package main import ( "context" "crypto/tls" "fmt" "os" "path/filepath" "runtime" "strings" "time" containerddefaults "github.com/containerd/containerd/defaults" "github.com/docker/distribution/uuid" "github.com/docker/docker/api" apiserver "github.com/docker/docker/api/server" buildbackend "github.com/docker/docker/api/server/backend/build" "github.com/docker/docker/api/server/middleware" "github.com/docker/docker/api/server/router" "github.com/docker/docker/api/server/router/build" checkpointrouter "github.com/docker/docker/api/server/router/checkpoint" "github.com/docker/docker/api/server/router/container" distributionrouter "github.com/docker/docker/api/server/router/distribution" grpcrouter "github.com/docker/docker/api/server/router/grpc" "github.com/docker/docker/api/server/router/image" "github.com/docker/docker/api/server/router/network" pluginrouter "github.com/docker/docker/api/server/router/plugin" sessionrouter "github.com/docker/docker/api/server/router/session" swarmrouter "github.com/docker/docker/api/server/router/swarm" systemrouter "github.com/docker/docker/api/server/router/system" "github.com/docker/docker/api/server/router/volume" buildkit "github.com/docker/docker/builder/builder-next" "github.com/docker/docker/builder/dockerfile" "github.com/docker/docker/cli/debug" "github.com/docker/docker/daemon" "github.com/docker/docker/daemon/cluster" "github.com/docker/docker/daemon/config" "github.com/docker/docker/daemon/listeners" "github.com/docker/docker/dockerversion" "github.com/docker/docker/libcontainerd/supervisor" dopts "github.com/docker/docker/opts" "github.com/docker/docker/pkg/authorization" "github.com/docker/docker/pkg/homedir" "github.com/docker/docker/pkg/jsonmessage" "github.com/docker/docker/pkg/pidfile" "github.com/docker/docker/pkg/plugingetter" "github.com/docker/docker/pkg/signal" "github.com/docker/docker/pkg/system" "github.com/docker/docker/plugin" "github.com/docker/docker/rootless" "github.com/docker/docker/runconfig" "github.com/docker/go-connections/tlsconfig" swarmapi "github.com/docker/swarmkit/api" "github.com/moby/buildkit/session" "github.com/pkg/errors" "github.com/sirupsen/logrus" "github.com/spf13/pflag" ) // DaemonCli represents the daemon CLI. type DaemonCli struct { *config.Config configFile *string flags *pflag.FlagSet api *apiserver.Server d *daemon.Daemon authzMiddleware *authorization.Middleware // authzMiddleware enables to dynamically reload the authorization plugins } // NewDaemonCli returns a daemon CLI func NewDaemonCli() *DaemonCli { return &DaemonCli{} } func (cli *DaemonCli) start(opts *daemonOptions) (err error) { stopc := make(chan bool) defer close(stopc) // warn from uuid package when running the daemon uuid.Loggerf = logrus.Warnf opts.SetDefaultOptions(opts.flags) if cli.Config, err = loadDaemonCliConfig(opts); err != nil { return err } if err := configureDaemonLogs(cli.Config); err != nil { return err } logrus.Info("Starting up") cli.configFile = &opts.configFile cli.flags = opts.flags if cli.Config.Debug { debug.Enable() } if cli.Config.Experimental { logrus.Warn("Running experimental build") if cli.Config.IsRootless() { logrus.Warn("Running in rootless mode. Cgroups, AppArmor, and CRIU are disabled.") } if rootless.RunningWithRootlessKit() { logrus.Info("Running with RootlessKit integration") if !cli.Config.IsRootless() { return fmt.Errorf("rootless mode needs to be enabled for running with RootlessKit") } } } else { if cli.Config.IsRootless() { return fmt.Errorf("rootless mode is supported only when running in experimental mode") } } // return human-friendly error before creating files if runtime.GOOS == "linux" && os.Geteuid() != 0 { return fmt.Errorf("dockerd needs to be started with root. To see how to run dockerd in rootless mode with unprivileged user, see the documentation") } system.InitLCOW(cli.Config.Experimental) if err := setDefaultUmask(); err != nil { return err } // Create the daemon root before we create ANY other files (PID, or migrate keys) // to ensure the appropriate ACL is set (particularly