| package daemon |
| |
| import ( |
| "errors" |
| "fmt" |
| "io" |
| "io/ioutil" |
| "net" |
| "os" |
| "path" |
| "path/filepath" |
| "regexp" |
| "runtime" |
| "strings" |
| "sync" |
| "time" |
| |
| "github.com/docker/libcontainer/label" |
| "github.com/docker/libnetwork" |
| "github.com/docker/libnetwork/netlabel" |
| "github.com/docker/libnetwork/options" |
| |
| "github.com/Sirupsen/logrus" |
| "github.com/docker/docker/api" |
| "github.com/docker/docker/autogen/dockerversion" |
| "github.com/docker/docker/daemon/events" |
| "github.com/docker/docker/daemon/execdriver" |
| "github.com/docker/docker/daemon/execdriver/execdrivers" |
| "github.com/docker/docker/daemon/graphdriver" |
| _ "github.com/docker/docker/daemon/graphdriver/vfs" |
| "github.com/docker/docker/daemon/logger" |
| "github.com/docker/docker/daemon/network" |
| "github.com/docker/docker/graph" |
| "github.com/docker/docker/image" |
| "github.com/docker/docker/nat" |
| "github.com/docker/docker/pkg/archive" |
| "github.com/docker/docker/pkg/broadcastwriter" |
| "github.com/docker/docker/pkg/fileutils" |
| "github.com/docker/docker/pkg/graphdb" |
| "github.com/docker/docker/pkg/ioutils" |
| "github.com/docker/docker/pkg/namesgenerator" |
| "github.com/docker/docker/pkg/parsers" |
| "github.com/docker/docker/pkg/parsers/kernel" |
| "github.com/docker/docker/pkg/stringid" |
| "github.com/docker/docker/pkg/sysinfo" |
| "github.com/docker/docker/pkg/truncindex" |
| "github.com/docker/docker/registry" |
| "github.com/docker/docker/runconfig" |
| "github.com/docker/docker/trust" |
| "github.com/docker/docker/utils" |
| volumedrivers "github.com/docker/docker/volume/drivers" |
| "github.com/docker/docker/volume/local" |
| "github.com/docker/libcontainer/netlink" |
| ) |
| |
| var ( |
| validContainerNameChars = `[a-zA-Z0-9][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 { |
| ID string |
| repository string |
| sysInitPath string |
| containers *contStore |
| execCommands *execStore |
| graph *graph.Graph |
| repositories *graph.TagStore |
| idIndex *truncindex.TruncIndex |
| sysInfo *sysinfo.SysInfo |
| config *Config |
| containerGraph *graphdb.Database |
| driver graphdriver.Driver |
| execDriver execdriver.Driver |
| statsCollector *statsCollector |
| defaultLogConfig runconfig.LogConfig |
| RegistryService *registry.Service |
| EventsService *events.Events |
| netController libnetwork.NetworkController |
| root string |
| } |
| |
| // Get looks for a container using the provided information, which could be |
| // one of the following inputs from the caller: |
| // - A full container ID, which will exact match a container in daemon's list |
| // - A container name, which will only exact match via the GetByName() function |
| // - A partial container ID prefix (e.g. short ID) of any length that is |
| // unique enough to only return a single container object |
| // If none of these searches succeed, an error is returned |
| func (daemon *Daemon) Get(prefixOrName string) (*Container, error) { |
| if containerByID := daemon.containers.Get(prefixOrName); containerByID != nil { |
| // prefix is an exact match to a full container ID |
| return containerByID, nil |
| } |
| |
| // GetByName will match only an exact name provided; we ignore errors |
| containerByName, _ := daemon.GetByName(prefixOrName) |
| containerId, indexError := daemon.idIndex.Get(prefixOrName) |
| |
| if containerByName != nil { |
| // prefix is an exact match to a full container Name |
| return containerByName, nil |
| } |
| |
| if containerId != "" { |
| // prefix is a fuzzy match to a container ID |
