// postRunProcessing perfoms any processing needed on the container after it has stopped. func (daemon *Daemon) postRunProcessing(container *container.Container, e libcontainerd.StateInfo) error { if e.ExitCode == 0 && e.UpdatePending { spec, err := daemon.createSpec(container) if err != nil { return err } newOpts := []libcontainerd.CreateOption{&libcontainerd.ServicingOption{ IsServicing: true, }} copts, err := daemon.getLibcontainerdCreateOptions(container) if err != nil { return err } if copts != nil { newOpts = append(newOpts, *copts...) } // Create a new servicing container, which will start, complete the update, and merge back the // results if it succeeded, all as part of the below function call. if err := daemon.containerd.Create((container.ID + "_servicing"), "", "", *spec, newOpts...); err != nil { container.SetExitCode(-1) return fmt.Errorf("Post-run update servicing failed: %s", err) } } return nil }
// 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, checkpoint string, resetRestartManager bool) (err error) { container.Lock() defer container.Unlock() if resetRestartManager && container.Running { // skip this check if already in restarting step and resetRestartManager==false 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 containers AutoRemove flag is set, remove it after clean up if container.HostConfig.AutoRemove { container.Unlock() if err := daemon.ContainerRm(container.ID, &types.ContainerRmConfig{ForceRemove: true, RemoveVolume: true}); err != nil { logrus.Errorf("can't remove container %s: %v", container.ID, err) } container.Lock() } } }() 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, err := daemon.getLibcontainerdCreateOptions(container) if err != nil { return err } if resetRestartManager { container.ResetRestartManager(true) } if err := daemon.containerd.Create(container.ID, checkpoint, container.CheckpointDir(), *spec, container.InitializeStdio, 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) } // attempted to mount a file onto a directory, or a directory onto a file, maybe from user specified bind mounts if strings.Contains(errDesc, syscall.ENOTDIR.Error()) { errDesc += ": Are you trying to mount a directory onto a file (or vice-versa)? Check if the specified host path exists and is the expected type" container.SetExitCode(127) } container.Reset(false) return fmt.Errorf("%s", errDesc) } return nil }
// 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 }