() error { a.shutdownLock.Lock() defer a.shutdownLock.Unlock() if a.shutdown { return nil } a.logger.Info("Requesting shutdown") // Stop the watches to avoid any notification/state change during shutdown a.stopAllWatches() // Stop config file watcher if a.configFileWatcher != nil { a.configFileWatcher.Stop() } a.stopLicenseManager() a.baseDeps.Close() a.stateLock.Lock() defer a.stateLock.Unlock() // Stop the service manager (must happen before we take the stateLock to avoid deadlock) if a.serviceManager != nil { a.serviceManager.Stop() } // Stop all the checks for _, chk := range a.checkMonitors { chk.Stop() } for _, chk := range a.checkTTLs { chk.Stop() } for _, chk := range a.checkHTTPs { chk.Stop() } for _, chk := range a.checkTCPs { chk.Stop() } for _, chk := range a.checkUDPs { chk.Stop() } for _, chk := range a.checkGRPCs { chk.Stop() } for _, chk := range a.checkDockers { chk.Stop() } for _, chk := range a.checkAliases { chk.Stop() } for _, chk := range a.checkH2PINGs { chk.Stop() } // Stop gRPC if a.externalGRPCServer != nil { a.externalGRPCServer.Stop() } // Stop the proxy config manager if a.proxyConfig != nil { a.proxyConfig.Close() } // Stop the cache background work if a.cache != nil { a.cache.Close() } a.rpcClientHealth.Close() a.rpcClientConfigEntry.Close() // Shutdown SCADA provider if a.scadaProvider != nil { a.scadaProvider.Stop() } var err error if a.delegate != nil { err = a.delegate.Shutdown() if _, ok := a.delegate.(*consul.Server); ok { a.logger.Info("consul server down") } else { a.logger.Info("consul client down") } } pidErr := a.deletePid() if pidErr != nil { a.logger.Warn("could not delete pid file", "error", pidErr) } a.logger.Info("shutdown complete") a.shutdown = true close(a.shutdownCh) return err } // ShutdownEndpoints terminates the HTTP and DNS servers. Should be // preceded by ShutdownAgent. // TODO: remove this method, move to ShutdownAgent func (a *Agent) ShutdownEndpoints() { a.shutdownLock.Lock() defer a.shutdownLock.Unlock() ctx := context.TODO() for _, srv := range a.dnsServers { if srv.Server != nil { a.logger.Info("Stopping server", "protocol", "DNS", "address", srv.Server.Addr, "network", srv.Server.Net, ) srv.Shutdown() } } a.dnsServers = nil a.apiServers.Shutdown(ctx) a.logger.Info("Waiting for endpoints to shut down") if err := a.apiServers.WaitForShutdown(); err != nil { a.logger.Error(err.Error()) } a.logger.Info("Endpoints down") } // RetryJoinCh is a channel that transports errors // from the retry join process. func (a *Agent) RetryJoinCh() <-chan error { return a.retryJoinCh } // ShutdownCh is used to return a channel that can be // selected to wait for the agent to perform a shutdown. func (a *Agent) ShutdownCh() <-chan struct{} { return a.shutdownCh } // JoinLAN is used to have the agent join a LAN cluster func (a *Agent) JoinLAN(addrs []string, entMeta *acl.EnterpriseMeta) (n int, err error) { a.logger.Info("(LAN) joining", "lan_addresses", addrs) n, err = a.delegate.JoinLAN(addrs, entMeta) if err == nil { a.logger.Info("(LAN) joined", "number_of_nodes", n) if a.joinLANNotifier != nil { if notifErr := a.joinLANNotifier.Notify(systemd.Ready); notifErr != nil { a.logger.Debug("systemd notify failed", "error", notifErr) } } } else { a.logger.Warn("(LAN) couldn't join", "number_of_nodes", n, "error", err, ) } return } // JoinWAN is used to have the agent join a WAN cluster func (a *Agent) JoinWAN(addrs []string) (n int, err error) { a.logger.Info("(WAN) joining", "wan_addresses", addrs) if srv, ok := a.delegate.(*consul.Server); ok { n, err = srv.JoinWAN(addrs) } else { err = fmt.Errorf("Must be a server to join WAN cluster") } if err == nil { a.logger.Info("(WAN) joined", "number_of_nodes", n) } else { a.logger.Warn("(WAN) couldn't join", "number_of_nodes", n, "error", err, ) } return } // PrimaryMeshGatewayAddressesReadyCh returns a channel that will be closed // when federation state replication ships back at least one primary mesh // gateway (not via fallback config). func (a *Agent) PrimaryMeshGatewayAddressesReadyCh() <-chan struct{} { if srv, ok := a.delegate.(*consul.Server); ok { return srv.PrimaryMeshGatewayAddressesReadyCh() } return nil } // PickRandomMeshGatewaySuitableForDialing is a convenience function used for writing tests. func (a *Agent) PickRandomMeshGatewaySuitableForDialing(dc string) string { if srv, ok := a.delegate.(*consul.Server); ok { return srv.PickRandomMeshGatewaySuitableForDialing(dc) } return "" } // RefreshPrimaryGatewayFallbackAddresses is used to update the list of current // fallback addresses for locating mesh gateways in the primary datacenter. func (a *Agent) RefreshPrimaryGatewayFallbackAddresses(addrs []string) error { if srv, ok := a.delegate.(*consul.Server); ok { srv.RefreshPrimaryGatewayFallbackAddresses(addrs) return nil } return fmt.Errorf("Must be a server to track mesh gateways in the primary datacenter") } // ForceLeave is used to remove a failed node from the cluster func (a *Agent) ForceLeave(node string, prune bool, entMeta *acl.EnterpriseMeta) error { a.logger.Info("Force leaving node", "node", node) err := a.delegate.RemoveFailedNode(node, prune, entMeta) if err != nil { a.logger.Warn("Failed to remove node", "node", node, "error", err, ) } return err } // ForceLeaveWAN is used to remove a failed node from the WAN cluster func (a *Agent) ForceLeaveWAN(node string, prune bool, entMeta *acl.EnterpriseMeta) error { a.logger.Info("(WAN) Force leaving node", "node", node) srv, ok := a.delegate.(*consul.Server) if !ok { return fmt.Errorf("Must be a server to force-leave a node from the WAN cluster") } err := srv.RemoveFailedNodeWAN(node, prune, entMeta) if err != nil { a.logger.Warn("(WAN) Failed to remove node", "node", node, "error", err, ) } return err } // AgentLocalMember is used to retrieve the LAN member for the local node. func (a *Agent) AgentLocalMember() serf.Member { return a.delegate.AgentLocalMember() } // LANMembersInAgentPartition is used to retrieve the LAN members for this // agent's partition. func (a *Agent) LANMembersInAgentPartition() []serf.Member { return a.delegate.LANMembersInAgentPartition() } // LANMembers returns the LAN members for one of: // // - the requested partition // - the requested segment // - all segments // // This is limited to segments and partitions that the node is a member of. func (a *Agent) LANMembers(f consul.LANMemberFilter) ([]serf.Member, error) { return a.delegate.LANMembers(f) } // WANMembers is used to retrieve the WAN members func (a *Agent) WANMembers() []serf.Member { if srv, ok := a.delegate.(*consul.Server); ok { return srv.WANMembers() } return nil } // StartSync is called once Services and Checks are registered. // This is called to prevent a race between clients and the anti-entropy routines func (a *Agent) StartSync() { go a.sync.Run() a.logger.Info("started state syncer") } // PauseSync is used to pause anti-entropy while bulk changes are made. It also // sets state that agent-local watches use to "ride out" config reloads and bulk // updates which might spuriously unload state and reload it again. func (a *Agent) PauseSync() { // Do this outside of lock as it has it's own locking a.sync.Pause() // Coordinate local state watchers a.syncMu.Lock() defer a.syncMu.Unlock() if a.syncCh == nil { a.syncCh = make(chan struct{}) } } // ResumeSync is used to unpause anti-entropy after bulk changes are make func (a *Agent) ResumeSync() { // a.sync maintains a stack/ref count of Pause calls since we call // Pause/Resume in nested way during a reload and AddService. We only want to // trigger local state watchers if this Resume call actually started sync back // up again (i.e. was the last resume on the stack). We could check that // separately with a.sync.Paused but that is racey since another Pause call // might be made between our Resume and checking Paused. resumed := a.sync.Resume() if !resumed { // Return early so we don't notify local watchers until we are actually // resumed. return } // Coordinate local state watchers a.syncMu.Lock() defer a.syncMu.Unlock() if a.syncCh != nil { close(a.syncCh) a.syncCh = nil } } // SyncPausedCh returns either a channel or nil. If nil sync is not paused. If // non-nil, the channel will be closed when sync resumes. func (a *Agent) SyncPausedCh() <-chan struct{} { a.syncMu.Lock() defer a.syncMu.Unlock() return a.syncCh } // GetLANCoordinate returns the coordinates of this node in the local pools // (assumes coordinates are enabled, so check that before calling). func (a *Agent) GetLANCoordinate() (lib.CoordinateSet, error) { return a.delegate.GetLANCoordinate() } // sendCoordinate is a long-running loop that periodically sends our coordinate // to the server. Closing the agent's shutdownChannel will cause this to exit. func (a *Agent) sendCoordinate() { OUTER: for { rate := a.config.SyncCoordinateRateTarget min := a.config.SyncCoordinateIntervalMin intv := lib.RateScaledInterval(rate, min, len(a.LANMembersInAgentPartition())) intv = intv + lib.RandomStagger(intv) select { case <-time.After(intv): members := a.LANMembersInAgentPartition() grok, err := consul.CanServersUnderstandProtocol(members, 3) if err != nil { a.logger.Error("Failed to check servers", "error", err) continue } if !grok { a.logger.Debug("Skipping coordinate updates until servers are upgraded") continue } cs, err := a.GetLANCoordinate() if err != nil { a.logger.Error("Failed to get coordinate", "error", err) continue } for segment, coord := range cs { agentToken := a.tokens.AgentToken() req := structs.CoordinateUpdateRequest{ Datacenter: a.config.Datacenter, Node: a.config.NodeName, Segment: segment, Coord: coord, EnterpriseMeta: *a.AgentEnterpriseMeta(), WriteRequest: structs.WriteRequest{Token: agentToken}, } var reply struct{} if err := a.RPC(context.Background(), "Coordinate.Update", &req, &reply); err != nil { if acl.IsErrPermissionDenied(err) { accessorID := a.aclAccessorID(agentToken) a.logger.Warn("Coordinate update blocked by ACLs", "accessorID", acl.AliasIfAnonymousToken(accessorID)) } else { a.logger.Error("Coordinate update error", "error", err) } continue OUTER } } case <-a.shutdownCh: return } } } // reapServicesInternal does a single pass, looking for services to reap. func (a *Agent) reapServicesInternal() { reaped := make(map[structs.ServiceID]bool) for checkID, cs := range a.State.AllCriticalCheckStates() { serviceID := cs.Check.CompoundServiceID() // There's nothing to do if there's no service. if serviceID.ID == "" { continue } // There might be multiple checks for one service, so // we don't need to reap multiple times. if reaped[serviceID] { continue } // See if there's a timeout. // todo(fs): this looks fishy... why is there another data structure in the agent with its own lock? a.stateLock.Lock() timeout := a.checkReapAfter[checkID] a.stateLock.Unlock() // Reap, if necessary. We keep track of which service // this is so that we won't try to remove it again. if timeout > 0 && cs.CriticalFor() > timeout { reaped[serviceID] = true if err := a.RemoveService(serviceID); err != nil { a.logger.Error("failed to deregister service with critical health that exceeded health check's 