| package daemon |
| |
| import ( |
| "encoding/json" |
| "errors" |
| "fmt" |
| "io" |
| "io/ioutil" |
| "log" |
| "os" |
| "path" |
| "path/filepath" |
| "strings" |
| "sync" |
| "syscall" |
| "time" |
| |
| "github.com/docker/libcontainer/devices" |
| "github.com/docker/libcontainer/label" |
| "github.com/dotcloud/docker/archive" |
| "github.com/dotcloud/docker/daemon/execdriver" |
| "github.com/dotcloud/docker/daemon/graphdriver" |
| "github.com/dotcloud/docker/engine" |
| "github.com/dotcloud/docker/image" |
| "github.com/dotcloud/docker/links" |
| "github.com/dotcloud/docker/nat" |
| "github.com/dotcloud/docker/pkg/networkfs/etchosts" |
| "github.com/dotcloud/docker/pkg/networkfs/resolvconf" |
| "github.com/dotcloud/docker/pkg/symlink" |
| "github.com/dotcloud/docker/runconfig" |
| "github.com/dotcloud/docker/utils" |
| ) |
| |
| const DefaultPathEnv = "/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin" |
| |
| var ( |
| ErrNotATTY = errors.New("The PTY is not a file") |
| ErrNoTTY = errors.New("No PTY found") |
| ErrContainerStart = errors.New("The container failed to start. Unknown error") |
| ErrContainerStartTimeout = errors.New("The container failed to start due to timed out.") |
| ) |
| |
| type Container struct { |
| sync.Mutex |
| root string // Path to the "home" of the container, including metadata. |
| basefs string // Path to the graphdriver mountpoint |
| |
| ID string |
| |
| Created time.Time |
| |
| Path string |
| Args []string |
| |
| Config *runconfig.Config |
| State *State |
| Image string |
| |
| NetworkSettings *NetworkSettings |
| |
| ResolvConfPath string |
| HostnamePath string |
| HostsPath string |
| Name string |
| Driver string |
| ExecDriver string |
| |
| command *execdriver.Command |
| stdout *utils.WriteBroadcaster |
| stderr *utils.WriteBroadcaster |
| stdin io.ReadCloser |
| stdinPipe io.WriteCloser |
| |
| daemon *Daemon |
| MountLabel, ProcessLabel string |
| |
| Volumes map[string]string |
| // Store rw/ro in a separate structure to preserve reverse-compatibility on-disk. |
| // Easier than migrating older container configs :) |
| VolumesRW map[string]bool |
| hostConfig *runconfig.HostConfig |
| |
| activeLinks map[string]*links.Link |
| } |
| |
| func (container *Container) FromDisk() error { |
| pth, err := container.jsonPath() |
| if err != nil { |
| return err |
| } |
| |
| data, err := ioutil.ReadFile(pth) |
| if err != nil { |
| return err |
| } |
| // Load container settings |
| // udp broke compat of docker.PortMapping, but it's not used when loading a container, we can skip it |
| if err := json.Unmarshal(data, container); err != nil && !strings.Contains(err.Error(), "docker.PortMapping") { |
| return err |
| } |
| |
| if err := label.ReserveLabel(container.ProcessLabel); err != nil { |
| return err |
| } |
| return container.readHostConfig() |
| } |
| |
| func (container *Container) ToDisk() error { |
| data, err := json.Marshal(container) |
| if err != nil { |
| return err |
| } |
| |
| pth, err := container.jsonPath() |
| if err != nil { |
| return err |
| } |
| |
| err = ioutil.WriteFile(pth, data, 0666) |
| if err != nil { |
| return err |
| } |
| |
| return container.WriteHostConfig() |
| } |
| |
| func (container *Container) readHostConfig() error { |
| container.hostConfig = &runconfig.HostConfig{} |
| // If the hostconfig file does not exist, do not read it. |
| // (We still have to initialize container.hostConfig, |
| // but that's OK, since we just did that above.) |
| pth, err := container.hostConfigPath() |
| if err != nil { |
| return err |
| } |
| |
| _, err = os.Stat(pth) |
| if os.IsNotExist(err) { |
| return nil |
| } |
| |
| data, err := ioutil.ReadFile(pth) |
| if err != nil { |
| return err |
| } |
| return json.Unmarshal(data, container.hostConfig) |
| } |
| |
| func (container *Container) WriteHostConfig() error { |
| data, err := json.Marshal(container.hostConfig) |
| if err != nil { |
| return err |
| } |
| |
| pth, err := container.hostConfigPath() |
| if err != nil { |
| return err |
| } |
| |
| return ioutil.WriteFile(pth, data, 0666) |
| } |
| |
| func (container *Container) getResourcePath(path string) (string, error) { |
| cleanPath := filepath.Join("/", path) |