| return daemon.containers.Get(containerId), nil |
| } |
| return nil, indexError |
| } |
| |
| // Exists returns a true if a container of the specified ID or name exists, |
| // false otherwise. |
| func (daemon *Daemon) Exists(id string) bool { |
| c, _ := daemon.Get(id) |
| return c != 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{ |
| CommonContainer: daemon.newBaseContainer(id), |
| } |
| |
| 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 <container.ID> |
| // This is a wrapper for register |
| func (daemon *Daemon) Register(container *Container) error { |
| return daemon.register(container, true) |
| } |
| |
| // register makes a container object usable by the daemon as <container.ID> |
| func (daemon *Daemon) register(container *Container, updateSuffixarray bool) 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 = ioutils.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) |
| |
| if err := daemon.verifyVolumesInfo(container); err != nil { |
| return err |
| } |
| |
| if err := container.prepareMountPoints(); err != nil { |
| return err |
| } |
| |
| if container.IsRunning() { |
| logrus.Debugf("killing old running container %s", container.ID) |
| |
| container.SetStopped(&execdriver.ExitStatus{ExitCode: 0}) |
| |
| // use the current driver and ensure that the container is dead x.x |
| cmd := &execdriver.Command{ |
| ID: container.ID, |
| } |
| daemon.execDriver.Terminate(cmd) |
| |
| if err := container.Unmount(); err != nil { |
| logrus.Debugf("unmount error %s", err) |
| } |
| if err := container.ToDisk(); err != nil { |
| logrus.Debugf("saving stopped state to disk %s", err) |
| } |
| } |
| |
| 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 { |
| logrus.Debugf("Error saving container name %s", err) |
| } |
| } |
| return nil |
| } |
| |
| func (daemon *Daemon) restore() error { |
| type cr struct { |
| container *Container |
| registered bool |
| } |
| |
| var ( |
| debug = (os.Getenv("DEBUG") != "" || os.Getenv("TEST") != "") |
| currentDriver = daemon.driver.String() |
| containers = make(map[string]*cr) |
| ) |
| |
| if !debug { |
| logrus.Info("Loading containers: start.") |
| } |
| 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 && logrus.GetLevel() == logrus.InfoLevel { |
| fmt.Print(".") |
| } |
| if err != nil { |
| logrus.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 { |
| logrus.Debugf("Loaded container %v", container.ID) |
| |
| containers[container.ID] = &cr{container: container} |
| } else { |
| logrus.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 && logrus.GetLevel() == logrus.InfoLevel { |
| fmt.Print(".") |
| } |
| |
| e := entities[p] |
| |
| if c, ok := containers[e.ID()]; ok { |
| c.registered = true |
| } |
| } |
| } |
| |
| group := sync.WaitGroup{} |
| for _, c := range containers { |
| group.Add(1) |
| |
| go func(container *Container, registered bool) { |
| defer group.Done() |
| |
| if !registered { |
| // 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 { |
| logrus.Debugf("Setting default id - %s", err) |
| } |
| } |
| |
| if err := daemon.register(container, false); err != nil { |
| logrus.Debugf("Failed to register container %s: %s", container.ID, err) |
| } |
| |
| // check the restart policy on the containers and restart any container with |
| // the restart policy of "always" |
| if daemon.config.AutoRestart && container.shouldRestart() { |
| logrus.Debugf("Starting container %s", container.ID) |
| |
| if err := container.Start(); err != nil { |
| logrus.Debugf("Failed to start container %s: %s", container.ID, err) |
| } |
| } |
| }(c.container, c.registered) |
