| package daemon |
| |
| import ( |
| "fmt" |
| "net/http" |
| "runtime" |
| "strings" |
| "syscall" |
| |
| "google.golang.org/grpc" |
| |
| "github.com/Sirupsen/logrus" |
| "github.com/docker/docker/container" |
| "github.com/docker/docker/errors" |
| "github.com/docker/docker/libcontainerd" |
| "github.com/docker/docker/runconfig" |
| containertypes "github.com/docker/engine-api/types/container" |
| ) |
| |
| // ContainerStart starts a container. |
| func (daemon *Daemon) ContainerStart(name string, hostConfig *containertypes.HostConfig) error { |
| container, err := daemon.GetContainer(name) |
| if err != nil { |
| return err |
| } |
| |
| if container.IsPaused() { |
| return fmt.Errorf("Cannot start a paused container, try unpause instead.") |
| } |
| |
| if container.IsRunning() { |
| err := fmt.Errorf("Container already started") |
| return errors.NewErrorWithStatusCode(err, http.StatusNotModified) |
| } |
| |
| // Windows does not have the backwards compatibility issue here. |
| if runtime.GOOS != "windows" { |
| // This is kept for backward compatibility - hostconfig should be passed when |
| // creating a container, not during start. |
| if hostConfig != nil { |
| logrus.Warn("DEPRECATED: Setting host configuration options when the container starts is deprecated and will be removed in Docker 1.12") |
| oldNetworkMode := container.HostConfig.NetworkMode |
| if err := daemon.setSecurityOptions(container, hostConfig); err != nil { |
| return err |
| } |
| if err := daemon.mergeAndVerifyLogConfig(&hostConfig.LogConfig); err != nil { |
| return err |
| } |
| if err := daemon.setHostConfig(container, hostConfig); err != nil { |
| return err |
| } |
| newNetworkMode := container.HostConfig.NetworkMode |
| if string(oldNetworkMode) != string(newNetworkMode) { |
| // if user has change the network mode on starting, clean up the |
| // old networks. It is a deprecated feature and will be removed in Docker 1.12 |
| container.NetworkSettings.Networks = nil |
| if err := container.ToDisk(); err != nil { |
| return err |
| } |
| } |
| container.InitDNSHostConfig() |
| } |
| } else { |
| if hostConfig != nil { |
| return fmt.Errorf("Supplying a hostconfig on start is not supported. It should be supplied on create") |
| } |
| } |
| |
| // check if hostConfig is in line with the current system settings. |
| // It may happen cgroups are umounted or the like. |
| if _, err = daemon.verifyContainerSettings(container.HostConfig, nil, false); err != nil { |
| return err |
| } |
| // Adapt for old containers in case we have updates in this function and |
| // old containers never have chance to call the new function in create stage. |
| if err := daemon.adaptContainerSettings(container.HostConfig, false); err != nil { |
| return err |
| } |
| |
| return daemon.containerStart(container) |
| } |
| |
| // Start starts a container |
| func (daemon *Daemon) Start(container *container.Container) error { |
| return daemon.containerStart(container) |
| } |
| |
| // containerStart prepares the container to run by setting up everything the |
| // container needs, such as storage and networking, as well as links |
| // between containers. The container is left waiting for a signal to |
| // begin running. |
| func (daemon *Daemon) containerStart(container *container.Container) (err error) { |
| container.Lock() |
| defer container.Unlock() |
| |
| if container.Running { |
| return nil |
| } |
| |
| if container.RemovalInProgress || container.Dead { |
| return fmt.Errorf("Container is marked for removal and cannot be started.") |
| } |
| |
| // if we encounter an error during start we need to ensure that any other |
| // setup has been cleaned up properly |
| defer func() { |
| if err != nil { |
| container.SetError(err) |
| // if no one else has set it, make sure we don't leave it at zero |
| if container.ExitCode() == 0 { |
| container.SetExitCode(128) |
| } |
| container.ToDisk() |
| daemon.Cleanup(container) |
| } |
| }() |
| |
| if err := daemon.conditionalMountOnStart(container); err != nil { |
| return err |
| } |
| |
| // Make sure NetworkMode has an acceptable value. We do this to ensure |
| // backwards API compatibility. |
| container.HostConfig = runconfig.SetDefaultNetModeIfBlank(container.HostConfig) |
| |
| if err := daemon.initializeNetworking(container); err != nil { |
| return err |
| } |
| |
| spec, err := daemon.createSpec(container) |
| if err != nil { |
| return err |
| } |
| |
| createOptions := []libcontainerd.CreateOption{libcontainerd.WithRestartManager(container.RestartManager(true))} |
| copts, err := daemon.getLibcontainerdCreateOptions(container) |
| if err != nil { |
| return err |
| } |
| if copts != nil { |
| createOptions = append(createOptions, *copts...) |
| } |
| |
| if err := daemon.containerd.Create(container.ID, *spec, createOptions...); err != nil { |
| errDesc := grpc.ErrorDesc(err) |
| logrus.Errorf("Create container failed with error: %s", errDesc) |
| // if we receive an internal error from the initial start of a container then lets |
| // return it instead of entering the restart loop |
| // set to 127 for container cmd not found/does not exist) |
| if strings.Contains(errDesc, container.Path) && |
| (strings.Contains(errDesc, "executable file not found") || |
| strings.Contains(errDesc, "no such file or directory") || |
| strings.Contains(errDesc, "system cannot find the file specified")) { |
| container.SetExitCode(127) |
| } |
| // set to 126 for container cmd can't be invoked errors |
| if strings.Contains(errDesc, syscall.EACCES.Error()) { |
| container.SetExitCode(126) |
| } |
| |
| container.Reset(false) |
| |
| return fmt.Errorf("%s", errDesc) |
| } |
| |
| return nil |
| } |
| |
| // Cleanup releases any network resources allocated to the container along with any rules |
| // around how containers are linked together. It also unmounts the container's root filesystem. |
| func (daemon *Daemon) Cleanup(container *container.Container) { |
| daemon.releaseNetwork(container) |
| |
| container.UnmountIpcMounts(detachMounted) |
| |
| if err := daemon.conditionalUnmountOnCleanup(container); err != nil { |
| // FIXME: remove once reference counting for graphdrivers has been refactored |
| // Ensure that all the mounts are gone |
| if mountid, err := daemon.layerStore.GetMountID(container.ID); err == nil { |
| daemon.cleanupMountsByID(mountid) |
| } |
| } |
| |
| for _, eConfig := range container.ExecCommands.Commands() { |
| daemon.unregisterExecCommand(container, eConfig) |
| } |
| |
| if container.BaseFS != "" { |
| if err := container.UnmountVolumes(false, daemon.LogVolumeEvent); err != nil { |
| logrus.Warnf("%s cleanup: Failed to umount volumes: %v", container.ID, err) |
| } |
| } |
| container.CancelAttachContext() |
| } |