'deregister_critical_service_after' timeout", "service", serviceID.String(), "check", checkID.String(), "timeout", timeout.String(), "error", err, ) } else { a.logger.Info("deregistered service with critical health due to exceeding health check's 'deregister_critical_service_after' timeout", "service", serviceID.String(), "check", checkID.String(), "timeout", timeout.String(), ) } } } } // reapServices is a long running goroutine that looks for checks that have been // critical too long and deregisters their associated services. func (a *Agent) reapServices() { for { select { case <-time.After(a.config.CheckReapInterval): a.reapServicesInternal() case <-a.shutdownCh: return } } } // persistedService is used to wrap a service definition and bundle it // with an ACL token so we can restore both at a later agent start. type persistedService struct { Token string Service *structs.NodeService Source string // whether this service was registered as a sidecar, see structs.NodeService // we store this field here because it is excluded from json serialization // to exclude it from API output, but we need it to properly deregister // persisted sidecars. LocallyRegisteredAsSidecar bool `json:",omitempty"` } func (a *Agent) makeServiceFilePath(svcID structs.ServiceID) string { return filepath.Join(a.config.DataDir, servicesDir, svcID.StringHashSHA256()) } // persistService saves a service definition to a JSON file in the data dir func (a *Agent) persistService(service *structs.NodeService, source configSource) error { svcID := service.CompoundServiceID() svcPath := a.makeServiceFilePath(svcID) wrapped := persistedService{ Token: a.State.ServiceToken(service.CompoundServiceID()), Service: service, Source: source.String(), LocallyRegisteredAsSidecar: service.LocallyRegisteredAsSidecar, } encoded, err := json.Marshal(wrapped) if err != nil { return err } return file.WriteAtomic(svcPath, encoded) } // purgeService removes a persisted service definition file from the data dir func (a *Agent) purgeService(serviceID structs.ServiceID) error { svcPath := a.makeServiceFilePath(serviceID) if _, err := os.Stat(svcPath); err == nil { return os.Remove(svcPath) } return nil } // persistCheck saves a check definition to the local agent's state directory func (a *Agent) persistCheck(check *structs.HealthCheck, chkType *structs.CheckType, source configSource) error { cid := check.CompoundCheckID() checkPath := filepath.Join(a.config.DataDir, checksDir, cid.StringHashSHA256()) // Create the persisted check wrapped := persistedCheck{ Check: check, ChkType: chkType, Token: a.State.CheckToken(check.CompoundCheckID()), Source: source.String(), } encoded, err := json.Marshal(wrapped) if err != nil { return err } return file.WriteAtomic(checkPath, encoded) } // purgeCheck removes a persisted check definition file from the data dir func (a *Agent) purgeCheck(checkID structs.CheckID) error { checkPath := filepath.Join(a.config.DataDir, checksDir, checkID.StringHashSHA256()) if _, err := os.Stat(checkPath); err == nil { return os.Remove(checkPath) } return nil } // persistedServiceConfig is used to serialize the resolved service config that // feeds into the ServiceManager at registration time so that it may be // restored later on. type persistedServiceConfig struct { ServiceID string Defaults *structs.ServiceConfigResponse acl.EnterpriseMeta } func (a *Agent) makeServiceConfigFilePath(serviceID structs.ServiceID) string { return filepath.Join(a.config.DataDir, serviceConfigDir, serviceID.StringHashSHA256()) } func (a *Agent) persistServiceConfig(serviceID structs.ServiceID, defaults *structs.ServiceConfigResponse) error { // Create the persisted config. wrapped := persistedServiceConfig{ ServiceID: serviceID.ID, Defaults: defaults, EnterpriseMeta: serviceID.EnterpriseMeta, } encoded, err := json.Marshal(wrapped) if err != nil { return err } dir := filepath.Join(a.config.DataDir, serviceConfigDir) configPath := a.makeServiceConfigFilePath(serviceID) // Create the config dir if it doesn't exist if err := os.MkdirAll(dir, 0700); err != nil { return fmt.Errorf("failed creating service configs dir %q: %s", dir, err) } return file.WriteAtomic(configPath, encoded) } func (a *Agent) purgeServiceConfig(serviceID structs.ServiceID) error { configPath := a.makeServiceConfigFilePath(serviceID) if _, err := os.Stat(configPath); err == nil { return os.Remove(configPath) } return nil } func (a *Agent) readPersistedServiceConfigs() (map[structs.ServiceID]*structs.ServiceConfigResponse, error) { out := make(map[structs.ServiceID]*structs.ServiceConfigResponse) configDir := filepath.Join(a.config.DataDir, serviceConfigDir) files, err := os.ReadDir(configDir) if err != nil { if os.IsNotExist(err) { return nil, nil } return nil, fmt.Errorf("Failed reading service configs dir %q: %s", configDir, err) } for _, fi := range files { // Skip all dirs if fi.IsDir() { continue } // Skip all partially written temporary files if strings.HasSuffix(fi.Name(), "tmp") { a.logger.Warn("Ignoring temporary service config file", "file", fi.Name()) continue } // Read the contents into a buffer file := filepath.Join(configDir, fi.Name()) buf, err := os.ReadFile(file) if err != nil { return nil, fmt.Errorf("failed reading service config file %q: %w", file, err) } // Try decoding the service config definition var p persistedServiceConfig if err := json.Unmarshal(buf, &p); err != nil { a.logger.Error("Failed decoding service config file", "file", file, "error", err, ) continue } serviceID := structs.NewServiceID(p.ServiceID, &p.EnterpriseMeta) // Rename files that used the old md5 hash to the new sha256 name; only needed when upgrading from 1.10 and before. newPath := a.makeServiceConfigFilePath(serviceID) if file != newPath { if err := os.Rename(file, newPath); err != nil { a.logger.Error("Failed renaming service config file", "file", file, "targetFile", newPath, "error", err, ) } } if acl.EqualPartitions("", p.PartitionOrEmpty()) { p.OverridePartition(a.AgentEnterpriseMeta().PartitionOrDefault()) } else if !acl.EqualPartitions(a.AgentEnterpriseMeta().PartitionOrDefault(), p.PartitionOrDefault()) { a.logger.Info("Purging service config file in wrong partition", "file", file, "partition", p.PartitionOrDefault(), ) if err := os.Remove(file); err != nil { a.logger.Error("Failed purging service config file", "file", file, "error", err, ) } continue } out[serviceID] = p.Defaults } return out, nil } // AddService is used to add a service entry and its check. Any check for this service missing from chkTypes will be deleted. // This entry is persistent and the agent will make a best effort to // ensure it is registered func (a *Agent) AddService(req AddServiceRequest) error { a.stateLock.Lock() defer a.stateLock.Unlock() rl := addServiceLockedRequest{ AddServiceRequest: req, serviceDefaults: serviceDefaultsFromCache(a.baseDeps, req), persistServiceConfig: true, } return a.addServiceLocked(rl) } // addServiceLocked adds a service entry to the service manager if enabled, or directly // to the local state if it is not. This function assumes the state lock is already held. func (a *Agent) addServiceLocked(req addServiceLockedRequest) error { // Must auto-assign the port and default checks (if needed) here to avoid race collisions. if req.Service.LocallyRegisteredAsSidecar { if req.Service.Port < 1 { port, err := a.sidecarPortFromServiceIDLocked(req.Service.CompoundServiceID()) if err != nil { return err } req.Service.Port = port } // Setup default check if none given. if len(req.chkTypes) < 1 { req.chkTypes = sidecarDefaultChecks(req.Service.ID, req.Service.Address, req.Service.Proxy.LocalServiceAddress, req.Service.Port) } } req.Service.EnterpriseMeta.Normalize() if err := a.validateService(req.Service, req.chkTypes); err != nil { return err } if a.config.EnableCentralServiceConfig && (req.Service.IsSidecarProxy() || req.Service.IsGateway()) { return a.serviceManager.AddService(req) } req.persistServiceConfig = false return a.addServiceInternal(addServiceInternalRequest{addServiceLockedRequest: req}) } type addServiceLockedRequest struct { AddServiceRequest persistServiceConfig bool // serviceDefaults is a function which will return centralized service // configuration. // When loading service definitions from disk this will return a copy // loaded from a persisted file. Otherwise it will query a Server for the // centralized config. // serviceDefaults is called when the Agent.stateLock is held, so it must // never attempt to acquire that lock. serviceDefaults func(context.Context) (*structs.ServiceConfigResponse, error) // checkStateSnapshot may optionally be set to a snapshot of the checks in // the local.State. If checkStateSnapshot is nil, addServiceInternal will // callState.Checks to get the snapshot. checkStateSnapshot map[structs.CheckID]*structs.HealthCheck } // AddServiceRequest contains the fields used to register a service on the local // agent using Agent.AddService. type AddServiceRequest struct { Service *structs.NodeService chkTypes []*structs.CheckType persist bool token string replaceExistingChecks bool Source configSource } type addServiceInternalRequest struct { addServiceLockedRequest // persistService may be set to a NodeService definition to indicate to // addServiceInternal that if persist=true, it should persist this definition // of the service, not the one from the Service field. This is necessary so // that the service is persisted without the serviceDefaults. persistService *structs.NodeService // persistServiceDefaults may be set to a ServiceConfigResponse to indicate to // addServiceInternal that it should persist the value in a file. persistServiceDefaults *structs.ServiceConfigResponse } // addServiceInternal adds the given service and checks to the local state. func (a *Agent) addServiceInternal(req addServiceInternalRequest) error { service := req.Service // Pause the service syncs during modification a.PauseSync() defer a.ResumeSync() // Set default tagged addresses serviceIP := net.ParseIP(service.Address) serviceAddressIs4 := serviceIP != nil && serviceIP.To4() != nil serviceAddressIs6 := serviceIP != nil && serviceIP.To4() == nil if service.TaggedAddresses == nil { service.TaggedAddresses = map[string]structs.ServiceAddress{} } if _, ok := service.TaggedAddresses[structs.TaggedAddressLANIPv4]; !ok && serviceAddressIs4 { service.TaggedAddresses[structs.TaggedAddressLANIPv4] = structs.ServiceAddress{Address: service.Address, Port: service.Port} } if _, ok := service.TaggedAddresses[structs.TaggedAddressWANIPv4]; !ok && serviceAddressIs4 { service.TaggedAddresses[structs.TaggedAddressWANIPv4] = structs.ServiceAddress{Address: service.Address, Port: service.Port} } if _, ok := service.TaggedAddresses[structs.TaggedAddressLANIPv6]; !ok && serviceAddressIs6 { service.TaggedAddresses[structs.TaggedAddressLANIPv6] = structs.ServiceAddress{Address: service.Address, Port: service.Port} } if _, ok := service.TaggedAddresses[structs.TaggedAddressWANIPv6]; !ok && serviceAddressIs6 { service.TaggedAddresses[structs.TaggedAddressWANIPv6] = structs.ServiceAddress{Address: service.Address, Port: service.Port} } var checks []*structs.HealthCheck // all the checks must be