| return symlink.FollowSymlinkInScope(filepath.Join(container.basefs, cleanPath), container.basefs) |
| } |
| |
| func (container *Container) getRootResourcePath(path string) (string, error) { |
| cleanPath := filepath.Join("/", path) |
| return symlink.FollowSymlinkInScope(filepath.Join(container.root, cleanPath), container.root) |
| } |
| |
| func populateCommand(c *Container, env []string) error { |
| var ( |
| en *execdriver.Network |
| context = make(map[string][]string) |
| ) |
| context["process_label"] = []string{c.GetProcessLabel()} |
| context["mount_label"] = []string{c.GetMountLabel()} |
| |
| en = &execdriver.Network{ |
| Mtu: c.daemon.config.Mtu, |
| Interface: nil, |
| } |
| |
| parts := strings.SplitN(string(c.hostConfig.NetworkMode), ":", 2) |
| switch parts[0] { |
| case "none": |
| case "host": |
| en.HostNetworking = true |
| case "bridge", "": // empty string to support existing containers |
| if !c.Config.NetworkDisabled { |
| network := c.NetworkSettings |
| en.Interface = &execdriver.NetworkInterface{ |
| Gateway: network.Gateway, |
| Bridge: network.Bridge, |
| IPAddress: network.IPAddress, |
| IPPrefixLen: network.IPPrefixLen, |
| } |
| } |
| case "container": |
| nc, err := c.getNetworkedContainer() |
| if err != nil { |
| return err |
| } |
| en.ContainerID = nc.ID |
| default: |
| return fmt.Errorf("invalid network mode: %s", c.hostConfig.NetworkMode) |
| } |
| |
| // TODO: this can be removed after lxc-conf is fully deprecated |
| mergeLxcConfIntoOptions(c.hostConfig, context) |
| |
| resources := &execdriver.Resources{ |
| Memory: c.Config.Memory, |
| MemorySwap: c.Config.MemorySwap, |
| CpuShares: c.Config.CpuShares, |
| Cpuset: c.Config.Cpuset, |
| } |
| c.command = &execdriver.Command{ |
| ID: c.ID, |
| Privileged: c.hostConfig.Privileged, |
| Rootfs: c.RootfsPath(), |
| InitPath: "/.dockerinit", |
| Entrypoint: c.Path, |
| Arguments: c.Args, |
| WorkingDir: c.Config.WorkingDir, |
| Network: en, |
| Tty: c.Config.Tty, |
| User: c.Config.User, |
| Config: context, |
| Resources: resources, |
| AllowedDevices: devices.DefaultAllowedDevices, |
| AutoCreatedDevices: devices.DefaultAutoCreatedDevices, |
| } |
| c.command.SysProcAttr = &syscall.SysProcAttr{Setsid: true} |
| c.command.Env = env |
| return nil |
| } |
| |
| func (container *Container) Start() (err error) { |
| container.Lock() |
| defer container.Unlock() |
| |
| if container.State.IsRunning() { |
| return nil |
| } |
| // if we encounter and error during start we need to ensure that any other |
| // setup has been cleaned up properly |
| defer func() { |
| if err != nil { |
| container.cleanup() |
| } |
| }() |
| |
| if err := container.setupContainerDns(); err != nil { |
| return err |
| } |
| if err := container.Mount(); err != nil { |
| return err |
| } |
| if err := container.initializeNetworking(); err != nil { |
| return err |
| } |
| container.verifyDaemonSettings() |
| if err := prepareVolumesForContainer(container); err != nil { |
| return err |
| } |
| linkedEnv, err := container.setupLinkedContainers() |
| if err != nil { |
| return err |
| } |
| if err := container.setupWorkingDirectory(); err != nil { |
| return err |
| } |
| env := container.createDaemonEnvironment(linkedEnv) |
| if err := populateCommand(container, env); err != nil { |
| return err |
| } |
| if err := setupMountsForContainer(container); err != nil { |
| return err |
| } |
| if err := container.startLoggingToDisk(); err != nil { |
| return err |
| } |
| |
| return container.waitForStart() |
| } |
| |
| func (container *Container) Run() error { |
| if err := container.Start(); err != nil { |
| return err |
| } |
| container.State.WaitStop(-1 * time.Second) |
| return nil |
| } |
| |
| func (container *Container) Output() (output []byte, err error) { |
| pipe, err := container.StdoutPipe() |
| if err != nil { |
| return nil, err |
| } |
| defer pipe.Close() |
| if err := container.Start(); err != nil { |
| return nil, err |
| } |
| output, err = ioutil.ReadAll(pipe) |
| container.State.WaitStop(-1 * time.Second) |
| return output, err |
| } |
| |
| // Container.StdinPipe returns a WriteCloser which can be used to feed data |
| // to the standard input of the container's active process. |