| } |
| group.Wait() |
| |
| if !debug { |
| if logrus.GetLevel() == logrus.InfoLevel { |
| fmt.Println() |
| } |
| logrus.Info("Loading containers: done.") |
| } |
| |
| 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 (img != nil && 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 != nil && img.Config != nil { |
| if err := runconfig.Merge(config, img.Config); err != nil { |
| return nil, err |
| } |
| } |
| if config.Entrypoint.Len() == 0 && config.Cmd.Len() == 0 { |
| return nil, fmt.Errorf("No command specified") |
| } |
| return warnings, nil |
| } |
| |
| func (daemon *Daemon) generateIdAndName(name string) (string, string, error) { |
| var ( |
| err error |
| id = stringid.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 %q is already in use by container %s. You have to delete (or rename) that container to be able to reuse that name.", nameAsKnownByUser, |
| stringid.TruncateID(conflictingContainer.ID)) |
| } |
| } |
| 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 = "/" + stringid.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(configEntrypoint *runconfig.Entrypoint, configCmd *runconfig.Command) (string, []string) { |
| var ( |
| entrypoint string |
| args []string |
| ) |
| |
| cmdSlice := configCmd.Slice() |
| if configEntrypoint.Len() != 0 { |
| eSlice := configEntrypoint.Slice() |
| entrypoint = eSlice[0] |
| args = append(eSlice[1:], cmdSlice...) |
| } else { |
| entrypoint = cmdSlice[0] |
| args = cmdSlice[1:] |
| } |
| return entrypoint, args |
| } |
| |
| func parseSecurityOpt(container *Container, config *runconfig.HostConfig) error { |
| var ( |
| labelOpts []string |
| err error |
| ) |
| |
| for _, opt := range config.SecurityOpt { |
| con := strings.SplitN(opt, ":", 2) |
| if len(con) == 1 { |
| return fmt.Errorf("Invalid --security-opt: %q", opt) |
| } |
| switch con[0] { |
| case "label": |
| labelOpts = append(labelOpts, con[1]) |
| case "apparmor": |
| container.AppArmorProfile = con[1] |
| default: |
| return fmt.Errorf("Invalid --security-opt: %q", opt) |
| } |
| } |
| |
| container.ProcessLabel, container.MountLabel, err = label.InitLabels(labelOpts) |
| return err |
| } |
| |
| func (daemon *Daemon) newContainer(name string, config *runconfig.Config, imgID string) (*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.Entrypoint, config.Cmd) |
| |
| base := daemon.newBaseContainer(id) |
| base.Created = time.Now().UTC() |
| base.Path = entrypoint |
| base.Args = args //FIXME: de-duplicate from config |
| base.Config = config |
| base.hostConfig = &runconfig.HostConfig{} |
| base.ImageID = imgID |
| base.NetworkSettings = &network.Settings{} |
| base.Name = name |
| base.Driver = daemon.driver.String() |
| base.ExecDriver = daemon.execDriver.Name() |
| |
| container := &Container{ |
| CommonContainer: base, |
| } |
| |
| return container, err |
| } |
| |
| func (daemon *Daemon) createRootfs(container *Container) 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, container.ImageID); 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, err := daemon.Get(e.ID()) |
| if err != nil { |
| return err |
| } |
| children[p] = c |
| return nil |
| }, 0) |
| |
| if err != nil { |
| return nil, err |
| } |
| return children, nil |
| } |
| |
| func (daemon *Daemon) Parents(name string) ([]string, error) { |
| name, err := GetFullContainerName(name) |
| if err != nil { |
| return nil, err |
| } |
| |
| return daemon.containerGraph.Parents(name) |
| } |
| |
| 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 { |
| name, alias, err := parsers.ParseLink(l) |
| if err != nil { |
| return err |
| } |
