package daemon // import "github.com/docker/docker/daemon" import ( "encoding/json" "fmt" "github.com/docker/docker/daemon/config" "github.com/docker/docker/daemon/discovery" "github.com/sirupsen/logrus" ) // Reload reads configuration changes and modifies the // daemon according to those changes. // These are the settings that Reload changes: // - Platform runtime // - Daemon debug log level // - Daemon max concurrent downloads // - Daemon max concurrent uploads // - Daemon max download attempts // - Daemon shutdown timeout (in seconds) // - Cluster discovery (reconfigure and restart) // - Daemon labels // - Insecure registries // - Registry mirrors // - Daemon live restore func (daemon *Daemon) Reload(conf *config.Config) (err error) { daemon.configStore.Lock() attributes := map[string]string{} defer func() { jsonString, _ := json.Marshal(daemon.configStore) // we're unlocking here, because // LogDaemonEventWithAttributes() -> SystemInfo() -> GetAllRuntimes() // holds that lock too. daemon.configStore.Unlock() if err == nil { logrus.Infof("Reloaded configuration: %s", jsonString) daemon.LogDaemonEventWithAttributes("reload", attributes) } }() if err := daemon.reloadPlatform(conf, attributes); err != nil { return err } daemon.reloadDebug(conf, attributes) daemon.reloadMaxConcurrentDownloadsAndUploads(conf, attributes) if err := daemon.reloadMaxDownloadAttempts(conf, attributes); err != nil { return err } daemon.reloadShutdownTimeout(conf, attributes) daemon.reloadFeatures(conf, attributes) if err := daemon.reloadClusterDiscovery(conf, attributes); err != nil { return err } if err := daemon.reloadLabels(conf, attributes); err != nil { return err } if err := daemon.reloadAllowNondistributableArtifacts(conf, attributes); err != nil { return err } if err := daemon.reloadInsecureRegistries(conf, attributes); err != nil { return err } if err := daemon.reloadRegistryMirrors(conf, attributes); err != nil { return err } if err := daemon.reloadLiveRestore(conf, attributes); err != nil { return err } return daemon.reloadNetworkDiagnosticPort(conf, attributes) } // reloadDebug updates configuration with Debug option // and updates the passed attributes func (daemon *Daemon) reloadDebug(conf *config.Config, attributes map[string]string) { // update corresponding configuration if conf.IsValueSet("debug") { daemon.configStore.Debug = conf.Debug } // prepare reload event attributes with updatable configurations attributes["debug"] = fmt.Sprintf("%t", daemon.configStore.Debug) } // reloadMaxConcurrentDownloadsAndUploads updates configuration with max concurrent // download and upload options and updates the passed attributes func (daemon *Daemon) reloadMaxConcurrentDownloadsAndUploads(conf *config.Config, attributes map[string]string) { // If no value is set for max-concurrent-downloads we assume it is the default value // We always "reset" as the cost is lightweight and easy to maintain. maxConcurrentDownloads := config.DefaultMaxConcurrentDownloads if conf.IsValueSet("max-concurrent-downloads") && conf.MaxConcurrentDownloads != nil { maxConcurrentDownloads = *conf.MaxConcurrentDownloads } daemon.configStore.MaxConcurrentDownloads = &maxConcurrentDownloads logrus.Debugf("Reset Max Concurrent Downloads: %d", *daemon.configStore.MaxConcurrentDownloads) // If no value is set for max-concurrent-upload we assume it is the default value // We always "reset" as the cost is lightweight and easy to maintain. maxConcurrentUploads := config.DefaultMaxConcurrentUploads if conf.IsValueSet("max-concurrent-uploads") && conf.MaxConcurrentUploads != nil { maxConcurrentUploads = *conf.MaxConcurrentUploads } daemon.configStore.MaxConcurrentUploads = &maxConcurrentUploads logrus.Debugf("Reset Max Concurrent Uploads: %d", *daemon.configStore.MaxConcurrentUploads) if daemon.imageService != nil { daemon.imageService.UpdateConfig(&maxConcurrentDownloads, &maxConcurrentUploads) } // prepare reload event attributes with updatable configurations attributes["max-concurrent-downloads"] = fmt.Sprintf("%d", *daemon.configStore.MaxConcurrentDownloads) // prepare reload event attributes with updatable configurations attributes["max-concurrent-uploads"] = fmt.Sprintf("%d", *daemon.configStore.MaxConcurrentUploads) } // reloadMaxDownloadAttempts updates configuration with max concurrent // download attempts when a connection is lost and updates