| // Container.StdoutPipe and Container.StderrPipe each return a ReadCloser |
| // which can be used to retrieve the standard output (and error) generated |
| // by the container's active process. The output (and error) are actually |
| // copied and delivered to all StdoutPipe and StderrPipe consumers, using |
| // a kind of "broadcaster". |
| |
| func (container *Container) StdinPipe() (io.WriteCloser, error) { |
| return container.stdinPipe, nil |
| } |
| |
| func (container *Container) StdoutPipe() (io.ReadCloser, error) { |
| reader, writer := io.Pipe() |
| container.stdout.AddWriter(writer, "") |
| return utils.NewBufReader(reader), nil |
| } |
| |
| func (container *Container) StderrPipe() (io.ReadCloser, error) { |
| reader, writer := io.Pipe() |
| container.stderr.AddWriter(writer, "") |
| return utils.NewBufReader(reader), nil |
| } |
| |
| func (container *Container) StdoutLogPipe() io.ReadCloser { |
| reader, writer := io.Pipe() |
| container.stdout.AddWriter(writer, "stdout") |
| return utils.NewBufReader(reader) |
| } |
| |
| func (container *Container) StderrLogPipe() io.ReadCloser { |
| reader, writer := io.Pipe() |
| container.stderr.AddWriter(writer, "stderr") |
| return utils.NewBufReader(reader) |
| } |
| |
| func (container *Container) buildHostnameFile() error { |
| hostnamePath, err := container.getRootResourcePath("hostname") |
| if err != nil { |
| return err |
| } |
| container.HostnamePath = hostnamePath |
| |
| if container.Config.Domainname != "" { |
| return ioutil.WriteFile(container.HostnamePath, []byte(fmt.Sprintf("%s.%s\n", container.Config.Hostname, container.Config.Domainname)), 0644) |
| } |
| return ioutil.WriteFile(container.HostnamePath, []byte(container.Config.Hostname+"\n"), 0644) |
| } |
| |
| func (container *Container) buildHostnameAndHostsFiles(IP string) error { |
| if err := container.buildHostnameFile(); err != nil { |
| return err |
| } |
| |
| hostsPath, err := container.getRootResourcePath("hosts") |
| if err != nil { |
| return err |
| } |
| container.HostsPath = hostsPath |
| |
| extraContent := make(map[string]string) |
| |
| children, err := container.daemon.Children(container.Name) |
| if err != nil { |
| return err |
| } |
| |
| for linkAlias, child := range children { |
| _, alias := path.Split(linkAlias) |
| extraContent[alias] = child.NetworkSettings.IPAddress |
| } |
| |
| return etchosts.Build(container.HostsPath, IP, container.Config.Hostname, container.Config.Domainname, &extraContent) |
| } |
| |
| func (container *Container) allocateNetwork() error { |
| mode := container.hostConfig.NetworkMode |
| if container.Config.NetworkDisabled || mode.IsContainer() || mode.IsHost() { |
| return nil |
| } |
| |
| var ( |
| env *engine.Env |
| err error |
| eng = container.daemon.eng |
| ) |
| |
| job := eng.Job("allocate_interface", container.ID) |
| if env, err = job.Stdout.AddEnv(); err != nil { |
| return err |
| } |
| if err := job.Run(); err != nil { |
| return err |
| } |
| |
| if container.Config.PortSpecs != nil { |
| if err := migratePortMappings(container.Config, container.hostConfig); err != nil { |
| return err |
| } |
| container.Config.PortSpecs = nil |
| if err := container.WriteHostConfig(); err != nil { |
| return err |
| } |
| } |
| |
| var ( |
| portSpecs = make(nat.PortSet) |
| bindings = make(nat.PortMap) |
| ) |
| |
| if container.Config.ExposedPorts != nil { |
| portSpecs = container.Config.ExposedPorts |
| } |
| if container.hostConfig.PortBindings != nil { |
| bindings = container.hostConfig.PortBindings |
| } |
| |
| container.NetworkSettings.PortMapping = nil |
| |
| for port := range portSpecs { |
| if err := container.allocatePort(eng, port, bindings); err != nil { |
| return err |
| } |
| } |
| container.WriteHostConfig() |
| |
| container.NetworkSettings.Ports = bindings |
| container.NetworkSettings.Bridge = env.Get("Bridge") |
| container.NetworkSettings.IPAddress = env.Get("IP") |
| container.NetworkSettings.IPPrefixLen = env.GetInt("IPPrefixLen") |
| container.NetworkSettings.Gateway = env.Get("Gateway") |
| |
| return nil |
| } |
| |
| func (container *Container) releaseNetwork() { |
| if container.Config.NetworkDisabled { |
| return |