relevant on Windows) if err := daemon.CreateDaemonRoot(cli.Config); err != nil { return err } if err := system.MkdirAll(cli.Config.ExecRoot, 0700); err != nil { return err } potentiallyUnderRuntimeDir := []string{cli.Config.ExecRoot} if cli.Pidfile != "" { pf, err := pidfile.New(cli.Pidfile) if err != nil { return errors.Wrap(err, "failed to start daemon") } potentiallyUnderRuntimeDir = append(potentiallyUnderRuntimeDir, cli.Pidfile) defer func() { if err := pf.Remove(); err != nil { logrus.Error(err) } }() } if cli.Config.IsRootless() { // Set sticky bit if XDG_RUNTIME_DIR is set && the file is actually under XDG_RUNTIME_DIR if _, err := homedir.StickRuntimeDirContents(potentiallyUnderRuntimeDir); err != nil { // StickRuntimeDirContents returns nil error if XDG_RUNTIME_DIR is just unset logrus.WithError(err).Warn("cannot set sticky bit on files under XDG_RUNTIME_DIR") } } serverConfig, err := newAPIServerConfig(cli) if err != nil { return errors.Wrap(err, "failed to create API server") } cli.api = apiserver.New(serverConfig) hosts, err := loadListeners(cli, serverConfig) if err != nil { return errors.Wrap(err, "failed to load listeners") } ctx, cancel := context.WithCancel(context.Background()) waitForContainerDShutdown, err := cli.initContainerD(ctx) if waitForContainerDShutdown != nil { defer waitForContainerDShutdown(10 * time.Second) } if err != nil { cancel() return err } defer cancel() signal.Trap(func() { cli.stop() <-stopc // wait for daemonCli.start() to return }, logrus.StandardLogger()) // Notify that the API is active, but before daemon is set up. preNotifySystem() pluginStore := plugin.NewStore() if err := cli.initMiddlewares(cli.api, serverConfig, pluginStore); err != nil { logrus.Fatalf("Error creating middlewares: %v", err) } d, err := daemon.NewDaemon(ctx, cli.Config, pluginStore) if err != nil { return errors.Wrap(err, "failed to start daemon") } d.StoreHosts(hosts) // validate after NewDaemon has restored enabled plugins. Don't change order. if err := validateAuthzPlugins(cli.Config.AuthorizationPlugins, pluginStore); err != nil { return errors.Wrap(err, "failed to validate authorization plugin") } cli.d = d if err := cli.startMetricsServer(cli.Config.MetricsAddress); err != nil { return err } c, err := createAndStartCluster(cli, d) if err != nil { logrus.Fatalf("Error starting cluster component: %v", err) } // Restart all autostart containers which has a swarm endpoint // and is not yet running now that we have successfully // initialized the cluster. d.RestartSwarmContainers() logrus.Info("Daemon has completed initialization") routerOptions, err := newRouterOptions(cli.Config, d) if err != nil { return err } routerOptions.api = cli.api routerOptions.cluster = c initRouter(routerOptions) go d.ProcessClusterNotifications(ctx, c.GetWatchStream()) cli.setupConfigReloadTrap() // The serve API routine never exits unless an error occurs // We need to start it as a goroutine and wait on it so // daemon doesn't exit serveAPIWait := make(chan error) go cli.api.Wait(serveAPIWait) // after the daemon is done setting up we can notify systemd api notifySystem() // Daemon is fully initialized and handling API traffic // Wait for serve API to complete errAPI := <-serveAPIWait c.Cleanup() shutdownDaemon(d) // Stop notification processing and any background processes cancel() if errAPI != nil { return errors.Wrap(errAPI, "shutting down due to ServeAPI error") } logrus.Info("Daemon shutdown complete") return nil } type routerOptions struct { sessionManager *session.Manager buildBackend *buildbackend.Backend features *map[string]bool buildkit *buildkit.Builder daemon *daemon.Daemon api *apiserver.Server cluster *cluster.Cluster } func newRouterOptions(config *config.Config, d *daemon.Daemon) (routerOptions, error) { opts := routerOptions{} sm, err := session.NewManager() if err != nil { return opts, errors.Wrap(err, "failed to create sessionmanager") } manager, err := dockerfile.NewBuildManager(d.BuilderBackend(), d.IdentityMapping()) if err != nil { return opts, err } cgroupParent := newCgroupParent(config) bk, err := buildkit.New(buildkit.Opt{ SessionManager: sm, Root: filepath.Join(config.Root, "buildkit"), Dist: d.DistributionServices(), NetworkController: d.NetworkController(), DefaultCgroupParent: cgroupParent, ResolverOpt: d.NewResolveOptionsFunc(), BuilderConfig: config.Builder, Rootless: d.Rootless(), IdentityMapping: d.IdentityMapping(), DNSConfig: config.DNSConfig, }) if err != nil { return opts, err } bb, err := buildbackend.NewBackend(d.ImageService(), manager, bk) if err != nil { return opts, errors.Wrap(err, "failed to create buildmanager") } return routerOptions{ sessionManager: sm, buildBackend: bb, buildkit: bk, features: d.Features(), daemon: d, }, nil } func (cli *DaemonCli) reloadConfig() { reload := func(c *config.Config) { // Revalidate and reload the authorization plugins if err := validateAuthzPlugins(c.AuthorizationPlugins, cli.d.PluginStore); err != nil { logrus.Fatalf("Error validating authorization plugin: %v", err) return } cli.authzMiddleware.SetPlugins(c.AuthorizationPlugins) // The namespaces com.docker.*, io.docker.*, org.dockerproject.* have been documented // to be reserved for Docker's internal use, but this was never enforced. Allowing // configured labels to use these namespaces are deprecated for 18.05. // // The following will check the usage of such labels, and report a warning for deprecation. // // TODO: At the next stable release, the validation should be folded into the other // configuration validation functions and an error will be returned instead, and this // block should be deleted. if err := config.ValidateReservedNamespaceLabels(c.Labels); err != nil { logrus.Warnf("Configured labels using reserved namespaces is deprecated: %s", err) } if err := cli.d.Reload(c); err != nil { logrus.Errorf("Error reconfiguring the daemon: %v", err) return } if c.IsValueSet("debug") { debugEnabled := debug.IsEnabled() switch { case debugEnabled && !c.Debug: // disable debug debug.Disable() case c.Debug && !debugEnabled: // enable debug debug.Enable() } } } if err := config.Reload(*cli.configFile, cli.flags, reload); err != nil { logrus.Error(err) } } func (cli *DaemonCli) stop() { cli.api.Close() } // shutdownDaemon just wraps daemon.Shutdown() to handle a timeout in case // d.Shutdown() is waiting too long to kill container or worst it's // blocked there func shutdownDaemon(d *daemon.Daemon) { shutdownTimeout := d.ShutdownTimeout() ch := make(chan struct{}) go func() { d.Shutdown() close(ch) }() if shutdownTimeout < 0 { <-ch logrus.Debug("Clean shutdown succeeded") return } timeout := time.NewTimer(time.Duration(shutdownTimeout) * time.Second) defer timeout.Stop() select { case <-ch: logrus.Debug("Clean shutdown succeeded") case <-timeout.C: logrus.Error("Force shutdown daemon") } } func loadDaemonCliConfig(opts *daemonOptions) (*config.Config, error) { conf := opts.daemonConfig flags := opts.flags conf.Debug = opts.Debug conf.Hosts = opts.Hosts conf.LogLevel = opts.LogLevel conf.TLS = opts.TLS conf.TLSVerify = opts.TLSVerify conf.CommonTLSOptions = config.CommonTLSOptions{} if opts.TLSOptions != nil { conf.CommonTLSOptions.CAFile = opts.TLSOptions.CAFile conf.CommonTLSOptions.CertFile = opts.TLSOptions.CertFile conf.CommonTLSOptions.KeyFile = opts.TLSOptions.KeyFile } if conf.TrustKeyPath == "" { daemonConfDir, err := getDaemonConfDir(conf.Root) if err != nil { return nil, err } conf.TrustKeyPath = filepath.Join(daemonConfDir, defaultTrustKeyFile) } if flags.Changed("graph") && flags.Changed("data-root") { return nil, errors.New(`cannot specify both "--graph" and "--data-root" option`) } if opts.configFile != "" { c, err := config.MergeDaemonConfigurations(conf, flags, opts.configFile) if err != nil { if flags.Changed("config-file") || !os.IsNotExist(err) { return nil, errors.Wrapf(err, "unable to configure the Docker daemon with file %s", opts.configFile) } } // the merged configuration can be nil if the config file didn't exist. // leave the current configuration as it is if when that happens. if c != nil { conf = c } } if err := config.Validate(conf); err != nil { return nil, err } if flags.Changed("graph") { logrus.Warnf(`The "-g / --graph" flag is deprecated. Please use "--data-root" instead`) } // Check if duplicate label-keys with different values are found newLabels, err := config.GetConflictFreeLabels(conf.Labels) if err != nil { return nil, err } // The namespaces com.docker.