package daemon import ( "fmt" "io" "io/ioutil" "log" "os" "path" "regexp" "runtime" "strings" "sync" "time" "github.com/docker/docker/archive" "github.com/docker/docker/daemon/execdriver" "github.com/docker/docker/daemon/execdriver/execdrivers" "github.com/docker/docker/daemon/execdriver/lxc" "github.com/docker/docker/daemon/graphdriver" _ "github.com/docker/docker/daemon/graphdriver/vfs" _ "github.com/docker/docker/daemon/networkdriver/bridge" "github.com/docker/docker/daemon/networkdriver/portallocator" "github.com/docker/docker/daemonconfig" "github.com/docker/docker/dockerversion" "github.com/docker/docker/engine" "github.com/docker/docker/graph" "github.com/docker/docker/image" "github.com/docker/docker/pkg/broadcastwriter" "github.com/docker/docker/pkg/graphdb" "github.com/docker/docker/pkg/namesgenerator" "github.com/docker/docker/pkg/networkfs/resolvconf" "github.com/docker/docker/pkg/parsers" "github.com/docker/docker/pkg/parsers/kernel" "github.com/docker/docker/pkg/sysinfo" "github.com/docker/docker/pkg/truncindex" "github.com/docker/docker/runconfig" "github.com/docker/docker/utils" "github.com/docker/libcontainer/label" ) // Set the max depth to the aufs default that most // kernels are compiled with // For more information see: http://sourceforge.net/p/aufs/aufs3-standalone/ci/aufs3.12/tree/config.mk const MaxImageDepth = 127 var ( DefaultDns = []string{"8.8.8.8", "8.8.4.4"} validContainerNameChars = `[a-zA-Z0-9_.-]` validContainerNamePattern = regexp.MustCompile(`^/?` + validContainerNameChars + `+$`) ) type contStore struct { s map[string]*Container sync.Mutex } func (c *contStore) Add(id string, cont *Container) { c.Lock() c.s[id] = cont c.Unlock() } func (c *contStore) Get(id string) *Container { c.Lock() res := c.s[id] c.Unlock() return res } func (c *contStore) Delete(id string) { c.Lock() delete(c.s, id) c.Unlock() } func (c *contStore) List() []*Container { containers := new(History) c.Lock() for _, cont := range c.s { containers.Add(cont) } c.Unlock() containers.Sort() return *containers } type Daemon struct { repository string sysInitPath string containers *contStore graph *graph.Graph repositories *graph.TagStore idIndex *truncindex.TruncIndex sysInfo *sysinfo.SysInfo volumes *graph.Graph eng *engine.Engine config *daemonconfig.Config containerGraph *graphdb.Database driver graphdriver.Driver execDriver execdriver.Driver Sockets []string } // Install installs daemon capabilities to eng. func (daemon *Daemon) Install(eng *engine.Engine) error { // FIXME: rename "delete" to "rm" for consistency with the CLI command // FIXME: rename ContainerDestroy to ContainerRm for consistency with the CLI command // FIXME: remove ImageDelete's dependency on Daemon, then move to graph/ for name, method := range map[string]engine.Handler{ "attach": daemon.ContainerAttach, "build": daemon.CmdBuild, "commit": daemon.ContainerCommit, "container_changes": daemon.ContainerChanges, "container_copy": daemon.ContainerCopy, "container_inspect": daemon.ContainerInspect, "containers": daemon.Containers, "create": daemon.ContainerCreate, "delete": daemon.ContainerDestroy, "export": daemon.ContainerExport, "info": daemon.CmdInfo, "kill": daemon.ContainerKill, "logs": daemon.ContainerLogs, "pause": daemon.ContainerPause, "resize": daemon.ContainerResize, "restart": daemon.ContainerRestart, "start": daemon.ContainerStart, "stop": daemon.ContainerStop, "top": daemon.ContainerTop, "unpause": daemon.ContainerUnpause, "wait": daemon.ContainerWait, "image_delete": daemon.ImageDelete, // FIXME: see above } { if err := eng.Register(name, method); err != nil { return err } } return nil } // Get looks for a container by the specified ID or name, and returns it. // If the container is not found, or if an error occurs, nil is returned. func (daemon *Daemon) Get(name string) *Container { if id, err := daemon.idIndex.Get(name); err == nil { return daemon.containers.Get(id) } if c, _ := daemon.GetByName(name); c != nil { return c } return nil } // Exists returns a true if a container of the specified ID or name exists, // false otherwise. func (daemon *Daemon) Exists(id string) bool { return daemon.Get(id) != nil } func (daemon *Daemon) containerRoot(id string) string { return path.Join(daemon.repository, id) } // Load reads the contents of a container