| } |
| eng := container.daemon.eng |
| |
| eng.Job("release_interface", container.ID).Run() |
| container.NetworkSettings = &NetworkSettings{} |
| } |
| |
| func (container *Container) monitor(callback execdriver.StartCallback) error { |
| var ( |
| err error |
| exitCode int |
| ) |
| |
| pipes := execdriver.NewPipes(container.stdin, container.stdout, container.stderr, container.Config.OpenStdin) |
| exitCode, err = container.daemon.Run(container, pipes, callback) |
| if err != nil { |
| utils.Errorf("Error running container: %s", err) |
| } |
| container.State.SetStopped(exitCode) |
| |
| // Cleanup |
| container.cleanup() |
| |
| // Re-create a brand new stdin pipe once the container exited |
| if container.Config.OpenStdin { |
| container.stdin, container.stdinPipe = io.Pipe() |
| } |
| if container.daemon != nil && container.daemon.srv != nil { |
| container.daemon.srv.LogEvent("die", container.ID, container.daemon.repositories.ImageName(container.Image)) |
| } |
| if container.daemon != nil && container.daemon.srv != nil && container.daemon.srv.IsRunning() { |
| // FIXME: here is race condition between two RUN instructions in Dockerfile |
| // because they share same runconfig and change image. Must be fixed |
| // in server/buildfile.go |
| if err := container.ToDisk(); err != nil { |
| utils.Errorf("Error dumping container %s state to disk: %s\n", container.ID, err) |
| } |
| } |
| return err |
| } |
| |
| func (container *Container) cleanup() { |
| container.releaseNetwork() |
| |
| // Disable all active links |
| if container.activeLinks != nil { |
| for _, link := range container.activeLinks { |
| link.Disable() |
| } |
| } |
| if container.Config.OpenStdin { |
| if err := container.stdin.Close(); err != nil { |
| utils.Errorf("%s: Error close stdin: %s", container.ID, err) |
| } |
| } |
| if err := container.stdout.CloseWriters(); err != nil { |
| utils.Errorf("%s: Error close stdout: %s", container.ID, err) |
| } |
| if err := container.stderr.CloseWriters(); err != nil { |
| utils.Errorf("%s: Error close stderr: %s", container.ID, err) |
| } |
| if container.command != nil && container.command.Terminal != nil { |
| if err := container.command.Terminal.Close(); err != nil { |
| utils.Errorf("%s: Error closing terminal: %s", container.ID, err) |
| } |
| } |
| |
| if err := container.Unmount(); err != nil { |
| log.Printf("%v: Failed to umount filesystem: %v", container.ID, err) |
| } |
| } |
| |
| func (container *Container) KillSig(sig int) error { |
| utils.Debugf("Sending %d to %s", sig, container.ID) |
| container.Lock() |
| defer container.Unlock() |
| |
| // We could unpause the container for them rather than returning this error |
| if container.State.IsPaused() { |
| return fmt.Errorf("Container %s is paused. Unpause the container before stopping", container.ID) |
| } |
| |
| if !container.State.IsRunning() { |
| return nil |
| } |
| return container.daemon.Kill(container, sig) |
| } |
| |
| func (container *Container) Pause() error { |
| if container.State.IsPaused() { |
| return fmt.Errorf("Container %s is already paused", container.ID) |
| } |
| if !container.State.IsRunning() { |
| return fmt.Errorf("Container %s is not running", container.ID) |
| } |
| return container.daemon.Pause(container) |
| } |
| |
| func (container *Container) Unpause() error { |
| if !container.State.IsPaused() { |
| return fmt.Errorf("Container %s is not paused", container.ID) |
| } |
| if !container.State.IsRunning() { |
| return fmt.Errorf("Container %s is not running", container.ID) |
| } |
| return container.daemon.Unpause(container) |
| } |
| |
| func (container *Container) Kill() error { |
| if !container.State.IsRunning() { |
| return nil |
| } |
| |
| // 1. Send SIGKILL |
| if err := container.KillSig(9); err != nil { |
| return err |
| } |
| |
| // 2. Wait for the process to die, in last resort, try to kill the process directly |
| if _, err := container.State.WaitStop(10 * time.Second); err != nil { |
| // Ensure that we don't kill ourselves |
| if pid := container.State.GetPid(); pid != 0 { |
| log.Printf("Container %s failed to exit within 10 seconds of kill - trying direct SIGKILL", utils.TruncateID(container.ID)) |
