// 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)
// FIXME: if the container is supposed to be running but is not, auto restart it?
// if so, then we need to restart monitor and init a new lock
// If the container is supposed to be running, make sure of it
if container.IsRunning() {
log.Debugf("killing old running container %s", container.ID)
existingPid := container.Pid
container.SetStopped(&execdriver.ExitStatus{ExitCode: 0})
// We only have to handle this for lxc because the other drivers will ensure that
// no processes are left when docker dies
if container.ExecDriver == "" || strings.Contains(container.ExecDriver, "lxc") {
lxc.KillLxc(container.ID, 9)
} else {
// use the current driver and ensure that the container is dead x.x
cmd := &execdriver.Command{
ID: container.ID,
}
var err error
cmd.ProcessConfig.Process, err = os.FindProcess(existingPid)
if err != nil {
log.Debugf("cannot find existing process for %d", existingPid)
}
daemon.execDriver.Terminate(cmd)
}
if err := container.Unmount(); err != nil {
log.Debugf("unmount error %s", err)
}
if err := container.ToDisk(); err != nil {
log.Debugf("saving stopped state to disk %s", err)
}
info := daemon.execDriver.Info(container.ID)
if !info.IsRunning() {
log.Debugf("Container %s was supposed to be running but is not.", container.ID)
log.Debugf("Marking as stopped")
container.SetStopped(&execdriver.ExitStatus{ExitCode: -127})
if err := container.ToDisk(); err != nil {
return err
}
}
}
return nil
}
// 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)
// FIXME: if the container is supposed to be running but is not, auto restart it?
// if so, then we need to restart monitor and init a new lock
// If the container is supposed to be running, make sure of it
if container.IsRunning() {
if container.MonitorDriver == MonitorBuiltin {
log.Debugf("killing old running container %s", container.ID)
existingPid := container.Pid
container.SetStopped(0)
// We only have to handle this for lxc because the other drivers will ensure that
// no processes are left when docker dies
if container.ExecDriver == "" || strings.Contains(container.ExecDriver, "lxc") {
lxc.KillLxc(container.ID, 9)
} else {
// use the current driver and ensure that the container is dead x.x
cmd := &execdriver.Command{
ID: container.ID,
}
var err error
cmd.ProcessConfig.Process, err = os.FindProcess(existingPid)
if err != nil {
log.Debugf("cannot find existing process for %d", existingPid)
}
daemon.execDriver.Terminate(cmd)
}
if err := container.Unmount(); err != nil {
log.Debugf("unmount error %s", err)
}
if err := container.ToDisk(); err != nil {
log.Debugf("saving stopped state to disk %s", err)
}
info := daemon.execDriver.Info(container.ID)
if !info.IsRunning() {
log.Debugf("Container %s was supposed to be running but is not.", container.ID)
log.Debugf("Marking as stopped")
container.SetStopped(-127)
if err := container.ToDisk(); err != nil {
return err
}
}
} else {
// restore external container
log.Debugf("restore external container: %s", container.ID)
_, err := container.daemon.callMonitorAPI(container, "GET", "_ping")
if err != nil {
log.Errorf("Call monitor _ping API failed: %v, mark container %s stopped", err, container.ID)
// Think monitor is down, mark container is down
container.SetStopped(-125)
if err := container.ToDisk(); err != nil {
return err
}
} else {
obj, err := container.daemon.callMonitorAPI(container, "GET", "state")
if err != nil {
log.Errorf("Call monitor state API failed: %v", err)
return err
}
m := make(map[string]*WatchState)
if err = json.Unmarshal(obj, &m); err != nil {
log.Errorf("Decode WatchState error: %v", err)
return err
}
ws := m["WatchState"]
log.Debugf("WatchState %v", ws)
if !ws.Running {
log.Errorf("Container %s is supposed be running, but not running in monitor, mark it stopped", container.ID)
container.SetStopped(-125)
if err = container.ToDisk(); err != nil {
return err
}
// kill monitor server
if err = syscall.Kill(container.monitorState.Pid, syscall.SIGTERM); err != nil {
log.Errorf("kill monitor server with pid %v error: %v", container.monitorState.Pid, err)
return err
}
// write monitor state
container.monitorState.SetStopped(0)
if err = container.WriteMonitorState(); err != nil {
log.Errorf("write monitor state error: %v", err)
return err
}
} else { // external container is running
// register to graph driver
if err := container.daemon.driver.Register(container.ID); err != nil {
log.Errorf("register container to graph driver error: %v", err)
}
monitor := NewMonitorProxy(container, false)
container.exMonitor = monitor
if err := monitor.RunStatePoller(); err != nil {
log.Errorf("Container %s run StatePoll failed: %v", container.ID, err)
return err
}
}
}
}
}
return nil
}