from disk // This is typically done at startup. func (daemon *Daemon) load(id string) (*Container, error) { container := &Container{root: daemon.containerRoot(id), State: NewState()} if err := container.FromDisk(); err != nil { return nil, err } if container.ID != id { return container, fmt.Errorf("Container %s is stored at %s", container.ID, id) } return container, nil } // Register makes a container object usable by the daemon as // This is a wrapper for register func (daemon *Daemon) Register(container *Container) error { return daemon.register(container, true, nil) } // register makes a container object usable by the daemon as func (daemon *Daemon) register(container *Container, updateSuffixarray bool, containersToStart *[]*Container) error { if container.daemon != nil || daemon.Exists(container.ID) { return fmt.Errorf("Container is already loaded") } if err := validateID(container.ID); err != nil { return err } if err := daemon.ensureName(container); err != nil { return err } container.daemon = daemon // Attach to stdout and stderr container.stderr = broadcastwriter.New() container.stdout = broadcastwriter.New() // Attach to stdin if container.Config.OpenStdin { container.stdin, container.stdinPipe = io.Pipe() } else { container.stdinPipe = utils.NopWriteCloser(ioutil.Discard) // Silently drop stdin } // done daemon.containers.Add(container.ID, container) // don't update the Suffixarray if we're starting up // we'll waste time if we update it for every container daemon.idIndex.Add(container.ID) // FIXME: if the container is supposed to be running but is not, auto restart it? // if so, then we need to restart monitor and init a new lock // If the container is supposed to be running, make sure of it if container.State.IsRunning() { utils.Debugf("killing old running container %s", container.ID) existingPid := container.State.Pid container.State.SetStopped(0) // We only have to handle this for lxc because the other drivers will ensure that // no processes are left when docker dies if container.ExecDriver == "" || strings.Contains(container.ExecDriver, "lxc") { lxc.KillLxc(container.ID, 9) } else { // use the current driver and ensure that the container is dead x.x cmd := &execdriver.Command{ ID: container.ID, } var err error cmd.Process, err = os.FindProcess(existingPid) if err != nil { utils.Debugf("cannot find existing process for %d", existingPid) } daemon.execDriver.Terminate(cmd) } if err := container.Unmount(); err != nil { utils.Debugf("unmount error %s", err) } if err := container.ToDisk(); err != nil { utils.Debugf("saving stopped state to disk %s", err) } info := daemon.execDriver.Info(container.ID) if !info.IsRunning() { utils.Debugf("Container %s was supposed to be running but is not.", container.ID) utils.Debugf("Marking as stopped") container.State.SetStopped(-127) if err := container.ToDisk(); err != nil { return err } if daemon.config.AutoRestart { utils.Debugf("Marking as restarting") if containersToStart != nil { *containersToStart = append(*containersToStart, container) } } } } return nil } func (daemon *Daemon) ensureName(container *Container) error { if container.Name == "" { name, err := daemon.generateNewName(container.ID) if err != nil { return err } container.Name = name if err := container.ToDisk(); err != nil { utils.Debugf("Error saving container name %s", err) } } return nil } func (daemon *Daemon) LogToDisk(src *broadcastwriter.BroadcastWriter, dst, stream string) error { log, err := os.OpenFile(dst, os.O_RDWR|os.O_APPEND|os.O_CREATE, 0600) if err != nil { return err } src.AddWriter(log, stream) return nil } func (daemon *Daemon) restore() error { var ( debug = (os.Getenv("DEBUG") != "" || os.Getenv("TEST") != "") containers = make(map[string]*Container) currentDriver = daemon.driver.String() containersToStart = []*Container{} ) if !debug { fmt.Printf("Loading containers: ") } dir, err := ioutil.ReadDir(daemon.repository) if err != nil { return err } for _, v := range dir { id := v.Name() container, err := daemon.load(id) if !debug { fmt.Print(".") } if err != nil { utils.Errorf("Failed to load container %v: %v", id, err) continue } // Ignore the container if it does not support the current driver being used by the graph if container.Driver == "" && currentDriver == "aufs" || container.Driver == currentDriver { utils.Debugf("Loaded container %v", container.ID) containers[container.ID] = container } else { utils.Debugf("Cannot load container %s because it was created with another graph driver.", container.ID) } } if entities := daemon.containerGraph.List("/", -1); entities != nil { for _, p := range entities.Paths() { if !debug { fmt.Print(".") } e := entities[p] if container, ok := containers[e.ID()]; ok { if err := daemon.register(container, false, &containersToStart); err != nil { utils.Debugf("Failed to register container %s: %s", container.ID, err) } delete(containers, e.ID()) } } } // Any containers that are left over do not exist in the graph for _, container := range containers { // Try to set the default name for a container if it exists prior to links container.Name, err = daemon.generateNewName(container.ID) if err != nil { utils.Debugf("Setting default id - %s", err) } if err := daemon.register(container, false, &containersToStart); err != nil { utils.Debugf("Failed to register container %s: %s", container.ID, err) } } for _, container := range containersToStart { utils.Debugf("Starting container %d", container.ID) if err := container.Start(); err != nil { utils.Debugf("Failed to start container %s: %s", container.ID, err) } } if !debug { fmt.Printf(": done.\n") } return nil } func (daemon *Daemon) checkImageDepth(img *image.Image) error { // We add 2 layers to the depth because the container's rw and // init layer add to the restriction depth, err := img.Depth() if err != nil { return err } if depth+2 >= MaxImageDepth { return fmt.Errorf("Cannot create container with more than %d parents", MaxImageDepth) } return nil } func (daemon *Daemon) checkDeprecatedExpose(config *runconfig.Config) bool { if config != nil { if config.PortSpecs != nil { for _, p := range config.PortSpecs { if strings.Contains(p, ":") { return true } } } } return false } func (daemon *Daemon) mergeAndVerifyConfig(config *runconfig.Config, img *image.Image) ([]string, error) { warnings := []string{} if daemon.checkDeprecatedExpose(img.Config) || daemon.checkDeprecatedExpose(config) { warnings = append(warnings, "The mapping to public ports on your host via Dockerfile EXPOSE (host:port:port) has been deprecated. Use -p to publish the ports.") } if img.Config != nil { if err := runconfig.Merge(config, img.Config); err != nil { return nil, err } } if len(config.Entrypoint) == 0 && len(config.Cmd) == 0 { return nil, fmt.Errorf("No command specified") } return warnings, nil } func (daemon *Daemon) generateIdAndName(name string) (string, string, error) { var ( err error id = utils.GenerateRandomID() ) if name == "" { if name, err = daemon.generateNewName(id); err != nil { return "", "", err } return id, name, nil } if name, err = daemon.reserveName(id, name); err != nil { return "", "", err } return id, name, nil } func (daemon *Daemon) reserveName(id, name string) (string, error) { if !validContainerNamePattern.MatchString(name) { return "", fmt.Errorf("Invalid container name (%s), only %s are allowed", name, validContainerNameChars) } if name[0] != '/' { name = "/" + name } if _, err := daemon.containerGraph.Set(name, id); err != nil { if !graphdb.IsNonUniqueNameError(err) { return "", err } conflictingContainer, err := daemon.GetByName(name) if err != nil { if strings.Contains(err.Error(), "Could not find entity") { return "", err } // Remove name and continue starting the container if err := daemon.containerGraph.Delete(name); err != nil { return "", err } } else { nameAsKnownByUser := strings.TrimPrefix(name, "/") return "", fmt.Errorf( "Conflict, The name %s is already assigned to %s. You have to delete (or rename) that container to be able to assign %s to a container again.", nameAsKnownByUser, utils.TruncateID(conflictingContainer.ID), nameAsKnownByUser) } } return name, nil } func (daemon *Daemon) generateNewName(id string) (string, error) { var name string for i := 0; i < 6; i++ { name = namesgenerator.GetRandomName(i) if name[0] != '/' { name = "/" + name } if _, err := daemon.containerGraph.Set(name, id); err != nil { if !graphdb.IsNonUniqueNameError(err) { return "", err } continue } return name, nil } name = "/" + utils.TruncateID(id) if _, err := daemon.containerGraph.Set(name, id); err != nil { return "", err } return name, nil } func (daemon *Daemon) generateHostname(id string, config *runconfig.Config) { // Generate default hostname // FIXME: the lxc template no longer needs to set a default hostname if config.Hostname == "" { config.Hostname = id[:12] } } func (daemon *Daemon) getEntrypointAndArgs(config *runconfig.Config) (string, []string) { var ( entrypoint string args []string ) if len(config.Entrypoint) != 0 { entrypoint = config.Entrypoint[0] args = append(config.Entrypoint[1:], config.Cmd...) } else { entrypoint = config.Cmd[0] args = config.Cmd[1:] } return entrypoint, args } func (daemon *Daemon) newContainer(name string, config *runconfig.Config, img *image.Image) (*Container, error) { var ( id string err error ) id, name, err = daemon.generateIdAndName(name) if err != nil { return nil, err } daemon.generateHostname(id, config) entrypoint, args := daemon.getEntrypointAndArgs(config) container := &Container{ // FIXME: we should generate the ID here instead of receiving it as an argument ID: id, Created: time.Now().UTC(), Path: entrypoint, Args: args, //FIXME: de-duplicate from config Config: config, hostConfig: &runconfig.HostConfig{}, Image: img.ID, // Always use the resolved image id NetworkSettings: &NetworkSettings{}, Name: name, Driver: daemon.driver.String(), ExecDriver: daemon.execDriver.Name(), State: NewState(), } container.root = daemon.containerRoot(container.ID) if container.ProcessLabel, container.MountLabel, err = label.GenLabels(""); err != nil { return nil, err } return container, nil } func (daemon *Daemon) createRootfs(container *Container, img *image.Image) error { // Step 1: create the container directory. // This doubles as a barrier to avoid race conditions. if err := os.Mkdir(container.root, 0700); err != nil { return err } initID := fmt.Sprintf("%s-init", container.ID) if err := daemon.driver.Create(initID, img.ID); err != nil { return err } initPath, err := daemon.driver.Get(initID, "") if err != nil { return err } defer daemon.driver.Put(initID) if err := graph.SetupInitLayer(initPath); err != nil { return err } if err := daemon.driver.Create(container.ID, initID); err != nil { return err } return nil } func GetFullContainerName(name string) (string, error) { if name == "" { return "", fmt.Errorf("Container name cannot be empty") } if name[0] != '/' { name = "/" + name } return name, nil } func (daemon *Daemon) GetByName(name string) (*Container, error) { fullName, err := GetFullContainerName(name) if err != nil { return nil, err } entity := daemon.containerGraph.Get(fullName) if entity == nil { return nil, fmt.Errorf("Could not find entity for %s", name) } e := daemon.containers.Get(entity.ID()) if e == nil { return nil, fmt.Errorf("Could not find container for entity id %s", entity.ID()) } return e, nil } func (daemon *Daemon) Children(name string) (map[string]*Container, error) { name, err := GetFullContainerName(name) if err != nil { return nil, err } children := make(map[string]*Container) err = daemon.containerGraph.Walk(name, func(p string, e *graphdb.Entity) error { c := daemon.Get(e.ID()) if c == nil { return fmt.Errorf("Could not get container for name %s and id %s", e.ID(), p) } children[p] = c return nil }, 0) if err != nil { return nil, err } return children, nil } func (daemon *Daemon) RegisterLink(parent, child *Container, alias string) error { fullName := path.Join(parent.Name, alias) if !daemon.containerGraph.Exists(fullName) { _, err := daemon.containerGraph.Set(fullName, child.ID) return err } return nil } func (daemon *Daemon) RegisterLinks(container *Container, hostConfig *runconfig.HostConfig) error { if hostConfig != nil && hostConfig.Links != nil { for _, l := range hostConfig.Links { parts, err := parsers.PartParser("name:alias", l) if err != nil { return err } child, err := daemon.GetByName(parts["name"]) if err != nil { return err } if child == nil { return fmt.Errorf("Could not get container for %s", parts["name"]) } if err := daemon.RegisterLink(container, child, parts["alias"]); err != nil { return err } } // After we load all the links into the daemon // set them to nil on the hostconfig hostConfig.Links = nil if err := container.WriteHostConfig(); err != nil { return err } } return nil } // FIXME: harmonize with NewGraph() func NewDaemon(config *daemonconfig.Config, eng *engine.Engine) (*Daemon, error) { daemon, err := NewDaemonFromDirectory(config, eng) if err != nil { return nil, err } return daemon, nil } func NewDaemonFromDirectory(config *daemonconfig.Config, eng *engine.Engine) (*Daemon, error) { // Claim the pidfile first, to avoid any and all unexpected race conditions. // Some of the init doesn't need a pidfile lock - but let's not try to be smart. if config.Pidfile != "" { if err := utils.CreatePidFile(config.Pidfile); err != nil { return nil, err } eng.OnShutdown(func() { // Always release the pidfile last, just in case utils.RemovePidFile(config.Pidfile) }) } // Check that the system is supported and we have sufficient privileges // FIXME: return errors instead of calling Fatal if runtime.GOOS != "linux" { log.Fatalf("The Docker daemon is only supported on linux") } if os.Geteuid() != 0 { log.Fatalf("The Docker daemon needs to be run as root") } if err := checkKernelAndArch(); err != nil { log.Fatal(err) } // set up the TempDir to use a canonical path tmp, err := utils.TempDir(config.Root) if err != nil { log.Fatalf("Unable to get the TempDir under %s: %s", config.Root, err) } realTmp, err := utils.ReadSymlinkedDirectory(tmp) if err != nil { log.Fatalf("Unable to get the full path to the TempDir (%s): %s", tmp, err) } os.Setenv("TMPDIR", realTmp) if !config.EnableSelinuxSupport { selinuxSetDisabled() } // get the canonical path to the Docker root directory var realRoot string if _, err := os.Stat(config.Root); err != nil && os.IsNotExist(err) { realRoot = config.Root } else { realRoot, err = utils.ReadSymlinkedDirectory(config.Root) if err != nil { log.Fatalf("Unable to get the full path to root (%s): %s", config.Root, err) } } config.Root = realRoot // Create the root directory if it doesn't exists if err := os.MkdirAll(config.Root, 0700); err != nil && !os.IsExist(err) { return nil, err } // Set the default driver graphdriver.DefaultDriver = config.GraphDriver // Load storage driver driver, err := graphdriver.New(config.Root, config.GraphOptions) if err != nil { return nil, err } utils.Debugf("Using graph driver %s", driver) // As Docker on btrfs and SELinux are incompatible at present, error on both being enabled if config.EnableSelinuxSupport && driver.String() == "btrfs" { return nil, fmt.Errorf("SELinux is not supported with the BTRFS graph driver!") } daemonRepo := path.Join(config.Root, "containers") if err := os.MkdirAll(daemonRepo, 0700); err != nil && !os.IsExist(err) { return nil, err } // Migrate the container if it is aufs and aufs is enabled if err = migrateIfAufs(driver, config.Root); err != nil { return nil, err } utils.Debugf("Creating images graph") g, err := graph.NewGraph(path.Join(config.Root, "graph"), driver) if err != nil { return nil, err } // We don't want to use a complex driver like aufs or devmapper // for volumes, just a plain filesystem volumesDriver, err := graphdriver.GetDriver("vfs", config.Root, config.GraphOptions) if err != nil { return nil, err } utils.Debugf("Creating volumes graph") volumes, err := graph.NewGraph(path.Join(config.Root, "volumes"), volumesDriver) if err != nil { return nil, err } utils.Debugf("Creating repository list") repositories, err := graph.NewTagStore(path.Join(config.Root, "repositories-"+driver.String()), g) if err != nil { return nil, fmt.Errorf("Couldn't create Tag store: %s", err) } if !config.DisableNetwork { job := eng.Job("init_networkdriver") job.SetenvBool("EnableIptables", config.EnableIptables) job.SetenvBool("InterContainerCommunication", config.InterContainerCommunication) job.SetenvBool("EnableIpForward", config.EnableIpForward) job.Setenv("BridgeIface", config.BridgeIface) job.Setenv("BridgeIP", config.BridgeIP) job.Setenv("DefaultBindingIP", config.DefaultIp.String()) if err := job.Run(); err != nil { return nil, err } } graphdbPath := path.Join(config.Root, "linkgraph.db") graph, err := graphdb.NewSqliteConn(graphdbPath) if err != nil { return nil, err } localCopy := path.Join(config.Root, "init", fmt.Sprintf("dockerinit-%s", dockerversion.VERSION)) sysInitPath := utils.DockerInitPath(localCopy) if sysInitPath == "" { return nil, fmt.Errorf("Could not locate dockerinit: This usually means docker was built incorrectly. See http://docs.docker.com/contributing/devenvironment for official build instructions.") } if sysInitPath != localCopy { // When we find a suitable dockerinit binary (even if it's our local binary), we copy it into config.Root at localCopy for future use (so that the original can go away without that being a problem, for example during a package upgrade). if err := os.Mkdir(path.Dir(localCopy), 0700); err != nil && !os.IsExist(err) { return nil, err } if _, err := utils.CopyFile(sysInitPath, localCopy); err != nil { return nil, err } if err := os.Chmod(localCopy, 0700); err != nil { return nil, err } sysInitPath = localCopy } sysInfo := sysinfo.New(false) ed, err := execdrivers.NewDriver(config.ExecDriver, config.Root, sysInitPath, sysInfo) if err != nil { return nil, err } daemon := &Daemon{ repository: daemonRepo, containers: &contStore{s: make(map[string]*Container)}, graph: g, repositories: repositories, idIndex: truncindex.NewTruncIndex([]string{}), sysInfo: sysInfo, volumes: volumes, config: config, containerGraph: graph, driver: driver, sysInitPath: sysInitPath, execDriver: ed, eng: eng, Sockets: config.Sockets, } if err := daemon.checkLocaldns(); err != nil { return nil, err } if err := daemon.restore(); err != nil { return nil, err } // Setup shutdown handlers // FIXME: can these shutdown handlers be registered closer to their source? eng.OnShutdown(func() { // FIXME: if these cleanup steps can be called concurrently, register // them as separate handlers to speed up total shutdown time // FIXME: use engine logging instead of utils.Errorf if err := daemon.shutdown(); err != nil { utils.Errorf("daemon.shutdown(): %s", err) } if err := portallocator.ReleaseAll(); err != nil { utils.Errorf("portallocator.ReleaseAll(): %s", err) } if err := daemon.driver.Cleanup(); err != nil { utils.Errorf("daemon.driver.Cleanup(): %s", err.Error()) } if err := daemon.containerGraph.Close(); err != nil { utils.Errorf("daemon.containerGraph.Close(): %s", err.Error()) } }) return daemon, nil } func (daemon *Daemon) shutdown() error { group := sync.WaitGroup{} utils.Debugf("starting clean shutdown of all containers...") for _, container := range daemon.List() { c := container if c.State.IsRunning() { utils.Debugf("stopping %s", c.ID) group.Add(1) go func() { defer group.Done() if err := c.KillSig(15); err != nil { utils.Debugf("kill 15 error for %s - %s", c.ID, err) } c.State.WaitStop(-1 * time.Second) utils.Debugf("container stopped %s", c.ID) }() } } group.Wait() return nil } func (daemon *Daemon) Mount(container *Container) error { dir, err := daemon.driver.Get(container.ID, container.GetMountLabel()) if err != nil { return fmt.Errorf("Error getting container %s from driver %s: %s", container.ID, daemon.driver, err) } if container.basefs == "" { container.basefs = dir } else if container.basefs != dir { return fmt.Errorf("Error: driver %s is returning inconsistent paths for container %s ('%s' then '%s')", daemon.driver, container.ID, container.basefs, dir) } return nil } func (daemon *Daemon) Unmount(container *Container) error { daemon.driver.Put(container.ID) return nil } func (daemon *Daemon) Changes(container *Container) ([]archive.Change, error) { if differ, ok := daemon.driver.(graphdriver.Differ); ok { return differ.Changes(container.ID) } cDir, err := daemon.driver.Get(container.ID, "") if err != nil { return nil, fmt.Errorf("Error getting container rootfs %s from driver %s: %s", container.ID, container.daemon.driver, err) } defer daemon.driver.Put(container.ID) initDir, err := daemon.driver.Get(container.ID+"-init", "") if err != nil { return nil, fmt.Errorf("Error getting container init rootfs %s from driver %s: %s", container.ID, container.daemon.driver, err) } defer daemon.driver.Put(container.ID + "-init") return archive.ChangesDirs(cDir, initDir) } func (daemon *Daemon) Diff(container *Container) (archive.Archive, error) { if differ, ok := daemon.driver.