| if err := syscall.Kill(pid, 9); err != nil { |
| return err |
| } |
| } |
| } |
| |
| container.State.WaitStop(-1 * time.Second) |
| return nil |
| } |
| |
| func (container *Container) Stop(seconds int) error { |
| if !container.State.IsRunning() { |
| return nil |
| } |
| |
| // 1. Send a SIGTERM |
| if err := container.KillSig(15); err != nil { |
| log.Print("Failed to send SIGTERM to the process, force killing") |
| if err := container.KillSig(9); err != nil { |
| return err |
| } |
| } |
| |
| // 2. Wait for the process to exit on its own |
| if _, err := container.State.WaitStop(time.Duration(seconds) * time.Second); err != nil { |
| log.Printf("Container %v failed to exit within %d seconds of SIGTERM - using the force", container.ID, seconds) |
| // 3. If it doesn't, then send SIGKILL |
| if err := container.Kill(); err != nil { |
| container.State.WaitStop(-1 * time.Second) |
| return err |
| } |
| } |
| return nil |
| } |
| |
| func (container *Container) Restart(seconds int) error { |
| // Avoid unnecessarily unmounting and then directly mounting |
| // the container when the container stops and then starts |
| // again |
| if err := container.Mount(); err == nil { |
| defer container.Unmount() |
| } |
| |
| if err := container.Stop(seconds); err != nil { |
| return err |
| } |
| return container.Start() |
| } |
| |
| func (container *Container) Resize(h, w int) error { |
| return container.command.Terminal.Resize(h, w) |
| } |
| |
| func (container *Container) ExportRw() (archive.Archive, error) { |
| if err := container.Mount(); err != nil { |
| return nil, err |
| } |
| if container.daemon == nil { |
| return nil, fmt.Errorf("Can't load storage driver for unregistered container %s", container.ID) |
| } |
| archive, err := container.daemon.Diff(container) |
| if err != nil { |
| container.Unmount() |
| return nil, err |
| } |
| return utils.NewReadCloserWrapper(archive, func() error { |
| err := archive.Close() |
| container.Unmount() |
| return err |
| }), |
| nil |
| } |
| |
| func (container *Container) Export() (archive.Archive, error) { |
| if err := container.Mount(); err != nil { |
| return nil, err |
| } |
| |
| archive, err := archive.Tar(container.basefs, archive.Uncompressed) |
| if err != nil { |
| container.Unmount() |
| return nil, err |
| } |
| return utils.NewReadCloserWrapper(archive, func() error { |
| err := archive.Close() |
| container.Unmount() |
| return err |
| }), |
| nil |
| } |
| |
| func (container *Container) Mount() error { |
| return container.daemon.Mount(container) |
| } |
| |
| func (container *Container) Changes() ([]archive.Change, error) { |
| container.Lock() |
| defer container.Unlock() |
| return container.daemon.Changes(container) |
| } |
| |
| func (container *Container) GetImage() (*image.Image, error) { |
| if container.daemon == nil { |
| return nil, fmt.Errorf("Can't get image of unregistered container") |
| } |
| return container.daemon.graph.Get(container.Image) |
| } |
| |
| func (container *Container) Unmount() error { |
| return container.daemon.Unmount(container) |
| } |
| |
| func (container *Container) logPath(name string) (string, error) { |
| return container.getRootResourcePath(fmt.Sprintf("%s-%s.log", container.ID, name)) |
| } |
| |
| func (container *Container) ReadLog(name string) (io.Reader, error) { |
| pth, err := container.logPath(name) |
| if err != nil { |
| return nil, err |
| } |
| return os.Open(pth) |
| } |
| |
| func (container *Container) hostConfigPath() (string, error) { |
| return container.getRootResourcePath("hostconfig.json") |
| } |
| |
| func (container *Container) jsonPath() (string, error) { |
| return container.getRootResourcePath("config.json") |
| } |
| |
| // This method must be exported to be used from the lxc template |
| // This directory is only usable when the container is running |
| func (container *Container) RootfsPath() string { |
| return container.basefs |
| } |
| |
| func validateID(id string) error { |
| if id == "" { |
| return fmt.Errorf("Invalid empty id") |
| } |
| return nil |
| } |
| |
| // GetSize, return real size, virtual size |
| func (container *Container) GetSize() (int64, int64) { |
| var ( |
| sizeRw, sizeRootfs int64 |
| err error |