| child, err := daemon.Get(name) |
| if err != nil { |
| //An error from daemon.Get() means this name could not be found |
| return fmt.Errorf("Could not get container for %s", name) |
| } |
| for child.hostConfig.NetworkMode.IsContainer() { |
| parts := strings.SplitN(string(child.hostConfig.NetworkMode), ":", 2) |
| child, err = daemon.Get(parts[1]) |
| if err != nil { |
| return fmt.Errorf("Could not get container for %s", parts[1]) |
| } |
| } |
| if child.hostConfig.NetworkMode.IsHost() { |
| return runconfig.ErrConflictHostNetworkAndLinks |
| } |
| if err := daemon.RegisterLink(container, child, 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 |
| } |
| |
| func NewDaemon(config *Config, registryService *registry.Service) (daemon *Daemon, err error) { |
| // Check for mutually incompatible config options |
| if config.Bridge.Iface != "" && config.Bridge.IP != "" { |
| return nil, fmt.Errorf("You specified -b & --bip, mutually exclusive options. Please specify only one.") |
| } |
| setDefaultMtu(config) |
| |
| if !config.Bridge.EnableIPTables && !config.Bridge.InterContainerCommunication { |
| return nil, fmt.Errorf("You specified --iptables=false with --icc=false. ICC uses iptables to function. Please set --icc or --iptables to true.") |
| } |
| if !config.Bridge.EnableIPTables && config.Bridge.EnableIPMasq { |
| config.Bridge.EnableIPMasq = false |
| } |
| config.DisableBridge = config.Bridge.Iface == disableNetworkBridge |
| |
| // Check that the system is supported and we have sufficient privileges |
| if runtime.GOOS != "linux" { |
| return nil, fmt.Errorf("The Docker daemon is only supported on linux") |
| } |
| if os.Geteuid() != 0 { |
| return nil, fmt.Errorf("The Docker daemon needs to be run as root") |
| } |
| if err := checkKernel(); err != nil { |
| return nil, err |
| } |
| |
| // set up SIGUSR1 handler to dump Go routine stacks |
| setupSigusr1Trap() |
| |
| // set up the tmpDir to use a canonical path |
| tmp, err := tempDir(config.Root) |
| if err != nil { |
| return nil, fmt.Errorf("Unable to get the TempDir under %s: %s", config.Root, err) |
| } |
| realTmp, err := fileutils.ReadSymlinkedDirectory(tmp) |
| if err != nil { |
| return nil, fmt.Errorf("Unable to get the full path to the TempDir (%s): %s", tmp, err) |
| } |
| os.Setenv("TMPDIR", realTmp) |
| |
| // 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 = fileutils.ReadSymlinkedDirectory(config.Root) |
| if err != nil { |
| return nil, fmt.Errorf("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, fmt.Errorf("error initializing graphdriver: %v", err) |
| } |
| logrus.Debugf("Using graph driver %s", driver) |
| |
| d := &Daemon{} |
| d.driver = driver |
| |
| defer func() { |
| if err != nil { |
| if err := d.Shutdown(); err != nil { |
| logrus.Error(err) |
| } |
| } |
| }() |
| |
| // Verify logging driver type |
| if config.LogConfig.Type != "none" { |
| if _, err := logger.GetLogDriver(config.LogConfig.Type); err != nil { |
| return nil, fmt.Errorf("error finding the logging driver: %v", err) |
| } |
| } |
| logrus.Debugf("Using default logging driver %s", config.LogConfig.Type) |
| |
| if config.EnableSelinuxSupport { |
| if selinuxEnabled() { |
| // As Docker on btrfs and SELinux are incompatible at present, error on both being enabled |
| if d.driver.String() == "btrfs" { |
| return nil, fmt.Errorf("SELinux is not supported with the BTRFS graph driver") |
| } |
| logrus.Debug("SELinux enabled successfully") |
| } else { |
| logrus.Warn("Docker could not enable SELinux on the host system") |
| } |
| } else { |
| selinuxSetDisabled() |
| } |
| |