*, io.docker.*, org.dockerproject.* have been documented // to be reserved for Docker's internal use, but this was never enforced. Allowing // configured labels to use these namespaces are deprecated for 18.05. // // The following will check the usage of such labels, and report a warning for deprecation. // // TODO: At the next stable release, the validation should be folded into the other // configuration validation functions and an error will be returned instead, and this // block should be deleted. if err := config.ValidateReservedNamespaceLabels(newLabels); err != nil { logrus.Warnf("Configured labels using reserved namespaces is deprecated: %s", err) } conf.Labels = newLabels // Regardless of whether the user sets it to true or false, if they // specify TLSVerify at all then we need to turn on TLS if conf.IsValueSet(FlagTLSVerify) { conf.TLS = true } return conf, nil } func initRouter(opts routerOptions) { decoder := runconfig.ContainerDecoder{} routers := []router.Router{ // we need to add the checkpoint router before the container router or the DELETE gets masked checkpointrouter.NewRouter(opts.daemon, decoder), container.NewRouter(opts.daemon, decoder), image.NewRouter(opts.daemon.ImageService()), systemrouter.NewRouter(opts.daemon, opts.cluster, opts.buildkit, opts.features), volume.NewRouter(opts.daemon.VolumesService()), build.NewRouter(opts.buildBackend, opts.daemon, opts.features), sessionrouter.NewRouter(opts.sessionManager), swarmrouter.NewRouter(opts.cluster), pluginrouter.NewRouter(opts.daemon.PluginManager()), distributionrouter.NewRouter(opts.daemon.ImageService()), } grpcBackends := []grpcrouter.Backend{} for _, b := range []interface{}{opts.daemon, opts.buildBackend} { if b, ok := b.(grpcrouter.Backend); ok { grpcBackends = append(grpcBackends, b) } } if len(grpcBackends) > 0 { routers = append(routers, grpcrouter.NewRouter(grpcBackends...)) } if opts.daemon.NetworkControllerEnabled() { routers = append(routers, network.NewRouter(opts.daemon, opts.cluster)) } if opts.daemon.HasExperimental() { for _, r := range routers { for _, route := range r.Routes() { if experimental, ok := route.(router.ExperimentalRoute); ok { experimental.Enable() } } } } opts.api.InitRouter(routers...) } // TODO: remove this from cli and return the authzMiddleware func (cli *DaemonCli) initMiddlewares(s *apiserver.Server, cfg *apiserver.Config, pluginStore plugingetter.PluginGetter) error { v := cfg.Version exp := middleware.NewExperimentalMiddleware(cli.Config.Experimental) s.UseMiddleware(exp) vm := middleware.NewVersionMiddleware(v, api.DefaultVersion, api.MinVersion) s.UseMiddleware(vm) if cfg.CorsHeaders != "" { c := middleware.NewCORSMiddleware(cfg.CorsHeaders) s.UseMiddleware(c) } cli.authzMiddleware = authorization.NewMiddleware(cli.Config.AuthorizationPlugins, pluginStore) cli.Config.AuthzMiddleware = cli.authzMiddleware s.UseMiddleware(cli.authzMiddleware) return nil } func (cli *DaemonCli) getContainerdDaemonOpts() ([]supervisor.DaemonOpt, error) { opts, err := cli.getPlatformContainerdDaemonOpts() if err != nil { return nil, err } if cli.Config.Debug { opts = append(opts, supervisor.WithLogLevel("debug")) } else if cli.Config.LogLevel != "" { opts = append(opts, supervisor.WithLogLevel(cli.Config.LogLevel)) } if !cli.Config.CriContainerd { opts = append(opts, supervisor.WithPlugin("cri", nil)) } return opts, nil } func newAPIServerConfig(cli *DaemonCli) (*apiserver.Config, error) { serverConfig := &apiserver.Config{ Logging: true, SocketGroup: cli.Config.SocketGroup, Version: dockerversion.Version, CorsHeaders: cli.Config.CorsHeaders, } if cli.Config.TLS { tlsOptions := tlsconfig.Options{ CAFile: cli.Config.CommonTLSOptions.CAFile, CertFile: cli.Config.CommonTLSOptions.CertFile, KeyFile: cli.Config.CommonTLSOptions.KeyFile, ExclusiveRootPools: true, } if cli.Config.TLSVerify { // server requires and verifies client's certificate tlsOptions.ClientAuth = tls.RequireAndVerifyClientCert } tlsConfig, err := tlsconfig.Server(tlsOptions) if err != nil { return nil, err } serverConfig.TLSConfig = tlsConfig } if len(cli.Config.Hosts) == 0 { cli.Config.Hosts = make([]string, 1) } return serverConfig, nil } func loadListeners(cli *DaemonCli, serverConfig *apiserver.Config) ([]string, error) { var hosts []string seen := make(map[string]struct{}, len(cli.Config.Hosts)) for i := 0; i < len(cli.Config.Hosts); i++ { var err error if cli.Config.Hosts[i], err = dopts.ParseHost(cli.Config.TLS, honorXDG, cli.Config.Hosts[i]); err != nil { return nil, errors.Wrapf(err, "error parsing -H %s", cli.Config.Hosts[i]) } if _, ok := seen[cli.Config.Hosts[i]]; ok { continue } seen[cli.Config.Hosts[i]] = struct{}{} protoAddr := cli.Config.Hosts[i] protoAddrParts := strings.SplitN(protoAddr, "://", 2) if len(protoAddrParts) != 2 { return nil, fmt.Errorf("bad format %s, expected PROTO://ADDR", protoAddr) } proto := protoAddrParts[0] addr := protoAddrParts[1] // It's a bad idea to bind to TCP without tlsverify. if proto == "tcp" && (serverConfig.TLSConfig == nil || serverConfig.TLSConfig.ClientAuth != tls.RequireAndVerifyClientCert) { logrus.Warn("[!] DON'T BIND ON ANY IP ADDRESS WITHOUT setting --tlsverify IF YOU DON'T KNOW WHAT YOU'RE DOING [!]") } ls, err := listeners.Init(proto, addr, serverConfig.SocketGroup, serverConfig.TLSConfig) if err != nil { return nil, err } // If we're binding to a TCP port, make sure that a container doesn't try to use it. if proto == "tcp" { if err := allocateDaemonPort(addr); err != nil { return nil, err } } logrus.Debugf("Listener created for HTTP on %s (%s)", proto, addr) hosts = append(hosts, protoAddrParts[1]) cli.api.Accept(addr, ls...) } return hosts, nil } func createAndStartCluster(cli *DaemonCli, d *daemon.Daemon) (*cluster.Cluster, error) { name, _ := os.Hostname() // Use a buffered channel to pass changes from store watch API to daemon // A buffer allows store watch API and daemon processing to not wait for each other watchStream := make(chan *swarmapi.WatchMessage, 32) c, err := cluster.New(cluster.Config{ Root: cli.Config.Root, Name: name, Backend: d, VolumeBackend: d.VolumesService(), ImageBackend: d.ImageService(), PluginBackend: d.PluginManager(), NetworkSubnetsProvider: d, DefaultAdvertiseAddr: cli.Config.SwarmDefaultAdvertiseAddr, RaftHeartbeatTick: cli.Config.SwarmRaftHeartbeatTick, RaftElectionTick: cli.Config.SwarmRaftElectionTick, RuntimeRoot: cli.getSwarmRunRoot(), WatchStream: watchStream, }) if err != nil { return nil, err } d.SetCluster(c) err = c.Start() return c, err } // validates that the plugins requested with the --authorization-plugin flag are valid AuthzDriver // plugins present on the host and available to the daemon func validateAuthzPlugins(requestedPlugins []string, pg plugingetter.PluginGetter) error { for _, reqPlugin := range requestedPlugins { if _, err := pg.Get(reqPlugin, authorization.AuthZApiImplements, plugingetter.Lookup); err != nil { return err } } return nil } func systemContainerdRunning(honorXDG bool) (string, bool, error) { addr := containerddefaults.DefaultAddress if honorXDG { runtimeDir, err := homedir.GetRuntimeDir() if err != nil { return "", false, err } addr = filepath.Join(runtimeDir, "containerd", "containerd.sock") } _, err := os.Lstat(addr) return addr, err == nil, nil } // configureDaemonLogs sets the logrus logging level and formatting func configureDaemonLogs(conf *config.Config) error { if conf.LogLevel != "" { lvl, err := logrus.ParseLevel(conf.LogLevel) if err != nil { return fmt.Errorf("unable to parse logging level: %s", conf.LogLevel) } logrus.SetLevel(lvl) } else { logrus.SetLevel(logrus.InfoLevel) } logrus.SetFormatter(&logrus.TextFormatter{ TimestampFormat: jsonmessage.RFC3339NanoFixed, DisableColors: conf.RawLogs, FullTimestamp: true, }) return nil }