| driver = container.daemon.driver |
| ) |
| |
| if err := container.Mount(); err != nil { |
| utils.Errorf("Warning: failed to compute size of container rootfs %s: %s", container.ID, err) |
| return sizeRw, sizeRootfs |
| } |
| defer container.Unmount() |
| |
| if differ, ok := container.daemon.driver.(graphdriver.Differ); ok { |
| sizeRw, err = differ.DiffSize(container.ID) |
| if err != nil { |
| utils.Errorf("Warning: driver %s couldn't return diff size of container %s: %s", driver, container.ID, err) |
| // FIXME: GetSize should return an error. Not changing it now in case |
| // there is a side-effect. |
| sizeRw = -1 |
| } |
| } else { |
| changes, _ := container.Changes() |
| if changes != nil { |
| sizeRw = archive.ChangesSize(container.basefs, changes) |
| } else { |
| sizeRw = -1 |
| } |
| } |
| |
| if _, err = os.Stat(container.basefs); err != nil { |
| if sizeRootfs, err = utils.TreeSize(container.basefs); err != nil { |
| sizeRootfs = -1 |
| } |
| } |
| return sizeRw, sizeRootfs |
| } |
| |
| func (container *Container) Copy(resource string) (io.ReadCloser, error) { |
| if err := container.Mount(); err != nil { |
| return nil, err |
| } |
| |
| var filter []string |
| |
| basePath, err := container.getResourcePath(resource) |
| if err != nil { |
| container.Unmount() |
| return nil, err |
| } |
| |
| stat, err := os.Stat(basePath) |
| if err != nil { |
| container.Unmount() |
| return nil, err |
| } |
| if !stat.IsDir() { |
| d, f := path.Split(basePath) |
| basePath = d |
| filter = []string{f} |
| } else { |
| filter = []string{path.Base(basePath)} |
| basePath = path.Dir(basePath) |
| } |
| |
| archive, err := archive.TarWithOptions(basePath, &archive.TarOptions{ |
| Compression: archive.Uncompressed, |
| Includes: filter, |
| }) |
| if err != nil { |
| container.Unmount() |
| return nil, err |
| } |
| return utils.NewReadCloserWrapper(archive, func() error { |
| err := archive.Close() |
| container.Unmount() |
| return err |
| }), |
| nil |
| } |
| |
| // Returns true if the container exposes a certain port |
| func (container *Container) Exposes(p nat.Port) bool { |
| _, exists := container.Config.ExposedPorts[p] |
| return exists |
| } |
| |
| func (container *Container) GetPtyMaster() (*os.File, error) { |
| ttyConsole, ok := container.command.Terminal.(execdriver.TtyTerminal) |
| if !ok { |
| return nil, ErrNoTTY |
| } |
| return ttyConsole.Master(), nil |
| } |
| |
| func (container *Container) HostConfig() *runconfig.HostConfig { |
| container.Lock() |
| res := container.hostConfig |
| container.Unlock() |
| return res |
| } |
| |
| func (container *Container) SetHostConfig(hostConfig *runconfig.HostConfig) { |
| container.Lock() |
| container.hostConfig = hostConfig |
| container.Unlock() |
| } |
| |
| func (container *Container) DisableLink(name string) { |
| if container.activeLinks != nil { |
| if link, exists := container.activeLinks[name]; exists { |
| link.Disable() |
| } else { |
| utils.Debugf("Could not find active link for %s", name) |
| } |
| } |
| } |
| |
| func (container *Container) setupContainerDns() error { |
| if container.ResolvConfPath != "" { |
| return nil |
| } |
| |
| var ( |
| config = container.hostConfig |
| daemon = container.daemon |
| ) |
| |
| if config.NetworkMode == "host" { |
| container.ResolvConfPath = "/etc/resolv.conf" |
| return nil |
| } |
| |
| resolvConf, err := resolvconf.Get() |
| if err != nil { |
| return err |
| } |
| |
| // If custom dns exists, then create a resolv.conf for the container |
| if len(config.Dns) > 0 || len(daemon.config.Dns) > 0 || len(config.DnsSearch) > 0 || len(daemon.config.DnsSearch) > 0 { |
| var ( |
| dns = resolvconf.GetNameservers(resolvConf) |
| dnsSearch = resolvconf.GetSearchDomains(resolvConf) |
| ) |
| if len(config.Dns) > 0 { |
| dns = config.Dns |
| } else if len(daemon.config.Dns) > 0 { |
| dns = daemon.config.Dns |
| } |
| if len(config.DnsSearch) > 0 { |
| dnsSearch = config.DnsSearch |
| } else if len(daemon.config.DnsSearch) > 0 { |
| dnsSearch = daemon.config.DnsSearch |
| } |
| |
| resolvConfPath, err := container.getRootResourcePath("resolv.conf") |
| if err != nil { |
| return err |
| } |
| container.ResolvConfPath = resolvConfPath |