the passed attributes func (daemon *Daemon) reloadMaxDownloadAttempts(conf *config.Config, attributes map[string]string) error { if err := config.ValidateMaxDownloadAttempts(conf); err != nil { return err } // If no value is set for max-download-attempts we assume it is the default value // We always "reset" as the cost is lightweight and easy to maintain. maxDownloadAttempts := config.DefaultDownloadAttempts if conf.IsValueSet("max-download-attempts") && conf.MaxDownloadAttempts != nil { maxDownloadAttempts = *conf.MaxDownloadAttempts } daemon.configStore.MaxDownloadAttempts = &maxDownloadAttempts logrus.Debugf("Reset Max Download Attempts: %d", *daemon.configStore.MaxDownloadAttempts) // prepare reload event attributes with updatable configurations attributes["max-download-attempts"] = fmt.Sprintf("%d", *daemon.configStore.MaxDownloadAttempts) return nil } // reloadShutdownTimeout updates configuration with daemon shutdown timeout option // and updates the passed attributes func (daemon *Daemon) reloadShutdownTimeout(conf *config.Config, attributes map[string]string) { // update corresponding configuration if conf.IsValueSet("shutdown-timeout") { daemon.configStore.ShutdownTimeout = conf.ShutdownTimeout logrus.Debugf("Reset Shutdown Timeout: %d", daemon.configStore.ShutdownTimeout) } // prepare reload event attributes with updatable configurations attributes["shutdown-timeout"] = fmt.Sprintf("%d", daemon.configStore.ShutdownTimeout) } // reloadClusterDiscovery updates configuration with cluster discovery options // and updates the passed attributes func (daemon *Daemon) reloadClusterDiscovery(conf *config.Config, attributes map[string]string) (err error) { defer func() { // prepare reload event attributes with updatable configurations attributes["cluster-store"] = conf.ClusterStore attributes["cluster-advertise"] = conf.ClusterAdvertise attributes["cluster-store-opts"] = "{}" if daemon.configStore.ClusterOpts != nil { opts, err2 := json.Marshal(conf.ClusterOpts) if err != nil { err = err2 } attributes["cluster-store-opts"] = string(opts) } }() newAdvertise := conf.ClusterAdvertise newClusterStore := daemon.configStore.ClusterStore if conf.IsValueSet("cluster-advertise") { if conf.IsValueSet("cluster-store") { newClusterStore = conf.ClusterStore } newAdvertise, err = config.ParseClusterAdvertiseSettings(newClusterStore, conf.ClusterAdvertise) if err != nil && err != discovery.ErrDiscoveryDisabled { return err } } if daemon.clusterProvider != nil { if err := conf.IsSwarmCompatible(); err != nil { return err } } // check discovery modifications if !config.ModifiedDiscoverySettings(daemon.configStore, newClusterStore, newAdvertise, conf.ClusterOpts) { return nil } // enable discovery for the first time if it was not previously enabled if daemon.discoveryWatcher == nil { discoveryWatcher, err := discovery.Init(newClusterStore, newAdvertise, conf.ClusterOpts) if err != nil { return fmt.Errorf("failed to initialize discovery: %v", err) } daemon.discoveryWatcher = discoveryWatcher } else if err == discovery.ErrDiscoveryDisabled { // disable discovery if it was previously enabled and it's disabled now daemon.discoveryWatcher.Stop() } else if err = daemon.discoveryWatcher.Reload(conf.ClusterStore, newAdvertise, conf.ClusterOpts); err != nil { // reload discovery return err } daemon.configStore.ClusterStore = newClusterStore daemon.configStore.ClusterOpts = conf.ClusterOpts daemon.configStore.ClusterAdvertise = newAdvertise if daemon.netController == nil { return nil } netOptions, err := daemon.networkOptions(daemon.configStore, daemon.PluginStore, nil) if err != nil { logrus.WithError(err).Warn("failed to get options with network controller") return nil } err = daemon.netController.ReloadConfiguration(netOptions...) if err != nil { logrus.Warnf("Failed to reload configuration with network controller: %v", err) } return nil } // reloadLabels updates configuration with engine labels // and updates the passed attributes func (daemon *Daemon) reloadLabels(conf *config.Config, attributes map[string]string) error { // update corresponding configuration if conf.IsValueSet("labels") { daemon.configStore.Labels = conf.Labels } // prepare reload event attributes with updatable configurations if daemon.configStore.Labels != nil { labels, err := json.Marshal(daemon.configStore.Labels) if err != nil { return err } attributes["labels"] = string(labels) } else { attributes["labels"] = "[]" } return nil } // reloadAllowNondistributableArtifacts updates the configuration with allow-nondistributable-artifacts options // and updates the passed attributes. func (daemon *Daemon) reloadAllowNondistributableArtifacts(conf *config.Config, attributes map[string]string) error { // Update corresponding configuration. if conf.IsValueSet("allow-nondistributable-artifacts") { daemon.configStore.AllowNondistributableArtifacts = conf.AllowNondistributableArtifacts if err := daemon.RegistryService.LoadAllowNondistributableArtifacts(conf.AllowNondistributableArtifacts); err != nil { return err } } // Prepare reload event attributes with updatable configurations. if daemon.configStore.AllowNondistributableArtifacts != nil { v, err := json.Marshal(daemon.configStore.AllowNondistributableArtifacts) if err != nil { return err } attributes["allow-nondistributable-artifacts"] = string(v) } else { attributes["allow-nondistributable-artifacts"] = "[]" } return nil } // reloadInsecureRegistries updates configuration with insecure registry option // and updates the passed attributes func (daemon *Daemon) reloadInsecureRegistries(conf *config.Config, attributes map[string]string) error { // update corresponding configuration if conf.IsValueSet("insecure-registries") { daemon.configStore.InsecureRegistries = conf.InsecureRegistries if err := daemon.RegistryService.LoadInsecureRegistries(conf.InsecureRegistries); err != nil { return err } } // prepare reload event attributes with updatable configurations if daemon.configStore.InsecureRegistries != nil { insecureRegistries, err := json.Marshal(daemon.configStore.InsecureRegistries) if err != nil { return err } attributes["insecure-registries"] = string(insecureRegistries) } else { attributes["insecure-registries"] = "[]" } return nil } // reloadRegistryMirrors updates configuration with registry mirror options // and updates the passed attributes func (daemon *Daemon) reloadRegistryMirrors(conf *config.Config, attributes map[string]string) error { // update corresponding configuration if conf.IsValueSet("registry-mirrors") { daemon.configStore.Mirrors = conf.Mirrors if err := daemon.RegistryService.LoadMirrors(conf.Mirrors); err != nil { return err } } // prepare reload event attributes with updatable configurations if daemon.configStore.Mirrors != nil { mirrors, err := json.Marshal(daemon.configStore.Mirrors) if err != nil { return err } attributes["registry-mirrors"] = string(mirrors) } else { attributes["registry-mirrors"] = "[]" } return nil } // reloadLiveRestore updates configuration with live restore option // and updates the passed attributes func (daemon *Daemon) reloadLiveRestore(conf *config.Config, attributes map[string]string) error { // update corresponding configuration if conf.IsValueSet("live-restore") { daemon.configStore.LiveRestoreEnabled = conf.LiveRestoreEnabled } // prepare reload event attributes with updatable configurations attributes["live-restore"] = fmt.Sprintf("%t", daemon.configStore.LiveRestoreEnabled) return nil } // reloadNetworkDiagnosticPort updates the network controller starting the diagnostic if the config is valid func (daemon *Daemon) reloadNetworkDiagnosticPort(conf *config.Config, attributes map[string]string) error { if conf == nil || daemon.netController == nil || !conf.IsValueSet("network-diagnostic-port") || conf.NetworkDiagnosticPort < 1 || conf.NetworkDiagnosticPort > 65535 { // If there is no config make sure that the diagnostic is off if daemon.netController != nil { daemon.netController.StopDiagnostic() } return nil } // Enable the network diagnostic if the flag is set with a valid port within the range logrus.WithFields(logrus.Fields{"port": conf.NetworkDiagnosticPort, "ip": "127.0.0.1"}).Warn("Starting network diagnostic server") daemon.netController.StartDiagnostic(conf.NetworkDiagnosticPort) return nil } // reloadFeatures updates configuration with enabled/disabled features func (daemon *Daemon) reloadFeatures(conf *config.Config, attributes map[string]string) { // update corresponding configuration // note that we allow features option to be entirely unset daemon.configStore.Features = conf.Features // prepare reload event attributes with updatable configurations attributes["features"] = fmt.Sprintf("%v", daemon.configStore.Features) }