| 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(d.driver, config.Root); err != nil { |
| return nil, err |
| } |
| |
| logrus.Debug("Creating images graph") |
| g, err := graph.NewGraph(path.Join(config.Root, "graph"), d.driver) |
| if err != nil { |
| return nil, err |
| } |
| |
| volumesDriver, err := local.New(config.Root) |
| if err != nil { |
| return nil, err |
| } |
| volumedrivers.Register(volumesDriver, volumesDriver.Name()) |
| |
| trustKey, err := api.LoadOrCreateTrustKey(config.TrustKeyPath) |
| if err != nil { |
| return nil, err |
| } |
| |
| trustDir := path.Join(config.Root, "trust") |
| if err := os.MkdirAll(trustDir, 0700); err != nil && !os.IsExist(err) { |
| return nil, err |
| } |
| trustService, err := trust.NewTrustStore(trustDir) |
| if err != nil { |
| return nil, fmt.Errorf("could not create trust store: %s", err) |
| } |
| |
| eventsService := events.New() |
| logrus.Debug("Creating repository list") |
| tagCfg := &graph.TagStoreConfig{ |
| Graph: g, |
| Key: trustKey, |
| Registry: registryService, |
| Events: eventsService, |
| Trust: trustService, |
| } |
| repositories, err := graph.NewTagStore(path.Join(config.Root, "repositories-"+d.driver.String()), tagCfg) |
| if err != nil { |
| return nil, fmt.Errorf("Couldn't create Tag store: %s", err) |
| } |
| |
| d.netController, err = initNetworkController(config) |
| if err != nil { |
| return nil, fmt.Errorf("Error initializing network controller: %v", err) |
| } |
| |
| graphdbPath := path.Join(config.Root, "linkgraph.db") |
| graph, err := graphdb.NewSqliteConn(graphdbPath) |
| if err != nil { |
| return nil, err |
| } |
| |
| d.containerGraph = graph |
| |
| 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 https://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 := fileutils.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.ExecOptions, config.ExecRoot, config.Root, sysInitPath, sysInfo) |
| if err != nil { |
| return nil, err |
| } |
| |
| d.ID = trustKey.PublicKey().KeyID() |
| d.repository = daemonRepo |
| d.containers = &contStore{s: make(map[string]*Container)} |
| d.execCommands = newExecStore() |
| d.graph = g |
| d.repositories = repositories |
| d.idIndex = truncindex.NewTruncIndex([]string{}) |
| d.sysInfo = sysInfo |
| d.config = config |
| d.sysInitPath = sysInitPath |
| d.execDriver = ed |
| d.statsCollector = newStatsCollector(1 * time.Second) |
| d.defaultLogConfig = config.LogConfig |
| d.RegistryService = registryService |
| d.EventsService = eventsService |
| d.root = config.Root |
| |
| if err := d.restore(); err != nil { |
| return nil, err |
| } |
| |
| return d, nil |
| } |
| |
| func initNetworkController(config *Config) (libnetwork.NetworkController, error) { |
| controller, err := libnetwork.New() |
| if err != nil { |
| return nil, fmt.Errorf("error obtaining controller instance: %v", err) |
| } |
| |
| // Initialize default driver "null" |
| |
| if err := controller.ConfigureNetworkDriver("null", options.Generic{}); err != nil { |
| return nil, fmt.Errorf("Error initializing null driver: %v", err) |
| } |
| |
| // Initialize default network on "null" |
| if _, err := controller.NewNetwork("null", "none"); err != nil { |
| return nil, fmt.Errorf("Error creating default \"null\" network: %v", err) |
| } |
| |
| // Initialize default driver "host" |
| if err := controller.ConfigureNetworkDriver("host", options.Generic{}); err != nil { |
| return nil, fmt.Errorf("Error initializing host driver: %v", err) |
| } |
| |
| // Initialize default network on "host" |
| if _, err := controller.NewNetwork("host", "host"); err != nil { |