| |
| return resolvconf.Build(container.ResolvConfPath, dns, dnsSearch) |
| } else { |
| container.ResolvConfPath = "/etc/resolv.conf" |
| } |
| return nil |
| } |
| |
| func (container *Container) initializeNetworking() error { |
| var err error |
| if container.hostConfig.NetworkMode.IsHost() { |
| container.Config.Hostname, err = os.Hostname() |
| if err != nil { |
| return err |
| } |
| |
| parts := strings.SplitN(container.Config.Hostname, ".", 2) |
| if len(parts) > 1 { |
| container.Config.Hostname = parts[0] |
| container.Config.Domainname = parts[1] |
| } |
| |
| content, err := ioutil.ReadFile("/etc/hosts") |
| if os.IsNotExist(err) { |
| return container.buildHostnameAndHostsFiles("") |
| } else if err != nil { |
| return err |
| } |
| |
| if err := container.buildHostnameFile(); err != nil { |
| return err |
| } |
| |
| hostsPath, err := container.getRootResourcePath("hosts") |
| if err != nil { |
| return err |
| } |
| container.HostsPath = hostsPath |
| |
| return ioutil.WriteFile(container.HostsPath, content, 0644) |
| } else if container.hostConfig.NetworkMode.IsContainer() { |
| // we need to get the hosts files from the container to join |
| nc, err := container.getNetworkedContainer() |
| if err != nil { |
| return err |
| } |
| container.HostsPath = nc.HostsPath |
| container.ResolvConfPath = nc.ResolvConfPath |
| container.Config.Hostname = nc.Config.Hostname |
| container.Config.Domainname = nc.Config.Domainname |
| } else if container.daemon.config.DisableNetwork { |
| container.Config.NetworkDisabled = true |
| return container.buildHostnameAndHostsFiles("127.0.1.1") |
| } else { |
| if err := container.allocateNetwork(); err != nil { |
| return err |
| } |
| return container.buildHostnameAndHostsFiles(container.NetworkSettings.IPAddress) |
| } |
| return nil |
| } |
| |
| // Make sure the config is compatible with the current kernel |
| func (container *Container) verifyDaemonSettings() { |
| if container.Config.Memory > 0 && !container.daemon.sysInfo.MemoryLimit { |
| log.Printf("WARNING: Your kernel does not support memory limit capabilities. Limitation discarded.\n") |
| container.Config.Memory = 0 |
| } |
| if container.Config.Memory > 0 && !container.daemon.sysInfo.SwapLimit { |
| log.Printf("WARNING: Your kernel does not support swap limit capabilities. Limitation discarded.\n") |
| container.Config.MemorySwap = -1 |
| } |
| if container.daemon.sysInfo.IPv4ForwardingDisabled { |
| log.Printf("WARNING: IPv4 forwarding is disabled. Networking will not work") |
| } |
| } |
| |
| func (container *Container) setupLinkedContainers() ([]string, error) { |
| var ( |
| env []string |
| daemon = container.daemon |
| ) |
| children, err := daemon.Children(container.Name) |
| if err != nil { |
| return nil, err |
| } |
| |
| if len(children) > 0 { |
| container.activeLinks = make(map[string]*links.Link, len(children)) |
| |
| // If we encounter an error make sure that we rollback any network |
| // config and ip table changes |
| rollback := func() { |
| for _, link := range container.activeLinks { |
| link.Disable() |
| } |
| container.activeLinks = nil |
| } |
| |
| for linkAlias, child := range children { |
| if !child.State.IsRunning() { |
| return nil, fmt.Errorf("Cannot link to a non running container: %s AS %s", child.Name, linkAlias) |
| } |
| |
| link, err := links.NewLink( |
| container.NetworkSettings.IPAddress, |
| child.NetworkSettings.IPAddress, |
| linkAlias, |
| child.Config.Env, |
| child.Config.ExposedPorts, |
| daemon.eng) |
| |
| if err != nil { |
| rollback() |
| return nil, err |
| } |
| |
| container.activeLinks[link.Alias()] = link |
| if err := link.Enable(); err != nil { |
| rollback() |
| return nil, err |
| } |
| |
| for _, envVar := range link.ToEnv() { |
| env = append(env, envVar) |
| } |
| } |
| } |
| return env, nil |
| } |
| |
| func (container *Container) createDaemonEnvironment(linkedEnv []string) []string { |
| // Setup environment |
| env := []string{ |
| "HOME=/", |
| "PATH=" + DefaultPathEnv, |
| "HOSTNAME=" + container.Config.Hostname, |
| } |
| if container.Config.Tty { |
| env = append(env, "TERM=xterm") |
| } |
| env = append(env, linkedEnv...) |