associated with the same enterprise meta of the service // so this map can just use the main CheckID for indexing existingChecks := map[structs.CheckID]bool{} for _, check := range a.State.ChecksForService(service.CompoundServiceID(), false) { existingChecks[check.CompoundCheckID()] = false } // Note, this is explicitly a nil check instead of len() == 0 because // Agent.Start does not have a snapshot, and we don't want to query // State.Checks each time. if req.checkStateSnapshot == nil { req.checkStateSnapshot = a.State.AllChecks() } // Create an associated health check for i, chkType := range req.chkTypes { checkID := string(chkType.CheckID) if checkID == "" { checkID = fmt.Sprintf("service:%s", service.ID) if len(req.chkTypes) > 1 { checkID += fmt.Sprintf(":%d", i+1) } } cid := structs.NewCheckID(types.CheckID(checkID), &service.EnterpriseMeta) existingChecks[cid] = true name := chkType.Name if name == "" { name = fmt.Sprintf("Service '%s' check", service.Service) } var intervalStr string var timeoutStr string if chkType.Interval != 0 { intervalStr = chkType.Interval.String() } if chkType.Timeout != 0 { timeoutStr = chkType.Timeout.String() } check := &structs.HealthCheck{ Node: a.config.NodeName, CheckID: types.CheckID(checkID), Name: name, Interval: intervalStr, Timeout: timeoutStr, Status: api.HealthCritical, Notes: chkType.Notes, ServiceID: service.ID, ServiceName: service.Service, ServiceTags: service.Tags, Type: chkType.Type(), EnterpriseMeta: service.EnterpriseMeta, } if chkType.Status != "" { check.Status = chkType.Status } // Restore the fields from the snapshot. prev, ok := req.checkStateSnapshot[cid] if ok { check.Output = prev.Output check.Status = prev.Status } checks = append(checks, check) } // cleanup, store the ids of services and checks that weren't previously // registered so we clean them up if something fails halfway through the // process. var cleanupServices []structs.ServiceID var cleanupChecks []structs.CheckID sid := service.CompoundServiceID() if s := a.State.Service(sid); s == nil { cleanupServices = append(cleanupServices, sid) } for _, check := range checks { cid := check.CompoundCheckID() if c := a.State.Check(cid); c == nil { cleanupChecks = append(cleanupChecks, cid) } } err := a.State.AddServiceWithChecks(service, checks, req.token, req.Source == ConfigSourceLocal) if err != nil { a.cleanupRegistration(cleanupServices, cleanupChecks) return err } source := req.Source persist := req.persist for i := range checks { if err := a.addCheck(checks[i], req.chkTypes[i], service, req.token, source); err != nil { a.cleanupRegistration(cleanupServices, cleanupChecks) return err } if persist && a.config.DataDir != "" { if err := a.persistCheck(checks[i], req.chkTypes[i], source); err != nil { a.cleanupRegistration(cleanupServices, cleanupChecks) return err } } } // If a proxy service wishes to expose checks, check targets need to be rerouted to the proxy listener // This needs to be called after chkTypes are added to the agent, to avoid being overwritten psid := structs.NewServiceID(service.Proxy.DestinationServiceID, &service.EnterpriseMeta) if service.Proxy.Expose.Checks { err := a.rerouteExposedChecks(psid, service.Address) if err != nil { a.logger.Warn("failed to reroute L7 checks to exposed proxy listener") } } else { // Reset check targets if proxy was re-registered but no longer wants to expose checks // If the proxy is being registered for the first time then this is a no-op a.resetExposedChecks(psid) } if req.persistServiceConfig && a.config.DataDir != "" { var err error if req.persistServiceDefaults != nil { err = a.persistServiceConfig(service.CompoundServiceID(), req.persistServiceDefaults) } else { err = a.purgeServiceConfig(service.CompoundServiceID()) } if err != nil { a.cleanupRegistration(cleanupServices, cleanupChecks) return err } } // Persist the service to a file if persist && a.config.DataDir != "" { if req.persistService == nil { req.persistService = service } if err := a.persistService(req.persistService, source); err != nil { a.cleanupRegistration(cleanupServices, cleanupChecks) return err } } if req.replaceExistingChecks { for checkID, keep := range existingChecks { if !keep { a.removeCheckLocked(checkID, persist) } } } return nil } // validateService validates an service and its checks, either returning an error or emitting a // warning based on the nature of the error. func (a *Agent) validateService(service *structs.NodeService, chkTypes []*structs.CheckType) error { if service.Service == "" { return fmt.Errorf("Service name missing") } if service.ID == "" && service.Service != "" { service.ID = service.Service } for _, check := range chkTypes { if err := check.Validate(); err != nil { return fmt.Errorf("Check is not valid: %v", err) } } // Set default weights if not specified. This is important as it ensures AE // doesn't consider the service different since it has nil weights. if service.Weights == nil { service.Weights = &structs.Weights{Passing: 1, Warning: 1} } // Warn if the service name is incompatible with DNS if dns.InvalidNameRe.MatchString(service.Service) { a.logger.Warn("Service name will not be discoverable "+ "via DNS due to invalid characters. Valid characters include "+ "all alpha-numerics and dashes.", "service", service.Service, ) } else if len(service.Service) > dns.MaxLabelLength { a.logger.Warn("Service name will not be discoverable "+ "via DNS due to it being too long. Valid lengths are between "+ "1 and 63 bytes.", "service", service.Service, ) } // Warn if any tags are incompatible with DNS for _, tag := range service.Tags { if dns.InvalidNameRe.MatchString(tag) { a.logger.Debug("Service tag will not be discoverable "+ "via DNS due to invalid characters. Valid characters include "+ "all alpha-numerics and dashes.", "tag", tag, ) } else if len(tag) > dns.MaxLabelLength { a.logger.Debug("Service tag will not be discoverable "+ "via DNS due to it being too long. Valid lengths are between "+ "1 and 63 bytes.", "tag", tag, ) } } // Check IPv4/IPv6 tagged addresses if service.TaggedAddresses != nil { if sa, ok := service.TaggedAddresses[structs.TaggedAddressLANIPv4]; ok { ip := net.ParseIP(sa.Address) if ip == nil || ip.To4() == nil { return fmt.Errorf("Service tagged address %q must be a valid ipv4 address", structs.TaggedAddressLANIPv4) } } if sa, ok := service.TaggedAddresses[structs.TaggedAddressWANIPv4]; ok { ip := net.ParseIP(sa.Address) if ip == nil || ip.To4() == nil { return fmt.Errorf("Service tagged address %q must be a valid ipv4 address", structs.TaggedAddressWANIPv4) } } if sa, ok := service.TaggedAddresses[structs.TaggedAddressLANIPv6]; ok { ip := net.ParseIP(sa.Address) if ip == nil || ip.To4() != nil { return fmt.Errorf("Service tagged address %q must be a valid ipv6 address", structs.TaggedAddressLANIPv6) } } if sa, ok := service.TaggedAddresses[structs.TaggedAddressLANIPv6]; ok { ip := net.ParseIP(sa.Address) if ip == nil || ip.To4() != nil { return fmt.Errorf("Service tagged address %q must be a valid ipv6 address", structs.TaggedAddressLANIPv6) } } } return nil } // cleanupRegistration is called on registration error to ensure no there are no // leftovers after a partial failure func (a *Agent) cleanupRegistration(serviceIDs []structs.ServiceID, checksIDs []structs.CheckID) { for _, s := range serviceIDs { if err := a.State.RemoveService(s); err != nil { a.logger.Error("failed to remove service during cleanup", "service", s.String(), "error", err, ) } if err := a.purgeService(s); err != nil { a.logger.Error("failed to purge service file during cleanup", "service", s.String(), "error", err, ) } if err := a.purgeServiceConfig(s); err != nil { a.logger.Error("failed to purge service config file during cleanup", "service", s, "error", err, ) } if err := a.removeServiceSidecars(s, true); err != nil { a.logger.Error("service registration: cleanup: failed remove sidecars for", "service", s, "error", err) } } for _, c := range checksIDs { a.cancelCheckMonitors(c) if err := a.State.RemoveCheck(c); err != nil { a.logger.Error("failed to remove check during cleanup", "check", c.String(), "error", err, ) } if err := a.purgeCheck(c); err != nil { a.logger.Error("failed to purge check file during cleanup", "check", c.String(), "error", err, ) } } } // RemoveService is used to remove a service entry. // The agent will make a best effort to ensure it is deregistered func (a *Agent) RemoveService(serviceID structs.ServiceID) error { return a.removeService(serviceID, true) } func (a *Agent) removeService(serviceID structs.ServiceID, persist bool) error { a.stateLock.Lock() defer a.stateLock.Unlock() return a.removeServiceLocked(serviceID, persist) } // removeServiceLocked is used to remove a service entry. // The agent will make a best effort to ensure it is deregistered func (a *Agent) removeServiceLocked(serviceID structs.ServiceID, persist bool) error { // Validate ServiceID if serviceID.ID == "" { return fmt.Errorf("ServiceID missing") } // Shut down the config watch in the service manager if enabled. if a.config.EnableCentralServiceConfig { a.serviceManager.RemoveService(serviceID) } // Reset the HTTP check targets if they were exposed through a proxy // If this is not a proxy or checks were not exposed then this is a no-op svc := a.State.Service(serviceID) if svc != nil { psid := structs.NewServiceID(svc.Proxy.DestinationServiceID, &svc.EnterpriseMeta) a.resetExposedChecks(psid) } checks := a.State.ChecksForService(serviceID, false) var checkIDs []structs.CheckID for id := range checks { checkIDs = append(checkIDs, id) } // Remove service immediately if err := a.State.RemoveServiceWithChecks(serviceID, checkIDs); err != nil { a.logger.Warn("Failed to deregister service", "service", serviceID.String(), "error", err, ) return nil } // Remove the service from the data dir if persist { if err := a.purgeService(serviceID); err != nil { return err } if err := a.purgeServiceConfig(serviceID); err != nil { return err } } // Deregister any associated health checks for checkID := range checks { if err := a.removeCheckLocked(checkID, persist); err != nil { return err } } a.logger.Debug("removed service", "service", serviceID.String()) // If any Sidecar services exist for the removed service ID, remove them too. return a.removeServiceSidecars(serviceID, persist) } func (a *Agent) removeServiceSidecars(serviceID structs.ServiceID, persist bool) error { sidecarSID := structs.NewServiceID(sidecarIDFromServiceID(serviceID.ID), &serviceID.EnterpriseMeta) if sidecar := a.State.Service(sidecarSID); sidecar != nil { // Double check that it's not just an ID collision and we actually added // this from a sidecar. if sidecar.LocallyRegisteredAsSidecar { // Remove it! err := a.removeServiceLocked(sidecarSID, persist) if err != nil { return err } } } return nil } // AddCheck is used to add a health check to the agent. // This entry is persistent and the agent will make a best effort to // ensure it is registered. The Check may include a CheckType which // is used to automatically update the check status func (a *Agent) AddCheck(check *structs.HealthCheck, chkType *structs.CheckType, persist bool, token string, source