| return nil, fmt.Errorf("Error creating default \"host\" network: %v", err) |
| } |
| |
| if !config.DisableBridge { |
| // Initialize default driver "bridge" |
| if err := initBridgeDriver(controller, config); err != nil { |
| return nil, err |
| } |
| } |
| |
| return controller, nil |
| } |
| |
| func initBridgeDriver(controller libnetwork.NetworkController, config *Config) error { |
| option := options.Generic{ |
| "EnableIPForwarding": config.Bridge.EnableIPForward} |
| |
| if err := controller.ConfigureNetworkDriver("bridge", options.Generic{netlabel.GenericData: option}); err != nil { |
| return fmt.Errorf("Error initializing bridge driver: %v", err) |
| } |
| |
| netOption := options.Generic{ |
| "BridgeName": config.Bridge.Iface, |
| "Mtu": config.Mtu, |
| "EnableIPTables": config.Bridge.EnableIPTables, |
| "EnableIPMasquerade": config.Bridge.EnableIPMasq, |
| "EnableICC": config.Bridge.InterContainerCommunication, |
| "EnableUserlandProxy": config.Bridge.EnableUserlandProxy, |
| } |
| |
| if config.Bridge.IP != "" { |
| ip, bipNet, err := net.ParseCIDR(config.Bridge.IP) |
| if err != nil { |
| return err |
| } |
| |
| bipNet.IP = ip |
| netOption["AddressIPv4"] = bipNet |
| } |
| |
| if config.Bridge.FixedCIDR != "" { |
| _, fCIDR, err := net.ParseCIDR(config.Bridge.FixedCIDR) |
| if err != nil { |
| return err |
| } |
| |
| netOption["FixedCIDR"] = fCIDR |
| } |
| |
| if config.Bridge.FixedCIDRv6 != "" { |
| _, fCIDRv6, err := net.ParseCIDR(config.Bridge.FixedCIDRv6) |
| if err != nil { |
| return err |
| } |
| |
| netOption["FixedCIDRv6"] = fCIDRv6 |
| } |
| |
| if config.Bridge.DefaultGatewayIPv4 != nil { |
| netOption["DefaultGatewayIPv4"] = config.Bridge.DefaultGatewayIPv4 |
| } |
| |
| if config.Bridge.DefaultGatewayIPv6 != nil { |
| netOption["DefaultGatewayIPv6"] = config.Bridge.DefaultGatewayIPv6 |
| } |
| |
| // --ip processing |
| if config.Bridge.DefaultIP != nil { |
| netOption["DefaultBindingIP"] = config.Bridge.DefaultIP |
| } |
| |
| // Initialize default network on "bridge" with the same name |
| _, err := controller.NewNetwork("bridge", "bridge", |
| libnetwork.NetworkOptionGeneric(options.Generic{ |
| netlabel.GenericData: netOption, |
| netlabel.EnableIPv6: config.Bridge.EnableIPv6, |
| })) |
| if err != nil { |
| return fmt.Errorf("Error creating default \"bridge\" network: %v", err) |
| } |
| return nil |
| } |
| |
| func (daemon *Daemon) Shutdown() error { |
| if daemon.containers != nil { |
| group := sync.WaitGroup{} |
| logrus.Debug("starting clean shutdown of all containers...") |
| for _, container := range daemon.List() { |
| c := container |
| if c.IsRunning() { |
| logrus.Debugf("stopping %s", c.ID) |
| group.Add(1) |
| |
| go func() { |
| defer group.Done() |
| // If container failed to exit in 10 seconds of SIGTERM, then using the force |
| if err := c.Stop(10); err != nil { |
| logrus.Errorf("Stop container %s with error: %v", c.ID, err) |
| } |
| c.WaitStop(-1 * time.Second) |
| logrus.Debugf("container stopped %s", c.ID) |
| }() |
| } |
| } |
| group.Wait() |
| |
| // trigger libnetwork GC only if it's initialized |
| if daemon.netController != nil { |
| daemon.netController.GC() |
| } |
| } |
| |
| if daemon.containerGraph != nil { |
| if err := daemon.containerGraph.Close(); err != nil { |
| logrus.Errorf("Error during container graph.Close(): %v", err) |
| } |
| } |
| |
| if daemon.driver != nil { |
| if err := daemon.driver.Cleanup(); err != nil { |
| logrus.Errorf("Error during graph storage driver.Cleanup(): %v", err) |
| } |
| } |
| |
| 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 { |