(graphdriver.Differ); ok { return differ.Diff(container.ID) } changes, err := daemon.Changes(container) if err != nil { return nil, err } cDir, err := daemon.driver.Get(container.ID, "") if err != nil { return nil, fmt.Errorf("Error getting container rootfs %s from driver %s: %s", container.ID, container.daemon.driver, err) } archive, err := archive.ExportChanges(cDir, changes) if err != nil { return nil, err } return utils.NewReadCloserWrapper(archive, func() error { err := archive.Close() daemon.driver.Put(container.ID) return err }), nil } func (daemon *Daemon) Run(c *Container, pipes *execdriver.Pipes, startCallback execdriver.StartCallback) (int, error) { return daemon.execDriver.Run(c.command, pipes, startCallback) } func (daemon *Daemon) Pause(c *Container) error { if err := daemon.execDriver.Pause(c.command); err != nil { return err } c.State.SetPaused() return nil } func (daemon *Daemon) Unpause(c *Container) error { if err := daemon.execDriver.Unpause(c.command); err != nil { return err } c.State.SetUnpaused() return nil } func (daemon *Daemon) Kill(c *Container, sig int) error { return daemon.execDriver.Kill(c.command, sig) } // Nuke kills all containers then removes all content // from the content root, including images, volumes and // container filesystems. // Again: this will remove your entire docker daemon! // FIXME: this is deprecated, and only used in legacy // tests. Please remove. func (daemon *Daemon) Nuke() error { var wg sync.WaitGroup for _, container := range daemon.List() { wg.Add(1) go func(c *Container) { c.Kill() wg.Done() }(container) } wg.Wait() return os.RemoveAll(daemon.config.Root) } // FIXME: this is a convenience function for integration tests // which need direct access to daemon.graph. // Once the tests switch to using engine and jobs, this method // can go away. func (daemon *Daemon) Graph() *graph.Graph { return daemon.graph } func (daemon *Daemon) Repositories() *graph.TagStore { return daemon.repositories } func (daemon *Daemon) Config() *daemonconfig.Config { return daemon.config } func (daemon *Daemon) SystemConfig() *sysinfo.SysInfo { return daemon.sysInfo } func (daemon *Daemon) SystemInitPath() string { return daemon.sysInitPath } func (daemon *Daemon) GraphDriver() graphdriver.Driver { return daemon.driver } func (daemon *Daemon) ExecutionDriver() execdriver.Driver { return daemon.execDriver } func (daemon *Daemon) Volumes() *graph.Graph { return daemon.volumes } func (daemon *Daemon) ContainerGraph() *graphdb.Database { return daemon.containerGraph } func (daemon *Daemon) checkLocaldns() error { resolvConf, err := resolvconf.Get() if err != nil { return err } if len(daemon.config.Dns) == 0 && utils.CheckLocalDns(resolvConf) { log.Printf("Local (127.0.0.1) DNS resolver found in resolv.conf and containers can't use it. Using default external servers : %v\n", DefaultDns) daemon.config.Dns = DefaultDns } return nil } func (daemon *Daemon) ImageGetCached(imgID string, config *runconfig.Config) (*image.Image, error) { // Retrieve all images images, err := daemon.Graph().Map() if err != nil { return nil, err } // Store the tree in a map of map (map[parentId][childId]) imageMap := make(map[string]map[string]struct{}) for _, img := range images { if _, exists := imageMap[img.Parent]; !exists { imageMap[img.Parent] = make(map[string]struct{}) } imageMap[img.Parent][img.ID] = struct{}{} } // Loop on the children of the given image and check the config var match *image.Image for elem := range imageMap[imgID] { img, err := daemon.Graph().Get(elem) if err != nil { return nil, err } if runconfig.Compare(&img.ContainerConfig, config) { if match == nil || match.Created.Before(img.Created) { match = img } } } return match, nil } func checkKernelAndArch() error { // Check for unsupported architectures if runtime.GOARCH != "amd64" { return fmt.Errorf("The Docker runtime currently only supports amd64 (not %s). This will change in the future. Aborting.", runtime.GOARCH) } // Check for unsupported kernel versions // FIXME: it would be cleaner to not test for specific versions, but rather // test for specific functionalities. // Unfortunately we can't test for the feature "does not cause a kernel panic" // without actually causing a kernel panic, so we need this workaround until // the circumstances of pre-3.8 crashes are clearer. // For details see http://github.com/docker/docker/issues/407 if k, err := kernel.GetKernelVersion(); err != nil { log.Printf("WARNING: %s\n", err) } else { if kernel.CompareKernelVersion(k, &kernel.KernelVersionInfo{Kernel: 3, Major: 8, Minor: 0}) < 0 { if os.Getenv("DOCKER_NOWARN_KERNEL_VERSION") == "" { log.Printf("WARNING: You are running linux kernel version %s, which might be unstable running docker. Please upgrade your kernel to 3.8.0.", k.String()) } } } return nil }