configSource) error { a.stateLock.Lock() defer a.stateLock.Unlock() return a.addCheckLocked(check, chkType, persist, token, source) } func (a *Agent) addCheckLocked(check *structs.HealthCheck, chkType *structs.CheckType, persist bool, token string, source configSource) error { var service *structs.NodeService check.EnterpriseMeta.Normalize() if check.ServiceID != "" { cid := check.CompoundServiceID() service = a.State.Service(cid) if service == nil { return fmt.Errorf("ServiceID %q does not exist", cid.String()) } } // Extra validations if err := check.Validate(); err != nil { return err } // snapshot the current state of the health check to avoid potential flapping cid := check.CompoundCheckID() existing := a.State.Check(cid) defer func() { if existing != nil { a.State.UpdateCheck(cid, existing.Status, existing.Output) } }() err := a.addCheck(check, chkType, service, token, source) if err != nil { a.State.RemoveCheck(cid) return err } // Add to the local state for anti-entropy err = a.State.AddCheck(check, token, source == ConfigSourceLocal) if err != nil { return err } // Persist the check if persist && a.config.DataDir != "" { return a.persistCheck(check, chkType, source) } return nil } func (a *Agent) addCheck(check *structs.HealthCheck, chkType *structs.CheckType, service *structs.NodeService, token string, source configSource) error { if check.CheckID == "" { return fmt.Errorf("CheckID missing") } if chkType != nil { if err := chkType.Validate(); err != nil { return fmt.Errorf("Check is not valid: %v", err) } if chkType.IsScript() { if source == ConfigSourceLocal && !a.config.EnableLocalScriptChecks { return fmt.Errorf("Scripts are disabled on this agent; to enable, configure 'enable_script_checks' or 'enable_local_script_checks' to true") } if source == ConfigSourceRemote && !a.config.EnableRemoteScriptChecks { return fmt.Errorf("Scripts are disabled on this agent from remote calls; to enable, configure 'enable_script_checks' to true") } } } if check.ServiceID != "" { check.ServiceName = service.Service check.ServiceTags = service.Tags check.EnterpriseMeta = service.EnterpriseMeta } // Check if already registered if chkType != nil { maxOutputSize := a.config.CheckOutputMaxSize if maxOutputSize == 0 { maxOutputSize = checks.DefaultBufSize } if chkType.OutputMaxSize > 0 && maxOutputSize > chkType.OutputMaxSize { maxOutputSize = chkType.OutputMaxSize } // FailuresBeforeWarning has to default to same value as FailuresBeforeCritical if chkType.FailuresBeforeWarning == 0 { chkType.FailuresBeforeWarning = chkType.FailuresBeforeCritical } // Get the address of the proxy for this service if it exists // Need its config to know whether we should reroute checks to it var proxy *structs.NodeService if service != nil { // NOTE: Both services must live in the same namespace and // partition so this will correctly scope the results. for _, svc := range a.State.Services(&service.EnterpriseMeta) { if svc.Proxy.DestinationServiceID == service.ID { proxy = svc break } } } statusHandler := checks.NewStatusHandler(a.State, a.logger, chkType.SuccessBeforePassing, chkType.FailuresBeforeWarning, chkType.FailuresBeforeCritical) sid := check.CompoundServiceID() cid := check.CompoundCheckID() switch { case chkType.IsTTL(): if existing, ok := a.checkTTLs[cid]; ok { existing.Stop() delete(a.checkTTLs, cid) } ttl := &checks.CheckTTL{ Notify: a.State, CheckID: cid, ServiceID: sid, TTL: chkType.TTL, Logger: a.logger, OutputMaxSize: maxOutputSize, } // Restore persisted state, if any if err := a.loadCheckState(check); err != nil { a.logger.Warn("failed restoring state for check", "check", cid.String(), "error", err, ) } ttl.Start() a.checkTTLs[cid] = ttl case chkType.IsHTTP(): if existing, ok := a.checkHTTPs[cid]; ok { existing.Stop() delete(a.checkHTTPs, cid) } if chkType.Interval < checks.MinInterval { a.logger.Warn("check has interval below minimum", "check", cid.String(), "minimum_interval", checks.MinInterval, ) chkType.Interval = checks.MinInterval } tlsClientConfig := a.tlsConfigurator.OutgoingTLSConfigForCheck(chkType.TLSSkipVerify, chkType.TLSServerName) http := &checks.CheckHTTP{ CheckID: cid, ServiceID: sid, HTTP: chkType.HTTP, Header: chkType.Header, Method: chkType.Method, Body: chkType.Body, DisableRedirects: chkType.DisableRedirects, Interval: chkType.Interval, Timeout: chkType.Timeout, Logger: a.logger, OutputMaxSize: maxOutputSize, TLSClientConfig: tlsClientConfig, StatusHandler: statusHandler, } if proxy != nil && proxy.Proxy.Expose.Checks { port, err := a.listenerPortLocked(sid, cid) if err != nil { a.logger.Error("error exposing check", "check", cid.String(), "error", err, ) return err } http.ProxyHTTP = httpInjectAddr(http.HTTP, proxy.Address, port) check.ExposedPort = port } http.Start() a.checkHTTPs[cid] = http case chkType.IsTCP(): if existing, ok := a.checkTCPs[cid]; ok { existing.Stop() delete(a.checkTCPs, cid) } if chkType.Interval < checks.MinInterval { a.logger.Warn("check has interval below minimum", "check", cid.String(), "minimum_interval", checks.MinInterval, ) chkType.Interval = checks.MinInterval } tcp := &checks.CheckTCP{ CheckID: cid, ServiceID: sid, TCP: chkType.TCP, Interval: chkType.Interval, Timeout: chkType.Timeout, Logger: a.logger, StatusHandler: statusHandler, } tcp.Start() a.checkTCPs[cid] = tcp case chkType.IsUDP(): if existing, ok := a.checkUDPs[cid]; ok { existing.Stop() delete(a.checkUDPs, cid) } if chkType.Interval < checks.MinInterval { a.logger.Warn("check has interval below minimum", "check", cid.String(), "minimum_interval", checks.MinInterval, ) chkType.Interval = checks.MinInterval } udp := &checks.CheckUDP{ CheckID: cid, ServiceID: sid, UDP: chkType.UDP, Interval: chkType.Interval, Timeout: chkType.Timeout, Logger: a.logger, StatusHandler: statusHandler, } udp.Start() a.checkUDPs[cid] = udp case chkType.IsGRPC(): if existing, ok := a.checkGRPCs[cid]; ok { existing.Stop() delete(a.checkGRPCs, cid) } if chkType.Interval < checks.MinInterval { a.logger.Warn("check has interval below minimum", "check", cid.String(), "minimum_interval", checks.MinInterval, ) chkType.Interval = checks.MinInterval } var tlsClientConfig *tls.Config if chkType.GRPCUseTLS { tlsClientConfig = a.tlsConfigurator.OutgoingTLSConfigForCheck(chkType.TLSSkipVerify, chkType.TLSServerName) } grpc := &checks.CheckGRPC{ CheckID: cid, ServiceID: sid, GRPC: chkType.GRPC, Interval: chkType.Interval, Timeout: chkType.Timeout, Logger: a.logger, TLSClientConfig: tlsClientConfig, StatusHandler: statusHandler, } if proxy != nil && proxy.Proxy.Expose.Checks { port, err := a.listenerPortLocked(sid, cid) if err != nil { a.logger.Error("error exposing check", "check", cid.String(), "error", err, ) return err } grpc.ProxyGRPC = grpcInjectAddr(grpc.GRPC, proxy.Address, port) check.ExposedPort = port } grpc.Start() a.checkGRPCs[cid] = grpc case chkType.IsDocker(): if existing, ok := a.checkDockers[cid]; ok { existing.Stop() delete(a.checkDockers, cid) } if chkType.Interval < checks.MinInterval { a.logger.Warn("check has interval below minimum", "check", cid.String(), "minimum_interval", checks.MinInterval, ) chkType.Interval = checks.MinInterval } if a.dockerClient == nil { dc, err := checks.NewDockerClient(os.Getenv("DOCKER_HOST"), int64(maxOutputSize)) if err != nil { a.logger.Error("error creating docker client", "error", err) return err } a.logger.Debug("created docker client", "host", dc.Host()) a.dockerClient = dc } dockerCheck := &checks.CheckDocker{ CheckID: cid, ServiceID: sid, DockerContainerID: chkType.DockerContainerID, Shell: chkType.Shell, ScriptArgs: chkType.ScriptArgs, Interval: chkType.Interval, Logger: a.logger, Client: a.dockerClient, StatusHandler: statusHandler, } dockerCheck.Start() a.checkDockers[cid] = dockerCheck case chkType.IsOSService(): if existing, ok := a.checkOSServices[cid]; ok { existing.Stop() delete(a.checkOSServices, cid) } if chkType.Interval < checks.MinInterval { a.logger.Warn("check has interval below minimum", "check", cid.String(), "minimum_interval", checks.MinInterval, ) chkType.Interval = checks.MinInterval } if a.osServiceClient == nil { ossp, err := checks.NewOSServiceClient() if err != nil { a.logger.Error("error creating OS Service client", "error", err) return err } a.logger.Debug("created OS Service client") a.osServiceClient = ossp } osServiceCheck := &checks.CheckOSService{ CheckID: cid, ServiceID: sid, OSService: chkType.OSService, Timeout: chkType.Timeout, Interval: chkType.Interval, Logger: a.logger, Client: a.osServiceClient, StatusHandler: statusHandler, } osServiceCheck.Start() a.checkOSServices[cid] = osServiceCheck case chkType.IsMonitor(): if existing, ok := a.checkMonitors[cid]; ok { existing.Stop() delete(a.checkMonitors, cid) } if chkType.Interval < checks.MinInterval { a.logger.Warn("check has interval below minimum", "check", cid.String(), "minimum_interval", checks.MinInterval, ) chkType.Interval = checks.MinInterval } monitor := &checks.CheckMonitor{ Notify: a.State, CheckID: cid, ServiceID: sid, ScriptArgs: chkType.ScriptArgs, Interval: chkType.Interval, Timeout: chkType.Timeout, Logger: a.logger, OutputMaxSize: maxOutputSize, StatusHandler: statusHandler, } monitor.Start() a.checkMonitors[cid] = monitor case chkType.IsH2PING(): if existing, ok := a.checkH2PINGs[cid]; ok { existing.Stop() delete(a.checkH2PINGs, cid) } if chkType.Interval < checks.MinInterval { a.logger.Warn("check has interval below minimum", "check", cid.String(), "minimum_interval", checks.MinInterval, ) chkType.Interval = checks.MinInterval } var tlsClientConfig *tls.Config if chkType.H2PingUseTLS { tlsClientConfig = a.tlsConfigurator.OutgoingTLSConfigForCheck(chkType.TLSSkipVerify, chkType.TLSServerName) tlsClientConfig.NextProtos = []string{http2.NextProtoTLS} } h2ping := &checks.CheckH2PING{ CheckID: cid, ServiceID: sid, H2PING: chkType.H2PING, Interval: chkType.Interval, Timeout: chkType.Timeout, Logger: a.logger, TLSClientConfig: tlsClientConfig, StatusHandler: statusHandler, } h2ping.Start() a.checkH2PINGs[cid] = h2ping case chkType.IsAlias(): if existing, ok := a.checkAliases[cid]; ok { existing.Stop() delete(a.checkAliases, cid) } var rpcReq structs.NodeSpecificRequest rpcReq.Datacenter = a.config.Datacenter rpcReq.EnterpriseMeta = *a.AgentEnterpriseMeta() // The token to set is really important. The behavior below follows // the same behavior as anti-entropy: we use the user-specified token // if set (either on the service or check definition), otherwise // we use the "UserToken" on the agent. This is tested. rpcReq.Token = a.tokens.UserToken() if token != "" { rpcReq.Token = token } aliasServiceID := structs.NewServiceID(chkType.AliasService, &check.EnterpriseMeta) chkImpl := &checks.CheckAlias{ Notify: a.State, RPC: a.delegate, RPCReq: rpcReq, CheckID: cid, Node: chkType.AliasNode, ServiceID: aliasServiceID, EnterpriseMeta: check.EnterpriseMeta, } chkImpl.Start() a.checkAliases[cid] = chkImpl default: return fmt.Errorf("Check type is not valid") } // Notify channel that watches for service state changes // This is a non-blocking send to avoid synchronizing on a large number of check updates s := a.State.ServiceState(sid) if s != nil && !s.Deleted { select { case s.WatchCh <- struct{}{}: default: } } if chkType.DeregisterCriticalServiceAfter > 0 { timeout := chkType.DeregisterCriticalServiceAfter if timeout < a.config.CheckDeregisterIntervalMin { timeout = a.config.CheckDeregisterIntervalMin a.logger.Warn("check has deregister interval below minimum", "check", cid.String(), "minimum_interval", a.config.CheckDeregisterIntervalMin, ) } a.checkReapAfter[cid] = timeout } else { delete(a.checkReapAfter, cid) } } return nil } // RemoveCheck is used to remove a health check. // The agent will make a best effort to ensure it is deregistered func (a *Agent) RemoveCheck(checkID structs.CheckID, persist bool) error { a.stateLock.Lock() defer a.stateLock.Unlock() return a.removeCheckLocked(checkID, persist) } // removeCheckLocked is used to remove a health check. // The agent will make a best effort to ensure it is deregistered func (a *Agent) removeCheckLocked(checkID structs.CheckID, persist bool) error { // Validate CheckID if checkID.ID == "" { return fmt.Errorf("CheckID missing") } // Notify channel that watches for service state changes // This is a non-blocking send to avoid synchronizing on a large number of check updates var svcID structs.ServiceID if c := a.State.Check(checkID); c != nil { svcID = c.CompoundServiceID() } s := a.State.ServiceState(svcID) if s != nil && !s.Deleted { select { case s.WatchCh <- struct{}{}: default: } } // Delete port from allocated port set // If checks weren't being exposed then this is a no-op portKey := listenerPortKey(svcID, checkID) delete(a.exposedPorts, portKey) a.cancelCheckMonitors(checkID) a.State.RemoveCheck(checkID) if persist { if err := a.purgeCheck(checkID); err != nil { return err } if err := a.purgeCheckState(checkID); err != nil { return err } } a.logger.Debug("removed check", "check", checkID.String()) return nil } // ServiceHTTPBasedChecks returns HTTP and GRPC based Checks // for the given serviceID func (a *Agent) ServiceHTTPBasedChecks(serviceID structs.ServiceID) []structs.CheckType { a.stateLock.Lock() defer a.stateLock.Unlock() var chkTypes = make([]structs.CheckType, 0) for _, c := range a.checkHTTPs { if c.ServiceID == serviceID { chkTypes = append(chkTypes, c.CheckType()) } } for _, c := range a.checkGRPCs { if c.ServiceID == serviceID { chkTypes = append(chkTypes, c.CheckType()) } } return chkTypes } // AdvertiseAddrLAN returns the AdvertiseAddrLAN config value func (a *Agent) AdvertiseAddrLAN() string { return a.config.AdvertiseAddrLAN.String() } func (a *Agent) cancelCheckMonitors(checkID structs.CheckID) { // Stop any monitors delete(a.checkReapAfter, checkID) if check, ok := a.checkMonitors[checkID]; ok { check.Stop() delete(a.checkMonitors, checkID) } if check, ok := a.checkHTTPs[checkID]; ok { check.Stop() delete(a.checkHTTPs, checkID) } if check, ok := a.checkTCPs[checkID]; ok { check.Stop() delete(a.checkTCPs, checkID) } if check, ok := a.checkUDPs[checkID]; ok { check.Stop() delete(a.checkUDPs, checkID) } if check, ok := a.checkGRPCs[checkID]; ok { check.Stop() delete(a.checkGRPCs, checkID) } if check, ok := a.checkTTLs[checkID]; ok { check.Stop() delete(a.checkTTLs, checkID) } if check, ok := a.checkDockers[checkID]; ok { check.Stop() delete(a.checkDockers, checkID) } if check, ok := a.checkH2PINGs[checkID]; ok { check.Stop() delete(a.checkH2PINGs, checkID) } if check, ok := a.checkAliases[checkID]; ok { check.Stop() delete(a.checkAliases, checkID) } } // updateTTLCheck is used to update the status of a TTL check via the Agent API. func (a *Agent) updateTTLCheck(checkID structs.CheckID, status, output string) error { a.stateLock.Lock() defer a.stateLock.Unlock() // Grab the TTL check. check, ok := a.checkTTLs[checkID] if !ok { return fmt.Errorf("CheckID %q does not have associated TTL", checkID.String()) } // Set the status through CheckTTL to reset the TTL. outputTruncated := check.SetStatus(status, output) // We don't write any files in dev mode so bail here. if a.config.DataDir == "" { return nil } // Persist the state so the TTL check can come up in a good state after // an agent restart, especially with long TTL values. if err := a.persistCheckState(check, status, outputTruncated); err != nil { return fmt.Errorf("failed persisting state for check %q: %s", checkID.String(), err) } return nil } // persistCheckState is used to record the check status into the data dir. // This allows the state to be restored on a later agent start. Currently // only useful for TTL based checks. func (a *Agent) persistCheckState(check *checks.CheckTTL, status, output string) error { // Create the persisted state state := persistedCheckState{ CheckID: check.CheckID.ID, Status: status, Output: output, Expires: time.Now().Add(check.TTL).Unix(), EnterpriseMeta: check.CheckID.EnterpriseMeta, } // Encode the state buf, err := json.Marshal(state) if err != nil { return err } // Create the state dir if it doesn't exist dir := filepath.Join(a.config.DataDir, checkStateDir) if err := os.MkdirAll(dir, 0700); err != nil { return fmt.Errorf("failed creating check state dir %q: %s", dir, err) } // Write the state to the file file := filepath.Join(dir, check.CheckID.StringHashSHA256()) // Create temp file in same dir, to make more likely atomic tempFile := file + ".tmp" // persistCheckState is called frequently, so don't use writeFileAtomic to avoid calling fsync here if err := os.WriteFile(tempFile, buf, 0600); err != nil { return fmt.Errorf("failed writing temp file %q: %s", tempFile, err) } if err := os.Rename(tempFile, file); err != nil { return fmt.Errorf("failed to rename temp file from %q to %q: %s", tempFile, file, err) } return nil } // loadCheckState is used to restore the persisted state of a check. func (a *Agent) loadCheckState(check *structs.HealthCheck) error { cid := check.CompoundCheckID() // Try to read the persisted state for this check file := filepath.Join(a.config.DataDir, checkStateDir, cid.StringHashSHA256()) buf, err := os.ReadFile(file) if err != nil { if os.IsNotExist(err) { // try the md5 based name. This can be removed once we no longer support upgrades from versions that use MD5 hashing oldFile := filepath.Join(a.config.DataDir, checkStateDir, cid.StringHashMD5()) buf, err = os.ReadFile(oldFile) if err != nil { if os.IsNotExist(err) { return nil } else { return fmt.Errorf("failed reading check state %q: %w", file, err) } } if err := os.Rename(oldFile, file); err != nil { a.logger.Error("Failed renaming check state", "file", oldFile, "targetFile", file, "error", err, ) } } else { return fmt.Errorf("failed reading file %q: %w", file, err) } } // Decode the state data var p persistedCheckState if err := json.Unmarshal(buf, &p); err != nil { a.logger.Error("failed decoding check state", "error", err) return a.purgeCheckState(cid) } // Check if the state has expired if time.Now().Unix() >= p.Expires { a.logger.Debug("check state expired, not restoring", "check", cid.String()) return a.purgeCheckState(cid) } // Restore the fields from the state check.Output = p.Output check.Status = p.Status return nil } // purgeCheckState is used to purge the state of a check from the data dir func (a *Agent) purgeCheckState(checkID structs.CheckID) error { file := filepath.Join(a.config.DataDir, checkStateDir, checkID.StringHashSHA256()) err := os.Remove(file) if os.IsNotExist(err) { return nil } return err } // Stats is used to get various debugging state from the sub-systems func (a *Agent) Stats() map[string]map[string]string { stats := a.delegate.Stats() stats["agent"] = map[string]string{ "check_monitors": strconv.Itoa(len(a.checkMonitors)), "check_ttls": strconv.Itoa(len(a.checkTTLs)), } for k, v := range a.State.Stats() { stats["agent"][k] = v } revision := a.config.Revision if len(revision) > 8 { revision = revision[:8] } stats["build"] = map[string]string{ "revision": revision, "version": a.config.Version, "version_metadata": a.config.VersionMetadata, "prerelease": a.config.VersionPrerelease, } for outerKey, outerValue := range a.enterpriseStats() { if _, ok := stats[outerKey]; ok { for innerKey, innerValue := range outerValue { stats[outerKey][innerKey] = innerValue } } else { stats[outerKey] = outerValue } } return stats } // storePid is used to write out our PID to a file if necessary func (a *Agent) storePid() error { // Quit fast if no pidfile pidPath := a.config.PidFile if pidPath == "" { return nil } // Open the PID file pidFile, err := os.OpenFile(pidPath, os.O_CREATE|os.O_WRONLY|os.O_TRUNC, 0666) if err != nil { return fmt.Errorf("Could not open pid file: %v", err) } defer pidFile.Close() // Write out the PID pid := os.Getpid() _, err = pidFile.WriteString(fmt.Sprintf("%d", pid)) if err != nil { return fmt.Errorf("Could not write to pid file: %s", err) } return nil } // deletePid is used to delete our PID on exit func (a *Agent) deletePid() error { // Quit fast if no pidfile pidPath := a.config.PidFile if pidPath == "" { return nil } stat, err := os.Stat(pidPath) if err != nil { return fmt.Errorf("Could not remove pid file: %s", err) } if stat.IsDir() { return fmt.Errorf("Specified pid file path is directory") } err = os.Remove(pidPath) if err != nil { return fmt.Errorf("Could not remove pid file: %s", err) } return nil } // loadServices will load service definitions from configuration and persisted // definitions on disk, and load them into the local agent. func (a *Agent) loadServices(conf *config.RuntimeConfig, snap map[structs.CheckID]*structs.HealthCheck) error { // Load any persisted service configs so we can feed those into the initial // registrations below. persistedServiceConfigs, err := a.readPersistedServiceConfigs() if err != nil { return err } // Register the services from config for _, service := range conf.Services { // Default service partition to the same as agent if service.EnterpriseMeta.PartitionOrEmpty() == "" { service.EnterpriseMeta.OverridePartition(a.AgentEnterpriseMeta().PartitionOrDefault()) } ns := service.NodeService() chkTypes, err := service.CheckTypes() if err != nil { return fmt.Errorf("Failed to validate checks for service %q: %v", service.Name, err) } // Grab and validate sidecar if there is one too sidecar, sidecarChecks, sidecarToken, err := sidecarServiceFromNodeService(ns, service.Token) if err != nil { return fmt.Errorf("Failed to validate sidecar for service %q: %v", service.Name, err) } // Remove sidecar from NodeService now it's done it's job it's just a config // syntax sugar and shouldn't be persisted in local or server state. ns.Connect.SidecarService = nil sid := ns.CompoundServiceID() err = a.addServiceLocked(addServiceLockedRequest{ AddServiceRequest: AddServiceRequest{ Service: ns, chkTypes: chkTypes, persist: false, // don't rewrite the file with the same data we just read token: service.Token, replaceExistingChecks: false, // do default behavior Source: ConfigSourceLocal, }, serviceDefaults: serviceDefaultsFromStruct(persistedServiceConfigs[sid]), persistServiceConfig: false, // don't rewrite the file with the same data we just read checkStateSnapshot: snap, }) if err != nil { return fmt.Errorf("Failed to register service %q: %v", service.Name, err) } // If there is a sidecar service, register that too. if sidecar != nil { sidecarServiceID := sidecar.CompoundServiceID() err = a.addServiceLocked(addServiceLockedRequest{ AddServiceRequest: AddServiceRequest{ Service: sidecar, chkTypes: sidecarChecks, persist: false, // don't rewrite the file with the same data we just read token: sidecarToken, replaceExistingChecks: false, // do default behavior Source: ConfigSourceLocal, }, serviceDefaults: serviceDefaultsFromStruct(persistedServiceConfigs[sidecarServiceID]), persistServiceConfig: false, // don't rewrite the file with the same data we just read checkStateSnapshot: snap, }) if err != nil { return fmt.Errorf("Failed to register sidecar for service %q: %v", service.Name, err) } } } // Load any persisted services svcDir := filepath.Join(a.config.DataDir, servicesDir) files, err := os.ReadDir(svcDir) if err != nil { if os.IsNotExist(err) { return nil } return fmt.Errorf("Failed reading services dir %q: %w", svcDir, err) } for _, fi := range files { // Skip all dirs if fi.IsDir() { continue } // Skip all partially written temporary files if strings.HasSuffix(fi.Name(), "tmp") { a.logger.Warn("Ignoring temporary service file", "file", fi.Name()) continue } // Read the contents into a buffer file := filepath.Join(svcDir, fi.Name()) buf, err := os.ReadFile(file) if err != nil { return fmt.Errorf("failed reading service file %q: %w", file, err) } // Try decoding the service definition var p persistedService if err := json.Unmarshal(buf, &p); err != nil { // Backwards-compatibility for pre-0.5.1 persisted services if err := json.Unmarshal(buf, &p.Service); err != nil { a.logger.Error("Failed decoding service file", "file", file, "error", err, ) continue } } // Rename files that used the old md5 hash to the new sha256 name; only needed when upgrading from 1.10 and before. newPath := a.makeServiceFilePath(p.Service.CompoundServiceID()) if file != newPath { if err := os.Rename(file, newPath); err != nil { a.logger.Error("Failed renaming service file", "file", file, "targetFile", newPath, "error", err, ) } } if acl.EqualPartitions("", p.Service.PartitionOrEmpty()) { // NOTE: in case loading a service with empty partition (e.g., CE -> ENT), // we always default the service partition to the agent's partition. p.Service.OverridePartition(a.AgentEnterpriseMeta().PartitionOrDefault()) } else if !acl.EqualPartitions(a.AgentEnterpriseMeta().PartitionOrDefault(), p.Service.PartitionOrDefault()) { a.logger.Info("Purging service file in wrong partition", "file", file, "partition", p.Service.EnterpriseMeta.PartitionOrDefault(), ) if err := os.Remove(file); err != nil { a.logger.Error("Failed purging service file", "file", file, "error", err, ) } continue } // Restore LocallyRegisteredAsSidecar, see persistedService.LocallyRegisteredAsSidecar p.Service.LocallyRegisteredAsSidecar = p.LocallyRegisteredAsSidecar serviceID := p.Service.CompoundServiceID() source, ok := ConfigSourceFromName(p.Source) if !ok { a.logger.Warn("service exists with invalid source, purging", "service", serviceID.String(), "source", p.Source, ) if err := a.purgeService(serviceID); err != nil { return fmt.Errorf("failed purging service %q: %w", serviceID, err) } if err := a.purgeServiceConfig(serviceID); err != nil { return fmt.Errorf("failed purging service config %q: %w", serviceID, err) } continue } if a.State.Service(serviceID) != nil { // Purge previously persisted service. This allows config to be // preferred over services persisted from the API. a.logger.Debug("service exists, not restoring from file", "service", serviceID.String(), "file", file, ) if err := a.purgeService(serviceID); err != nil { return fmt.Errorf("failed purging service %q: %w", serviceID.String(), err) } if err := a.purgeServiceConfig(serviceID); err != nil { return fmt.Errorf("failed purging service config %q: %w", serviceID.String(), err) } } else { a.logger.Debug("restored service definition from file", "service", serviceID.String(), "file", file, ) err = a.addServiceLocked(addServiceLockedRequest{ AddServiceRequest: AddServiceRequest{ Service: p.Service, chkTypes: nil, persist: false, // don't rewrite the file with the same data we just read token: p.Token, replaceExistingChecks: false, // do default behavior Source: source, }, serviceDefaults: serviceDefaultsFromStruct(persistedServiceConfigs[serviceID]), persistServiceConfig: false, // don't rewrite the file with the same data we just read checkStateSnapshot: snap, }) if err != nil { return fmt.Errorf("failed adding service %q: %w", serviceID, err) } } } for serviceID := range persistedServiceConfigs { if a.State.Service(serviceID) == nil { // This can be cleaned up now. if err := a.purgeServiceConfig(serviceID); err != nil { return fmt.Errorf("failed purging service config %q: %w", serviceID, err) } } } return nil } // unloadServices will deregister all services. func (a *Agent) unloadServices() error { for id := range a.State.AllServices() { if err := a.removeServiceLocked(id, false); err != nil { return fmt.Errorf("Failed deregistering service '%s': %v", id, err) } } return nil } // loadChecks loads check definitions and/or persisted check definitions from // disk and re-registers them with the local agent. func (a *Agent) loadChecks(conf *config.RuntimeConfig, snap map[structs.CheckID]*structs.HealthCheck) error { // Register the checks from config for _, check := range conf.Checks { health := check.HealthCheck(conf.NodeName) // Restore the fields from the snapshot. if prev, ok := snap[health.CompoundCheckID()]; ok { health.Output = prev.Output health.Status = prev.Status } chkType := check.CheckType() if err := a.addCheckLocked(health, chkType, false, check.Token, ConfigSourceLocal); err != nil { return fmt.Errorf("Failed to register check '%s': %v %v", check.Name, err, check) } } // Load any persisted checks checkDir := filepath.Join(a.config.DataDir, checksDir) files, err := os.ReadDir(checkDir) if err != nil { if os.IsNotExist(err) { return nil } return fmt.Errorf("Failed reading checks dir %q: %w", checkDir, err) } for _, fi := range files { // Ignore dirs - we only care about the check definition files if fi.IsDir() { continue } // Read the contents into a buffer file := filepath.Join(checkDir, fi.Name()) buf, err := os.ReadFile(file) if err != nil { return fmt.Errorf("failed reading check file %q: %w", file, err) } // Decode the check var p persistedCheck if err := json.Unmarshal(buf, &p); err != nil { a.logger.Error("Failed decoding check file", "file", file, "error", err, ) continue } checkID := p.Check.CompoundCheckID() // Rename files that used the old md5 hash to the new sha256 name; only needed when upgrading from 1.10 and before. newPath := filepath.Join(a.config.DataDir, checksDir, checkID.StringHashSHA256()) if file != newPath { if err := os.Rename(file, newPath); err != nil { a.logger.Error("Failed renaming check file", "file", file, "targetFile", newPath, "error", err, ) } } if !acl.EqualPartitions(a.AgentEnterpriseMeta().PartitionOrDefault(), p.Check.PartitionOrDefault()) { a.logger.Info("Purging check file in wrong partition", "file", file, "partition", p.Check.PartitionOrDefault(), ) if err := os.Remove(file); err != nil { return fmt.Errorf("failed purging check %q: %w", checkID, err) } continue } source, ok := ConfigSourceFromName(p.Source) if !ok { a.logger.Warn("check exists with invalid source, purging", "check", checkID.String(), "source", p.Source, ) if err := a.purgeCheck(checkID); err != nil { return fmt.Errorf("failed purging check %q: %w", checkID, err) } continue } if a.State.Check(checkID) != nil { // Purge previously persisted check. This allows config to be // preferred over persisted checks from the API. a.logger.Debug("check exists, not restoring from file", "check", checkID.String(), "file", file, ) if err := a.purgeCheck(checkID); err != nil { return fmt.Errorf("Failed purging check %q: %w", checkID, err) } } else { // Default check to critical to avoid placing potentially unhealthy // services into the active pool p.Check.Status = api.HealthCritical // Restore the fields from the snapshot. if prev, ok := snap[p.Check.CompoundCheckID()]; ok { p.Check.Output = prev.Output p.Check.Status = prev.Status } if err := a.addCheckLocked(p.Check, p.ChkType, false, p.Token, source); err != nil { // Purge the check if it is unable to be restored. a.logger.Warn("Failed to restore check", "check", checkID.String(), "error", err, ) if err := a.purgeCheck(checkID); err != nil { return fmt.Errorf("Failed purging check %q: %w", checkID, err) } } a.logger.Debug("restored health check from file", "check", p.Check.CheckID, "file", file, ) } } return nil } // unloadChecks will deregister all checks known to the local agent. func (a *Agent) unloadChecks() error { for id := range a.State.AllChecks() { if err := a.removeCheckLocked(id, false); err != nil { return fmt.Errorf("Failed deregistering check '%s': %s", id, err) } } return nil } // snapshotCheckState is used to snapshot the current state of the health // checks. This is done before we reload our checks, so that we can properly // restore into the same state. func (a *Agent) snapshotCheckState() map[structs.CheckID]*structs.HealthCheck { return a.State.AllChecks() } // loadMetadata loads node metadata fields from the agent config and // updates them on the local agent. func (a *Agent) loadMetadata(conf *config.RuntimeConfig) error { meta := map[string]string{} for k, v := range conf.NodeMeta { meta[k] = v } meta[structs.MetaSegmentKey] = conf.SegmentName meta[structs.MetaConsulVersion] = conf.Version return a.State.LoadMetadata(meta) } // unloadMetadata resets the local metadata state func (a *Agent) unloadMetadata() { a.State.UnloadMetadata() } // serviceMaintCheckID returns the ID of a given service's maintenance check func serviceMaintCheckID(serviceID structs.ServiceID) structs.CheckID { cid := types.CheckID(structs.ServiceMaintPrefix + serviceID.ID) return structs.NewCheckID(cid, &serviceID.EnterpriseMeta) } // EnableServiceMaintenance will register a false health check against the given // service ID with critical status. This will exclude the service from queries. func (a *Agent) EnableServiceMaintenance(serviceID structs.ServiceID, reason, token string) error { service := a.State.Service(serviceID) if service == nil { return fmt.Errorf("No service registered with ID %q", serviceID.String()) } // Check if maintenance mode is not already enabled checkID := serviceMaintCheckID(serviceID) if a.State.Check(checkID) != nil { return nil } // Use default notes if no reason provided if reason == "" { reason = defaultServiceMaintReason } // Create and register the critical health check check := &structs.HealthCheck{ Node: a.config.NodeName, CheckID: checkID.ID, Name: "Service Maintenance Mode", Notes: reason, ServiceID: service.ID, ServiceName: service.Service, Status: api.HealthCritical, Type: "maintenance", EnterpriseMeta: checkID.EnterpriseMeta, } a.AddCheck(check, nil, true, token, ConfigSourceLocal) a.logger.Info("Service entered maintenance mode", "service", serviceID.String()) return nil } // DisableServiceMaintenance will deregister the fake maintenance mode check // if the service has been marked as in maintenance. func (a *Agent) DisableServiceMaintenance(serviceID structs.ServiceID) error { if a.State.Service(serviceID) == nil { return fmt.Errorf("No service registered with ID %q", serviceID.String()) } // Check if maintenance mode is enabled checkID := serviceMaintCheckID(serviceID) if a.State.Check(checkID) == nil { // maintenance mode is not enabled return nil } // Deregister the maintenance check a.RemoveCheck(checkID, true) a.logger.Info("Service left maintenance mode", "service", serviceID.String()) return nil } // EnableNodeMaintenance places a node into maintenance mode. func (a *Agent) EnableNodeMaintenance(reason, token string) { // Ensure node maintenance is not already enabled if a.State.Check(structs.NodeMaintCheckID) != nil { return } // Use a default notes value if reason == "" { reason = defaultNodeMaintReason } // Create and register the node maintenance check check := &structs.HealthCheck{ Node: a.config.NodeName, CheckID: structs.NodeMaint, Name: "Node Maintenance Mode", Notes: reason, Status: api.HealthCritical, Type: "maintenance", } a.AddCheck(check, nil, true, token, ConfigSourceLocal) a.logger.Info("Node entered maintenance mode") } // DisableNodeMaintenance removes a node from maintenance mode func (a *Agent) DisableNodeMaintenance() { if a.State.Check(structs.NodeMaintCheckID) == nil { return } a.RemoveCheck(structs.NodeMaintCheckID, true) a.logger.Info("Node left maintenance mode") } func (a *Agent) AutoReloadConfig() error { return a.reloadConfig(true) } func (a *Agent) ReloadConfig() error { return a.reloadConfig(false) } // ReloadConfig will atomically reload all configuration, including // all services, checks, tokens, metadata, dnsServer configs, etc. // It will also reload all ongoing watches. func (a *Agent) reloadConfig(autoReload bool) error { newCfg, err := a.baseDeps.AutoConfig.ReadConfig() if err != nil { return err } // copy over the existing node id, this cannot be // changed while running anyways but this prevents // breaking some existing behavior. newCfg.NodeID = a.config.NodeID // if auto reload is enabled, make sure we have the right certs file watched. if autoReload { for _, f := range []struct { oldCfg tlsutil.ProtocolConfig newCfg tlsutil.ProtocolConfig }{ {a.config.TLS.InternalRPC, newCfg.TLS.InternalRPC}, {a.config.TLS.GRPC, newCfg.TLS.GRPC}, {a.config.TLS.HTTPS, newCfg.TLS.HTTPS}, } { if f.oldCfg.KeyFile != f.newCfg.KeyFile { a.configFileWatcher.Replace(f.oldCfg.KeyFile, f.newCfg.KeyFile) if err != nil { return err } } if f.oldCfg.CertFile != f.newCfg.CertFile { a.configFileWatcher.Replace(f.oldCfg.CertFile, f.newCfg.CertFile) if err != nil { return err } } if revertStaticConfig(f.oldCfg, f.newCfg) { a.logger.Warn("Changes to your configuration were detected that for security reasons cannot be automatically applied by 'auto_reload_config'. Manually reload your configuration (e.g. with 'consul reload') to apply these changes.", "StaticRuntimeConfig", f.oldCfg, "StaticRuntimeConfig From file", f.newCfg) } } if !reflect.DeepEqual(newCfg.StaticRuntimeConfig, a.config.StaticRuntimeConfig) { a.logger.Warn("Changes to your configuration were detected that for security reasons cannot be automatically applied by 'auto_reload_config'. Manually reload your configuration (e.g. with 'consul reload') to apply these changes.", "StaticRuntimeConfig", a.config.StaticRuntimeConfig, "StaticRuntimeConfig From file", newCfg.StaticRuntimeConfig) // reset not reloadable fields newCfg.StaticRuntimeConfig = a.config.StaticRuntimeConfig } } return a.reloadConfigInternal(newCfg) } func revertStaticConfig(oldCfg tlsutil.ProtocolConfig, newCfg tlsutil.ProtocolConfig) bool { newNewCfg := oldCfg newNewCfg.CertFile = newCfg.CertFile newNewCfg.KeyFile = newCfg.KeyFile newOldcfg := newCfg newOldcfg.CertFile = oldCfg.CertFile newOldcfg.KeyFile = oldCfg.KeyFile if !reflect.DeepEqual(newOldcfg, oldCfg) { return true } return false } // reloadConfigInternal is mainly needed for some unit tests. Instead of parsing // the configuration using CLI flags and on disk config, this just takes a // runtime configuration and applies it. func (a *Agent) reloadConfigInternal(newCfg *config.RuntimeConfig) error { // Change the log level and update it if logging.ValidateLogLevel(newCfg.Logging.LogLevel) { a.logger.SetLevel(logging.LevelFromString(newCfg.Logging.LogLevel)) } else { a.logger.Warn("Invalid log level in new configuration", "level", newCfg.Logging.LogLevel) newCfg.Logging.LogLevel = a.config.Logging.LogLevel } // Bulk update the services and checks a.PauseSync() defer a.ResumeSync() a.stateLock.Lock() defer a.stateLock.Unlock() // Snapshot the current state, and use that to initialize the checks when // they are recreated. snap := a.snapshotCheckState() // First unload all checks, services, and metadata. This lets us begin the reload // with a clean slate. if err := a.unloadServices(); err != nil { return fmt.Errorf("Failed unloading services: %s", err) } if err := a.unloadChecks(); err != nil { return fmt.Errorf("Failed unloading checks: %s", err) } a.unloadMetadata() // Reload tokens - should be done before all the other loading // to ensure the correct tokens are available for attaching to // the checks and service registrations. a.tokens.Load(newCfg.ACLTokens, a.logger) if err := a.tlsConfigurator.Update(newCfg.TLS); err != nil { return fmt.Errorf("Failed reloading tls configuration: %s", err) } // Reload service/check definitions and metadata. if err := a.loadServices(newCfg, snap); err != nil { return fmt.Errorf("Failed reloading services: %s", err) } if err := a.loadChecks(newCfg, snap); err != nil { return fmt.Errorf("Failed reloading checks: %s", err) } if err := a.loadMetadata(newCfg); err != nil { return fmt.Errorf("Failed reloading metadata: %s", err) } if err := a.reloadWatches(newCfg); err != nil { return fmt.Errorf("Failed reloading watches: %v", err) } a.httpConnLimiter.SetConfig(connlimit.Config{ MaxConnsPerClientIP: newCfg.HTTPMaxConnsPerClient, }) for _, s := range a.dnsServers { if err := s.ReloadConfig(newCfg); err != nil { return fmt.Errorf("Failed reloading dns config : %v", err) } } err := a.reloadEnterprise(newCfg) if err != nil { return err } cc := consul.ReloadableConfig{ RequestLimits: &consul.RequestLimits{ Mode: newCfg.RequestLimitsMode, ReadRate: newCfg.RequestLimitsReadRate, WriteRate: newCfg.RequestLimitsWriteRate, }, RPCClientTimeout: newCfg.RPCClientTimeout, RPCRateLimit: newCfg.RPCRateLimit, RPCMaxBurst: newCfg.RPCMaxBurst, RPCMaxConnsPerClient: newCfg.RPCMaxConnsPerClient, ConfigEntryBootstrap: newCfg.ConfigEntryBootstrap, RaftSnapshotThreshold: newCfg.RaftSnapshotThreshold, RaftSnapshotInterval: newCfg.RaftSnapshotInterval, HeartbeatTimeout: newCfg.ConsulRaftHeartbeatTimeout, ElectionTimeout: newCfg.ConsulRaftElectionTimeout, RaftTrailingLogs: newCfg.RaftTrailingLogs, Reporting: consul.Reporting{ License: consul.License{ Enabled: newCfg.Reporting.License.Enabled, }, }, } if err := a.delegate.ReloadConfig(cc); err != nil { return err } if a.cache.ReloadOptions(newCfg.Cache) { a.logger.Info("Cache options have been updated") } else { a.logger.Debug("Cache options have not been modified") } // Update filtered metrics metrics.UpdateFilter(newCfg.Telemetry.AllowedPrefixes, newCfg.Telemetry.BlockedPrefixes) a.State.SetDiscardCheckOutput(newCfg.DiscardCheckOutput) for _, r := range a.configReloaders { if err := r(newCfg); err != nil { return err } } a.proxyConfig.SetUpdateRateLimit(newCfg.XDSUpdateRateLimit) a.enableDebug.Store(newCfg.EnableDebug) a.config.EnableDebug = newCfg.EnableDebug return nil } // LocalBlockingQuery performs a blocking query in a generic way against // local agent state that has no RPC or raft to back it. It uses `hash` parameter // instead of an `index`. // `alwaysBlock` determines whether we block if the provided hash is empty. // Callers like the AgentService endpoint will want to return the current result if a hash isn't provided. // On the other hand, for cache notifications we always want to block. This avoids an empty first response. func (a *Agent) LocalBlockingQuery(alwaysBlock bool, hash string, wait time.Duration, fn func(ws memdb.WatchSet) (string, interface{}, error)) (string, interface{}, error) { // If we are not blocking we can skip tracking and allocating - nil WatchSet // is still valid to call Add on and will just be a no op. var ws memdb.WatchSet var ctx context.Context = &lib.StopChannelContext{StopCh: a.shutdownCh} shouldBlock := false if alwaysBlock || hash != "" { if wait == 0 { wait = defaultQueryTime } if wait > 10*time.Minute { wait = maxQueryTime } // Apply a small amount of jitter to the request. wait += lib.RandomStagger(wait / 16) var cancel func() ctx, cancel = context.WithDeadline(ctx, time.Now().Add(wait)) defer cancel() shouldBlock = true } for { // Must reset this every loop in case the Watch set is already closed but // hash remains same. In that case we'll need to re-block on ws.Watch() // again. ws = memdb.NewWatchSet() curHash, curResp, err := fn(ws) if err != nil { return "", curResp, err } // Return immediately if there is no timeout, the hash is different or the // Watch returns true (indicating timeout fired). Note that Watch on a nil // WatchSet immediately returns false which would incorrectly cause this to // loop and repeat again, however we rely on the invariant that ws == nil // IFF timeout == nil in which case the Watch call is never invoked. if !shouldBlock || hash != curHash || ws.WatchCtx(ctx) != nil { return curHash, curResp, err } // Watch returned false indicating a change was detected, loop and repeat // the callback to load the new value. If agent sync is paused it means // local state is currently being bulk-edited e.g. config reload. In this // case it's likely that local state just got unloaded and may or may not be // reloaded yet. Wait a short amount of time for Sync to resume to ride out // typical config reloads. if syncPauseCh := a.SyncPausedCh(); syncPauseCh != nil { select { case <-syncPauseCh: case <-ctx.Done(): } } } } // registerCache types on a.cache. // This function may only be called once from New. // // Note: this function no longer registered all cache-types. Newer cache-types // that do not depend on Agent are registered from registerCacheTypes. func (a *Agent) registerCache() { // Note that you should register the _agent_ as the RPC implementation and not // the a.delegate directly, otherwise tests that rely on overriding RPC // routing via a.registerEndpoint will not work. a.cache.RegisterType(cachetype.ConnectCARootName, &cachetype.ConnectCARoot{RPC: a}) a.cache.RegisterType(cachetype.IntentionMatchName, &cachetype.IntentionMatch{RPC: a}) a.cache.RegisterType(cachetype.IntentionUpstreamsName, &cachetype.IntentionUpstreams{RPC: a}) a.cache.RegisterType(cachetype.IntentionUpstreamsDestinationName, &cachetype.IntentionUpstreamsDestination{RPC: a}) a.cache.RegisterType(cachetype.CatalogServicesName, &cachetype.CatalogServices{RPC: a}) a.cache.RegisterType(cachetype.HealthServicesName, &cachetype.HealthServices{RPC: a}) a.cache.RegisterType(cachetype.PreparedQueryName, &cachetype.PreparedQuery{RPC: a}) a.cache.RegisterType(cachetype.NodeServicesName, &cachetype.NodeServices{RPC: a}) a.cache.RegisterType(cachetype.ResolvedServiceConfigName, &cachetype.ResolvedServiceConfig{RPC: a}) a.cache.RegisterType(cachetype.CatalogListServicesName, &cachetype.CatalogListServices{RPC: a}) a.cache.RegisterType(cachetype.CatalogServiceListName, &cachetype.CatalogServiceList{RPC: a}) a.cache.RegisterType(cachetype.CatalogDatacentersName, &cachetype.CatalogDatacenters{RPC: a}) a.cache.RegisterType(cachetype.InternalServiceDumpName, &cachetype.InternalServiceDump{RPC: a}) a.cache.RegisterType(cachetype.CompiledDiscoveryChainName, &cachetype.CompiledDiscoveryChain{RPC: a}) a.cache.RegisterType(cachetype.GatewayServicesName, &cachetype.GatewayServices{RPC: a}) a.cache.RegisterType(cachetype.ServiceGatewaysName, &cachetype.ServiceGateways{RPC: a}) a.cache.RegisterType(cachetype.ConfigEntryListName, &cachetype.ConfigEntryList{RPC: a}) a.cache.RegisterType(cachetype.ConfigEntryName, &cachetype.ConfigEntry{RPC: a}) a.cache.RegisterType(cachetype.ServiceHTTPChecksName, &cachetype.ServiceHTTPChecks{Agent: a}) a.cache.RegisterType(cachetype.TrustBundleReadName, &cachetype.TrustBundle{Client: a.rpcClientPeering}) a.cache.RegisterType(cachetype.ExportedPeeredServicesName, &cachetype.ExportedPeeredServices{RPC: a}) a.cache.RegisterType(cachetype.FederationStateListMeshGatewaysName, &cachetype.FederationStateListMeshGateways{RPC: a}) a.cache.RegisterType(cachetype.TrustBundleListName, &cachetype.TrustBundles{Client: a.rpcClientPeering}) a.cache.RegisterType(cachetype.PeeredUpstreamsName, &cachetype.PeeredUpstreams{RPC: a}) a.cache.RegisterType(cachetype.PeeringListName, &cachetype.Peerings{Client: a.rpcClientPeering}) a.registerEntCache() } // LocalState returns the agent's local state func (a *Agent) LocalState() *local.State { return a.State } // rerouteExposedChecks will inject proxy address into check targets // Future calls to check() will dial the proxy listener // The agent stateLock MUST be held for this to be called func (a *Agent) rerouteExposedChecks(serviceID structs.ServiceID, proxyAddr string) error { for cid, c := range a.checkHTTPs { if c.ServiceID != serviceID { continue } port, err := a.listenerPortLocked(serviceID, cid) if err != nil { return err } c.ProxyHTTP = httpInjectAddr(c.HTTP, proxyAddr, port) hc := a.State.Check(cid) hc.ExposedPort = port } for cid, c := range a.checkGRPCs { if c.ServiceID != serviceID { continue } port, err := a.listenerPortLocked(serviceID, cid) if err != nil { return err } c.ProxyGRPC = grpcInjectAddr(c.GRPC, proxyAddr, port) hc := a.State.Check(cid) hc.ExposedPort = port } return nil } // resetExposedChecks will set Proxy addr in HTTP checks to empty string // Future calls to check() will use the original target c.HTTP or c.GRPC // The agent stateLock MUST be held for this to be called func (a *Agent) resetExposedChecks(serviceID structs.ServiceID) { ids := make([]structs.CheckID, 0) for cid, c := range a.checkHTTPs { if c.ServiceID == serviceID { c.ProxyHTTP = "" hc := a.State.Check(cid) hc.ExposedPort = 0 ids = append(ids, cid) } } for cid, c := range a.checkGRPCs { if c.ServiceID == serviceID { c.ProxyGRPC = "" hc := a.State.Check(cid) hc.ExposedPort = 0 ids = append(ids, cid) } } for _, checkID := range ids { delete(a.exposedPorts, listenerPortKey(serviceID, checkID)) } } // listenerPort allocates a port from the configured range // The agent stateLock MUST be held when this is called func (a *Agent) listenerPortLocked(svcID structs.ServiceID, checkID structs.CheckID) (int, error) { key := listenerPortKey(svcID, checkID) if a.exposedPorts == nil { a.exposedPorts = make(map[string]int) } if p, ok := a.exposedPorts[key]; ok { return p, nil } allocated := make(map[int]bool) for _, v := range a.exposedPorts { allocated[v] = true } var port int for i := 0; i < a.config.ExposeMaxPort-a.config.ExposeMinPort; i++ { port = a.config.ExposeMinPort + i if !allocated[port] { a.exposedPorts[key] = port break } } if port == 0 { return 0, fmt.Errorf("no ports available to expose '%s'", checkID) } return port, nil } func (a *Agent) proxyDataSources() proxycfg.DataSources { sources := proxycfg.DataSources{ CARoots: proxycfgglue.CacheCARoots(a.cache), CompiledDiscoveryChain: proxycfgglue.CacheCompiledDiscoveryChain(a.cache), ConfigEntry: proxycfgglue.CacheConfigEntry(a.cache), ConfigEntryList: proxycfgglue.CacheConfigEntryList(a.cache), Datacenters: proxycfgglue.CacheDatacenters(a.cache), FederationStateListMeshGateways: proxycfgglue.CacheFederationStateListMeshGateways(a.cache), GatewayServices: proxycfgglue.CacheGatewayServices(a.cache), ServiceGateways: proxycfgglue.CacheServiceGateways(a.cache), Health: proxycfgglue.ClientHealth(a.rpcClientHealth), HTTPChecks: proxycfgglue.CacheHTTPChecks(a.cache), Intentions: proxycfgglue.CacheIntentions(a.cache), IntentionUpstreams: proxycfgglue.CacheIntentionUpstreams(a.cache), IntentionUpstreamsDestination: proxycfgglue.CacheIntentionUpstreamsDestination(a.cache), InternalServiceDump: proxycfgglue.CacheInternalServiceDump(a.cache), LeafCertificate: proxycfgglue.LocalLeafCerts(a.leafCertManager), PeeredUpstreams: proxycfgglue.CachePeeredUpstreams(a.cache), PeeringList: proxycfgglue.CachePeeringList(a.cache), PreparedQuery: proxycfgglue.CachePrepraredQuery(a.cache), ResolvedServiceConfig: proxycfgglue.CacheResolvedServiceConfig(a.cache), ServiceList: proxycfgglue.CacheServiceList(a.cache), TrustBundle: proxycfgglue.CacheTrustBundle(a.cache), TrustBundleList: proxycfgglue.CacheTrustBundleList(a.cache), ExportedPeeredServices: proxycfgglue.CacheExportedPeeredServices(a.cache), } if server, ok := a.delegate.(*consul.Server); ok { deps := proxycfgglue.ServerDataSourceDeps{ Datacenter: a.config.Datacenter, EventPublisher: a.baseDeps.EventPublisher, ViewStore: a.baseDeps.ViewStore, Logger: a.logger.Named("proxycfg.server-data-sources"), ACLResolver: a.delegate, GetStore: func() proxycfgglue.Store { return server.FSM().State() }, } sources.ConfigEntry = proxycfgglue.ServerConfigEntry(deps) sources.ConfigEntryList = proxycfgglue.ServerConfigEntryList(deps) sources.CompiledDiscoveryChain = proxycfgglue.ServerCompiledDiscoveryChain(deps, proxycfgglue.CacheCompiledDiscoveryChain(a.cache)) sources.ExportedPeeredServices = proxycfgglue.ServerExportedPeeredServices(deps) sources.FederationStateListMeshGateways = proxycfgglue.ServerFederationStateListMeshGateways(deps) sources.GatewayServices = proxycfgglue.ServerGatewayServices(deps) // We do not use this health check currently due to a bug with the way that service exports // interact with ACLs and the streaming backend. See comments in `proxycfgglue.ServerHealthBlocking` // for more details. // sources.Health = proxycfgglue.ServerHealth(deps, proxycfgglue.ClientHealth(a.rpcClientHealth)) sources.Health = proxycfgglue.ServerHealthBlocking(deps, proxycfgglue.ClientHealth(a.rpcClientHealth), server.FSM().State()) sources.HTTPChecks = proxycfgglue.ServerHTTPChecks(deps, a.config.NodeName, proxycfgglue.CacheHTTPChecks(a.cache), a.State) sources.Intentions = proxycfgglue.ServerIntentions(deps) sources.IntentionUpstreams = proxycfgglue.ServerIntentionUpstreams(deps) sources.IntentionUpstreamsDestination = proxycfgglue.ServerIntentionUpstreamsDestination(deps) sources.InternalServiceDump = proxycfgglue.ServerInternalServiceDump(deps, proxycfgglue.CacheInternalServiceDump(a.cache)) sources.PeeringList = proxycfgglue.ServerPeeringList(deps) sources.PeeredUpstreams = proxycfgglue.ServerPeeredUpstreams(deps) sources.ResolvedServiceConfig = proxycfgglue.ServerResolvedServiceConfig(deps, proxycfgglue.CacheResolvedServiceConfig(a.cache)) sources.ServiceList = proxycfgglue.ServerServiceList(deps, proxycfgglue.CacheServiceList(a.cache)) sources.TrustBundle = proxycfgglue.ServerTrustBundle(deps) sources.TrustBundleList = proxycfgglue.ServerTrustBundleList(deps) } a.fillEnterpriseProxyDataSources(&sources) return sources } // persistServerMetadata periodically writes a server's metadata to a file // in the configured data directory. func (a *Agent) persistServerMetadata() { file := filepath.Join(a.config.DataDir, consul.ServerMetadataFile) // Create a timer with no initial tick to allow metadata to be written immediately. t := time.NewTimer(0) defer t.Stop() for { select { case <-t.C: // Reset the timer to the larger periodic interval. t.Reset(1 * time.Hour) f, err := consul.OpenServerMetadata(file) if err != nil { a.logger.Error("failed to open existing server metadata", "error", err) continue } if err := consul.WriteServerMetadata(f); err != nil { f.Close() a.logger.Error("failed to write server metadata", "error", err) continue } f.Close() case <-a.shutdownCh: return } } } // checkServerLastSeen is a safety check that only occurs once of startup to prevent old servers // with stale data from rejoining an existing cluster. // // It attempts to read a server's metadata file and check the last seen Unix timestamp against a // configurable max age. If the metadata file does not exist, we treat this as an initial startup // and return no error. // // Example: if the server recorded a last seen timestamp of now-7d, and we configure a max age // of 3d, then we should prevent the server from rejoining. func (a *Agent) checkServerLastSeen(readFn consul.ServerMetadataReadFunc) error { filename := filepath.Join(a.config.DataDir, consul.ServerMetadataFile) // Read server metadata file. md, err := readFn(filename) if err != nil { // Return early if it doesn't exist as this likely indicates the server is starting for the first time. if errors.Is(err, os.ErrNotExist) { return nil } return fmt.Errorf("error reading server metadata: %w", err) } maxAge := a.config.ServerRejoinAgeMax if md.IsLastSeenStale(maxAge) { return fmt.Errorf("refusing to rejoin cluster because server has been offline for more than the configured server_rejoin_age_max (%s) - consider wiping your data dir", maxAge) } return nil } func listenerPortKey(svcID structs.ServiceID, checkID structs.CheckID) string { return fmt.Sprintf("%s:%s", svcID, checkID) } // grpcInjectAddr injects an ip and port into an address of the form: ip:port[/service] func grpcInjectAddr(existing string, ip string, port int) string { portRepl := fmt.Sprintf("${1}:%d${3}", port) out := grpcAddrRE.ReplaceAllString(existing, portRepl) addrRepl := fmt.Sprintf("%s${2}${3}", ip) out = grpcAddrRE.ReplaceAllString(out, addrRepl) return out } // httpInjectAddr injects a port then an IP into a URL func httpInjectAddr(url string, ip string, port int) string { portRepl := fmt.Sprintf("${1}${2}:%d${4}${5}", port) out := httpAddrRE.ReplaceAllString(url, portRepl) // Ensure that ipv6 addr is enclosed in brackets (RFC 3986) ip = fixIPv6(ip) addrRepl := fmt.Sprintf("${1}%s${3}${4}${5}", ip) out = httpAddrRE.ReplaceAllString(out, addrRepl) return out } func fixIPv6(address string) string { if strings.Count(address, ":") < 2 { return address } if !strings.HasSuffix(address, "]") { address = address + "]" } if !strings.HasPrefix(address, "[") { address = "[" + address } return address } // defaultIfEmpty returns the value if not empty otherwise the default value. func defaultIfEmpty(val, defaultVal string) string { if val != "" { return val } return defaultVal }