Ejemplo n.º 1
0
func daemon(context *cli.Context) error {
	// setup a standard reaper so that we don't leave any zombies if we are still alive
	// this is just good practice because we are spawning new processes
	s := make(chan os.Signal, 2048)
	signal.Notify(s, syscall.SIGCHLD, syscall.SIGTERM, syscall.SIGINT)
	if err := osutils.SetSubreaper(1); err != nil {
		logrus.WithField("error", err).Error("containerd: set subpreaper")
	}
	sv, err := supervisor.New(
		context.String("state-dir"),
		context.String("runtime"),
		context.String("shim"),
		context.StringSlice("runtime-args"),
		context.Duration("start-timeout"),
		context.Int("retain-count"))
	if err != nil {
		return err
	}
	wg := &sync.WaitGroup{}
	for i := 0; i < 10; i++ {
		wg.Add(1)
		w := supervisor.NewWorker(sv, wg)
		go w.Start()
	}
	if err := sv.Start(); err != nil {
		return err
	}
	// Split the listen string of the form proto://addr
	listenSpec := context.String("listen")
	listenParts := strings.SplitN(listenSpec, "://", 2)
	if len(listenParts) != 2 {
		return fmt.Errorf("bad listen address format %s, expected proto://address", listenSpec)
	}
	server, err := startServer(listenParts[0], listenParts[1], sv)
	if err != nil {
		return err
	}
	for ss := range s {
		switch ss {
		case syscall.SIGCHLD:
			if _, err := osutils.Reap(); err != nil {
				logrus.WithField("error", err).Warn("containerd: reap child processes")
			}
		default:
			logrus.Infof("stopping containerd after receiving %s", ss)
			server.Stop()
			os.Exit(0)
		}
	}
	return nil
}
Ejemplo n.º 2
0
func daemon(context *cli.Context) error {
	s := make(chan os.Signal, 2048)
	signal.Notify(s, syscall.SIGTERM, syscall.SIGINT)
	osutils.SetSubreaper(1)
	sv, err := supervisor.New(
		context.String("state-dir"),
		context.String("runtime"),
		context.String("shim"),
		context.StringSlice("runtime-args"),
		context.Duration("start-timeout"),
		context.Int("retain-count"))
	if err != nil {
		return err
	}
	wg := &sync.WaitGroup{}
	for i := 0; i < 10; i++ {
		wg.Add(1)
		w := supervisor.NewWorker(sv, wg)
		go w.Start()
	}
	if err := sv.Start(); err != nil {
		return err
	}
	// Split the listen string of the form proto://addr
	listenSpec := context.String("listen")
	listenParts := strings.SplitN(listenSpec, "://", 2)
	if len(listenParts) != 2 {
		return fmt.Errorf("bad listen address format %s, expected proto://address", listenSpec)
	}
	server, err := startServer(listenParts[0], listenParts[1], sv)
	if err != nil {
		return err
	}
	for ss := range s {
		switch ss {
		default:
			logrus.Infof("stopping containerd after receiving %s", ss)
			server.Stop()
			os.Exit(0)
		}
	}
	return nil
}
Ejemplo n.º 3
0
func daemon(address, stateDir string, concurrency int, runtimeName string, runtimeArgs []string, shimName string, timeout time.Duration) error {
	// setup a standard reaper so that we don't leave any zombies if we are still alive
	// this is just good practice because we are spawning new processes
	s := make(chan os.Signal, 2048)
	signal.Notify(s, syscall.SIGCHLD, syscall.SIGTERM, syscall.SIGINT)
	if err := osutils.SetSubreaper(1); err != nil {
		logrus.WithField("error", err).Error("containerd: set subpreaper")
	}
	sv, err := supervisor.New(stateDir, runtimeName, shimName, runtimeArgs, timeout)
	if err != nil {
		return err
	}
	wg := &sync.WaitGroup{}
	for i := 0; i < concurrency; i++ {
		wg.Add(1)
		w := supervisor.NewWorker(sv, wg)
		go w.Start()
	}
	if err := sv.Start(); err != nil {
		return err
	}
	server, err := startServer(address, sv)
	if err != nil {
		return err
	}
	for ss := range s {
		switch ss {
		case syscall.SIGCHLD:
			if _, err := osutils.Reap(); err != nil {
				logrus.WithField("error", err).Warn("containerd: reap child processes")
			}
		default:
			logrus.Infof("stopping containerd after receiving %s", ss)
			server.Stop()
			os.Exit(0)
		}
	}
	return nil
}
Ejemplo n.º 4
0
func start(log *os.File) error {
	// start handling signals as soon as possible so that things are properly reaped
	// or if runtime exits before we hit the handler
	signals := make(chan os.Signal, 2048)
	signal.Notify(signals)
	// set the shim as the subreaper for all orphaned processes created by the container
	if err := osutils.SetSubreaper(1); err != nil {
		return err
	}
	// open the exit pipe
	f, err := os.OpenFile("exit", syscall.O_WRONLY, 0)
	if err != nil {
		return err
	}
	defer f.Close()
	control, err := os.OpenFile("control", syscall.O_RDWR, 0)
	if err != nil {
		return err
	}
	defer control.Close()
	p, err := newProcess(flag.Arg(0), flag.Arg(1), flag.Arg(2))
	if err != nil {
		return err
	}
	defer func() {
		if err := p.Close(); err != nil {
			writeMessage(log, "warn", err)
		}
	}()
	if err := p.create(); err != nil {
		p.delete()
		return err
	}
	msgC := make(chan controlMessage, 32)
	go func() {
		for {
			var m controlMessage
			if _, err := fmt.Fscanf(control, "%d %d %d\n", &m.Type, &m.Width, &m.Height); err != nil {
				continue
			}
			msgC <- m
		}
	}()
	var exitShim bool
	for {
		select {
		case s := <-signals:
			switch s {
			case syscall.SIGCHLD:
				exits, _ := osutils.Reap()
				for _, e := range exits {
					// check to see if runtime is one of the processes that has exited
					if e.Pid == p.pid() {
						exitShim = true
						writeInt("exitStatus", e.Status)
					}
				}
			}
			// runtime has exited so the shim can also exit
			if exitShim {
				// Let containerd take care of calling the runtime delete
				f.Close()
				p.Wait()
				return nil
			}
		case msg := <-msgC:
			switch msg.Type {
			case 0:
				// close stdin
				if p.stdinCloser != nil {
					p.stdinCloser.Close()
				}
			case 1:
				if p.console == nil {
					continue
				}
				ws := term.Winsize{
					Width:  uint16(msg.Width),
					Height: uint16(msg.Height),
				}
				term.SetWinsize(p.console.Fd(), &ws)
			}
		}
	}
	return nil
}