package daemon // import "github.com/docker/docker/daemon" import ( "context" "errors" "fmt" "runtime" "strconv" "time" "github.com/docker/docker/api/types" "github.com/docker/docker/container" "github.com/docker/docker/libcontainerd" "github.com/docker/docker/restartmanager" "github.com/sirupsen/logrus" ) func (daemon *Daemon) setStateCounter(c *container.Container) { switch c.StateString() { case "paused": stateCtr.set(c.ID, "paused") case "running": stateCtr.set(c.ID, "running") default: stateCtr.set(c.ID, "stopped") } } // ProcessEvent is called by libcontainerd whenever an event occurs func (daemon *Daemon) ProcessEvent(id string, e libcontainerd.EventType, ei libcontainerd.EventInfo) error { c, err := daemon.GetContainer(id) if c == nil || err != nil { return fmt.Errorf("no such container: %s", id) } switch e { case libcontainerd.EventOOM: // StateOOM is Linux specific and should never be hit on Windows if runtime.GOOS == "windows" { return errors.New("received StateOOM from libcontainerd on Windows. This should never happen") } c.Lock() defer c.Unlock() daemon.updateHealthMonitor(c) if err := c.CheckpointTo(daemon.containersReplica); err != nil { return err } daemon.LogContainerEvent(c, "oom") case libcontainerd.EventExit: if int(ei.Pid) == c.Pid { c.Lock() _, _, err := daemon.containerd.DeleteTask(context.Background(), c.ID) if err != nil { logrus.WithError(err).Warnf("failed to delete container %s from containerd", c.ID) } c.StreamConfig.Wait() c.Reset(false) exitStatus := container.ExitStatus{ ExitCode: int(ei.ExitCode), ExitedAt: ei.ExitedAt, OOMKilled: ei.OOMKilled, } restart, wait, err := c.RestartManager().ShouldRestart(ei.ExitCode, daemon.IsShuttingDown() || c.HasBeenManuallyStopped, time.Since(c.StartedAt)) if err == nil && restart { c.RestartCount++ c.SetRestarting(&exitStatus) } else { if ei.Error != nil { c.SetError(ei.Error) } c.SetStopped(&exitStatus) defer daemon.autoRemove(c) } defer c.Unlock() // needs to be called before autoRemove // cancel healthcheck here, they will be automatically // restarted if/when the container is started again daemon.stopHealthchecks(c) attributes := map[string]string{ "exitCode": strconv.Itoa(int(ei.ExitCode)), } daemon.LogContainerEventWithAttributes(c, "die", attributes) daemon.Cleanup(c) if err == nil && restart { go func() { err := <-wait if err == nil { // daemon.netController is initialized when daemon is restoring containers. // But containerStart will use daemon.netController segment. // So to avoid panic at startup process, here must wait util daemon restore done. daemon.waitForStartupDone() if err = daemon.containerStart(c, "", "", false); err != nil { logrus.Debugf("failed to restart container: %+v", err) } } if err != nil { c.Lock() c.SetStopped(&exitStatus) c.Unlock() defer daemon.autoRemove(c) if err != restartmanager.ErrRestartCanceled { logrus.Errorf("restartmanger wait error: %+v", err) } } }() } daemon.setStateCounter(c) if err := c.CheckpointTo(daemon.containersReplica); err != nil { return err } return daemon.postRunProcessing(c, ei) } if execConfig := c.ExecCommands.Get(ei.ProcessID); execConfig != nil { ec := int(ei.ExitCode) execConfig.Lock() defer execConfig.Unlock() execConfig.ExitCode = &ec execConfig.Running = false execConfig.StreamConfig.Wait() if err := execConfig.CloseStreams(); err != nil { logrus.Errorf("failed to cleanup exec %s streams: %s", c.ID, err) } // remove the exec command from the container's store only and not the // daemon's store so that the exec command can be inspected. c.ExecCommands.Delete(execConfig.ID, execConfig.Pid) attributes := map[string]string{ "execID": execConfig.ID, "exitCode": strconv.Itoa(ec), } daemon.LogContainerEventWithAttributes(c, "exec_die", attributes) } else { logrus.WithFields(logrus.Fields{ "container": c.ID, "exec-id": ei.ProcessID, "exec-pid": ei.Pid, }).Warnf("Ignoring Exit Event, no such exec command found") } case libcontainerd.EventStart: c.Lock() defer c.Unlock() // This is here to handle start not generated by docker if !c.Running { c.SetRunning(int(ei.Pid), false) c.HasBeenManuallyStopped = false c.HasBeenStartedBefore = true daemon.setStateCounter(c) daemon.initHealthMonitor(c) if err := c.CheckpointTo(daemon.containersReplica); err != nil { return err } daemon.LogContainerEvent(c, "start") } case libcontainerd.EventPaused: c.Lock() defer c.Unlock() if !c.Paused { c.Paused = true daemon.setStateCounter(c) daemon.updateHealthMonitor(c) if err := c.CheckpointTo(daemon.containersReplica); err != nil { return err } daemon.LogContainerEvent(c, "pause") } case libcontainerd.EventResumed: c.Lock() defer c.Unlock() if c.Paused { c.Paused = false daemon.setStateCounter(c) daemon.updateHealthMonitor(c) if err := c.CheckpointTo(daemon.containersReplica); err != nil { return err } daemon.LogContainerEvent(c, "unpause") } } return nil } func (daemon *Daemon) autoRemove(c *container.Container) { c.Lock() ar := c.HostConfig.AutoRemove c.Unlock() if !ar { return } var err error if err = daemon.ContainerRm(c.ID, &types.ContainerRmConfig{ForceRemove: true, RemoveVolume: true}); err == nil { return } if c := daemon.containers.Get(c.ID); c == nil { return } if err != nil { logrus.WithError(err).WithField("container", c.ID).Error("error removing container") } }