| daemon.driver.Put(container.ID) |
| 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) { |
| initID := fmt.Sprintf("%s-init", container.ID) |
| return daemon.driver.Changes(container.ID, initID) |
| } |
| |
| func (daemon *Daemon) Diff(container *Container) (archive.Archive, error) { |
| initID := fmt.Sprintf("%s-init", container.ID) |
| return daemon.driver.Diff(container.ID, initID) |
| } |
| |
| func (daemon *Daemon) Run(c *Container, pipes *execdriver.Pipes, startCallback execdriver.StartCallback) (execdriver.ExitStatus, error) { |
| return daemon.execDriver.Run(c.command, pipes, startCallback) |
| } |
| |
| func (daemon *Daemon) Kill(c *Container, sig int) error { |
| return daemon.execDriver.Kill(c.command, sig) |
| } |
| |
| func (daemon *Daemon) Stats(c *Container) (*execdriver.ResourceStats, error) { |
| return daemon.execDriver.Stats(c.ID) |
| } |
| |
| func (daemon *Daemon) SubscribeToContainerStats(name string) (chan interface{}, error) { |
| c, err := daemon.Get(name) |
| if err != nil { |
| return nil, err |
| } |
| ch := daemon.statsCollector.collect(c) |
| return ch, nil |
| } |
| |
| func (daemon *Daemon) UnsubscribeToContainerStats(name string, ch chan interface{}) error { |
| c, err := daemon.Get(name) |
| if err != nil { |
| return err |
| } |
| daemon.statsCollector.unsubscribe(c, ch) |
| return nil |
| } |
| |
| // 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() *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) ContainerGraph() *graphdb.Database { |
| return daemon.containerGraph |
| } |
| |
| 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, ok := images[elem] |
| if !ok { |
| return nil, fmt.Errorf("unable to find image %q", elem) |
| } |
| if runconfig.Compare(&img.ContainerConfig, config) { |
| if match == nil || match.Created.Before(img.Created) { |
| match = img |
| } |
| } |
| } |
| return match, nil |
| } |
| |
| // tempDir returns the default directory to use for temporary files. |
| func tempDir(rootDir string) (string, error) { |
| var tmpDir string |
| if tmpDir = os.Getenv("DOCKER_TMPDIR"); tmpDir == "" { |
| tmpDir = filepath.Join(rootDir, "tmp") |
| } |
| return tmpDir, os.MkdirAll(tmpDir, 0700) |
| } |
| |
| func checkKernel() error { |
| // 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-3.10 crashes are clearer. |
| // For details see https://github.com/docker/docker/issues/407 |
| if k, err := kernel.GetKernelVersion(); err != nil { |
| logrus.Warnf("%s", err) |
| } else { |
| if kernel.CompareKernelVersion(k, &kernel.KernelVersionInfo{Kernel: 3, Major: 10, Minor: 0}) < 0 { |
| if os.Getenv("DOCKER_NOWARN_KERNEL_VERSION") == "" { |
| logrus.Warnf("You are running linux kernel version %s, which might be unstable running docker. Please upgrade your kernel to 3.10.0.", k.String()) |
| } |
| } |
| } |
| return nil |
| } |
| |
| func (daemon *Daemon) verifyHostConfig(hostConfig *runconfig.HostConfig) ([]string, error) { |
| var warnings []string |
| |
| if hostConfig == nil { |
| return warnings, nil |
| } |
| |
| for port := range hostConfig.PortBindings { |
| _, portStr := nat.SplitProtoPort(string(port)) |
| if _, err := nat.ParsePort(portStr); err != nil { |
| return warnings, fmt.Errorf("Invalid port specification: %s", portStr) |
| } |
| } |
| |
| if hostConfig.LxcConf.Len() > 0 && !strings.Contains(daemon.ExecutionDriver().Name(), "lxc") { |
| return warnings, fmt.Errorf("Cannot use --lxc-conf with execdriver: %s", daemon.ExecutionDriver().Name()) |
| } |
| if hostConfig.Memory != 0 && hostConfig.Memory < 4194304 { |
| return warnings, fmt.Errorf("Minimum memory limit allowed is 4MB") |
| } |