| // because the env on the container can override certain default values |
| // we need to replace the 'env' keys where they match and append anything |
| // else. |
| env = utils.ReplaceOrAppendEnvValues(env, container.Config.Env) |
| |
| return env |
| } |
| |
| func (container *Container) setupWorkingDirectory() error { |
| if container.Config.WorkingDir != "" { |
| container.Config.WorkingDir = path.Clean(container.Config.WorkingDir) |
| |
| pth, err := container.getResourcePath(container.Config.WorkingDir) |
| if err != nil { |
| return err |
| } |
| |
| pthInfo, err := os.Stat(pth) |
| if err != nil { |
| if !os.IsNotExist(err) { |
| return err |
| } |
| |
| if err := os.MkdirAll(pth, 0755); err != nil { |
| return err |
| } |
| } |
| if pthInfo != nil && !pthInfo.IsDir() { |
| return fmt.Errorf("Cannot mkdir: %s is not a directory", container.Config.WorkingDir) |
| } |
| } |
| return nil |
| } |
| |
| func (container *Container) startLoggingToDisk() error { |
| // Setup logging of stdout and stderr to disk |
| pth, err := container.logPath("json") |
| if err != nil { |
| return err |
| } |
| |
| if err := container.daemon.LogToDisk(container.stdout, pth, "stdout"); err != nil { |
| return err |
| } |
| |
| if err := container.daemon.LogToDisk(container.stderr, pth, "stderr"); err != nil { |
| return err |
| } |
| |
| return nil |
| } |
| |
| func (container *Container) waitForStart() error { |
| callback := func(command *execdriver.Command) { |
| if command.Tty { |
| // The callback is called after the process Start() |
| // so we are in the parent process. In TTY mode, stdin/out/err is the PtySlace |
| // which we close here. |
| if c, ok := command.Stdout.(io.Closer); ok { |
| c.Close() |
| } |
| } |
| if err := container.ToDisk(); err != nil { |
| utils.Debugf("%s", err) |
| } |
| container.State.SetRunning(command.Pid()) |
| } |
| |
| // We use a callback here instead of a goroutine and an chan for |
| // syncronization purposes |
| cErr := utils.Go(func() error { return container.monitor(callback) }) |
| |
| waitStart := make(chan struct{}) |
| |
| go func() { |
| container.State.WaitRunning(-1 * time.Second) |
| close(waitStart) |
| }() |
| |
| // Start should not return until the process is actually running |
| select { |
| case <-waitStart: |
| case err := <-cErr: |
| return err |
| } |
| return nil |
| } |
| |
| func (container *Container) allocatePort(eng *engine.Engine, port nat.Port, bindings nat.PortMap) error { |
| binding := bindings[port] |
| if container.hostConfig.PublishAllPorts && len(binding) == 0 { |
| binding = append(binding, nat.PortBinding{}) |
| } |
| |
| for i := 0; i < len(binding); i++ { |
| b := binding[i] |
| |
| job := eng.Job("allocate_port", container.ID) |
| job.Setenv("HostIP", b.HostIp) |
| job.Setenv("HostPort", b.HostPort) |
| job.Setenv("Proto", port.Proto()) |
| job.Setenv("ContainerPort", port.Port()) |
| |
| portEnv, err := job.Stdout.AddEnv() |
| if err != nil { |
| return err |
| } |
| if err := job.Run(); err != nil { |
| eng.Job("release_interface", container.ID).Run() |
| return err |
| } |
| b.HostIp = portEnv.Get("HostIP") |
| b.HostPort = portEnv.Get("HostPort") |
| |
| binding[i] = b |
| } |
| bindings[port] = binding |
| return nil |
| } |
| |
| func (container *Container) GetProcessLabel() string { |
| // even if we have a process label return "" if we are running |
| // in privileged mode |
| if container.hostConfig.Privileged { |
| return "" |
| } |
| return container.ProcessLabel |
| } |
| |
| func (container *Container) GetMountLabel() string { |
| if container.hostConfig.Privileged { |
| return "" |
| } |
| return container.MountLabel |
| } |
| |
| func (container *Container) getNetworkedContainer() (*Container, error) { |
| parts := strings.SplitN(string(container.hostConfig.NetworkMode), ":", 2) |
| switch parts[0] { |
| case "container": |
| nc := container.daemon.Get(parts[1]) |
| if nc == nil { |
| return nil, fmt.Errorf("no such container to join network: %s", parts[1]) |
| } |
| if !nc.State.IsRunning() { |
| return nil, fmt.Errorf("cannot join network of a non running container: %s", parts[1]) |
| } |
| return nc, nil |
| default: |
| return nil, fmt.Errorf("network mode not set to container") |
| } |
| } |