| if hostConfig.Memory > 0 && !daemon.SystemConfig().MemoryLimit { |
| warnings = append(warnings, "Your kernel does not support memory limit capabilities. Limitation discarded.") |
| hostConfig.Memory = 0 |
| } |
| if hostConfig.Memory > 0 && hostConfig.MemorySwap != -1 && !daemon.SystemConfig().SwapLimit { |
| warnings = append(warnings, "Your kernel does not support swap limit capabilities, memory limited without swap.") |
| hostConfig.MemorySwap = -1 |
| } |
| if hostConfig.Memory > 0 && hostConfig.MemorySwap > 0 && hostConfig.MemorySwap < hostConfig.Memory { |
| return warnings, fmt.Errorf("Minimum memoryswap limit should be larger than memory limit, see usage.") |
| } |
| if hostConfig.Memory == 0 && hostConfig.MemorySwap > 0 { |
| return warnings, fmt.Errorf("You should always set the Memory limit when using Memoryswap limit, see usage.") |
| } |
| if hostConfig.CpuPeriod > 0 && !daemon.SystemConfig().CpuCfsPeriod { |
| warnings = append(warnings, "Your kernel does not support CPU cfs period. Period discarded.") |
| hostConfig.CpuPeriod = 0 |
| } |
| if hostConfig.CpuQuota > 0 && !daemon.SystemConfig().CpuCfsQuota { |
| warnings = append(warnings, "Your kernel does not support CPU cfs quota. Quota discarded.") |
| hostConfig.CpuQuota = 0 |
| } |
| if hostConfig.BlkioWeight > 0 && (hostConfig.BlkioWeight < 10 || hostConfig.BlkioWeight > 1000) { |
| return warnings, fmt.Errorf("Range of blkio weight is from 10 to 1000.") |
| } |
| if hostConfig.OomKillDisable && !daemon.SystemConfig().OomKillDisable { |
| hostConfig.OomKillDisable = false |
| return warnings, fmt.Errorf("Your kernel does not support oom kill disable.") |
| } |
| |
| return warnings, nil |
| } |
| |
| func (daemon *Daemon) setHostConfig(container *Container, hostConfig *runconfig.HostConfig) error { |
| container.Lock() |
| if err := parseSecurityOpt(container, hostConfig); err != nil { |
| container.Unlock() |
| return err |
| } |
| container.Unlock() |
| |
| // Do not lock while creating volumes since this could be calling out to external plugins |
| // Don't want to block other actions, like `docker ps` because we're waiting on an external plugin |
| if err := daemon.registerMountPoints(container, hostConfig); err != nil { |
| return err |
| } |
| |
| container.Lock() |
| defer container.Unlock() |
| // Register any links from the host config before starting the container |
| if err := daemon.RegisterLinks(container, hostConfig); err != nil { |
| return err |
| } |
| |
| container.hostConfig = hostConfig |
| container.toDisk() |
| return nil |
| } |
| |
| func (daemon *Daemon) newBaseContainer(id string) CommonContainer { |
| return CommonContainer{ |
| ID: id, |
| State: NewState(), |
| MountPoints: make(map[string]*mountPoint), |
| Volumes: make(map[string]string), |
| VolumesRW: make(map[string]bool), |
| execCommands: newExecStore(), |
| root: daemon.containerRoot(id), |
| } |
| } |
| |
| func setDefaultMtu(config *Config) { |
| // do nothing if the config does not have the default 0 value. |
| if config.Mtu != 0 { |
| return |
| } |
| config.Mtu = defaultNetworkMtu |
| if routeMtu, err := getDefaultRouteMtu(); err == nil { |
| config.Mtu = routeMtu |
| } |
| } |
| |
| var errNoDefaultRoute = errors.New("no default route was found") |
| |
| // getDefaultRouteMtu returns the MTU for the default route's interface. |
| func getDefaultRouteMtu() (int, error) { |
| routes, err := netlink.NetworkGetRoutes() |
| if err != nil { |
| return 0, err |
| } |
| for _, r := range routes { |
| if r.Default { |
| return r.Iface.MTU, nil |
| } |
| } |
| return 0, errNoDefaultRoute |
| } |