Ejemplo n.º 1
0
// CmdPort lists port mappings for a container.
// If a private port is specified, it also shows the public-facing port that is NATed to the private port.
//
// Usage: docker port CONTAINER [PRIVATE_PORT[/PROTO]]
func (cli *DockerCli) CmdPort(args ...string) error {
	cmd := cli.Subcmd("port", "CONTAINER [PRIVATE_PORT[/PROTO]]", "List port mappings for the CONTAINER, or lookup the public-facing port that\nis NAT-ed to the PRIVATE_PORT", true)
	cmd.Require(flag.Min, 1)
	utils.ParseFlags(cmd, args, true)

	stream, _, err := cli.call("GET", "/containers/"+cmd.Arg(0)+"/json", nil, nil)
	if err != nil {
		return err
	}

	env := engine.Env{}
	if err := env.Decode(stream); err != nil {
		return err
	}
	ports := nat.PortMap{}
	if err := env.GetSubEnv("NetworkSettings").GetJson("Ports", &ports); err != nil {
		return err
	}

	if cmd.NArg() == 2 {
		var (
			port  = cmd.Arg(1)
			proto = "tcp"
			parts = strings.SplitN(port, "/", 2)
		)

		if len(parts) == 2 && len(parts[1]) != 0 {
			port = parts[0]
			proto = parts[1]
		}
		natPort := port + "/" + proto
		if frontends, exists := ports[nat.Port(port+"/"+proto)]; exists && frontends != nil {
			for _, frontend := range frontends {
				fmt.Fprintf(cli.out, "%s:%s\n", frontend.HostIp, frontend.HostPort)
			}
			return nil
		}
		return fmt.Errorf("Error: No public port '%s' published for %s", natPort, cmd.Arg(0))
	}

	for from, frontends := range ports {
		for _, frontend := range frontends {
			fmt.Fprintf(cli.out, "%s -> %s:%s\n", from, frontend.HostIp, frontend.HostPort)
		}
	}

	return nil
}
Ejemplo n.º 2
0
// getExitCode perform an inspect on the container. It returns
// the running state and the exit code.
func getExitCode(cli *DockerCli, containerId string) (bool, int, error) {
	stream, _, err := cli.call("GET", "/containers/"+containerId+"/json", nil, false)
	if err != nil {
		// If we can't connect, then the daemon probably died.
		if err != ErrConnectionRefused {
			return false, -1, err
		}
		return false, -1, nil
	}

	var result engine.Env
	if err := result.Decode(stream); err != nil {
		return false, -1, err
	}

	state := result.GetSubEnv("State")
	return state.GetBool("Running"), state.GetInt("ExitCode"), nil
}
Ejemplo n.º 3
0
// CmdLogs fetches the logs of a given container.
//
// docker logs [OPTIONS] CONTAINER
func (cli *DockerCli) CmdLogs(args ...string) error {
	var (
		cmd    = cli.Subcmd("logs", "CONTAINER", "Fetch the logs of a container", true)
		follow = cmd.Bool([]string{"f", "-follow"}, false, "Follow log output")
		times  = cmd.Bool([]string{"t", "-timestamps"}, false, "Show timestamps")
		tail   = cmd.String([]string{"-tail"}, "all", "Number of lines to show from the end of the logs")
	)
	cmd.Require(flag.Exact, 1)

	utils.ParseFlags(cmd, args, true)

	name := cmd.Arg(0)

	stream, _, err := cli.call("GET", "/containers/"+name+"/json", nil, nil)
	if err != nil {
		return err
	}

	env := engine.Env{}
	if err := env.Decode(stream); err != nil {
		return err
	}

	if env.GetSubEnv("HostConfig").GetSubEnv("LogConfig").Get("Type") != "json-file" {
		return fmt.Errorf("\"logs\" command is supported only for \"json-file\" logging driver")
	}

	v := url.Values{}
	v.Set("stdout", "1")
	v.Set("stderr", "1")

	if *times {
		v.Set("timestamps", "1")
	}

	if *follow {
		v.Set("follow", "1")
	}
	v.Set("tail", *tail)

	return cli.streamHelper("GET", "/containers/"+name+"/logs?"+v.Encode(), env.GetSubEnv("Config").GetBool("Tty"), nil, cli.out, cli.err, nil)
}
Ejemplo n.º 4
0
// CmdAttach attaches to a running container.
//
// Usage: docker attach [OPTIONS] CONTAINER
func (cli *DockerCli) CmdAttach(args ...string) error {
	var (
		cmd     = cli.Subcmd("attach", "CONTAINER", "Attach to a running container", true)
		noStdin = cmd.Bool([]string{"#nostdin", "-no-stdin"}, false, "Do not attach STDIN")
		proxy   = cmd.Bool([]string{"#sig-proxy", "-sig-proxy"}, true, "Proxy all received signals to the process")
	)
	cmd.Require(flag.Exact, 1)

	utils.ParseFlags(cmd, args, true)
	name := cmd.Arg(0)

	stream, _, err := cli.call("GET", "/containers/"+name+"/json", nil, nil)
	if err != nil {
		return err
	}

	env := engine.Env{}
	if err := env.Decode(stream); err != nil {
		return err
	}

	if !env.GetSubEnv("State").GetBool("Running") {
		return fmt.Errorf("You cannot attach to a stopped container, start it first")
	}

	var (
		config = env.GetSubEnv("Config")
		tty    = config.GetBool("Tty")
	)

	if err := cli.CheckTtyInput(!*noStdin, tty); err != nil {
		return err
	}

	if tty && cli.isTerminalOut {
		if err := cli.monitorTtySize(cmd.Arg(0), false); err != nil {
			logrus.Debugf("Error monitoring TTY size: %s", err)
		}
	}

	var in io.ReadCloser

	v := url.Values{}
	v.Set("stream", "1")
	if !*noStdin && config.GetBool("OpenStdin") {
		v.Set("stdin", "1")
		in = cli.in
	}

	v.Set("stdout", "1")
	v.Set("stderr", "1")

	if *proxy && !tty {
		sigc := cli.forwardAllSignals(cmd.Arg(0))
		defer signal.StopCatch(sigc)
	}

	if err := cli.hijack("POST", "/containers/"+cmd.Arg(0)+"/attach?"+v.Encode(), tty, in, cli.out, cli.err, nil, nil); err != nil {
		return err
	}

	_, status, err := getExitCode(cli, cmd.Arg(0))
	if err != nil {
		return err
	}
	if status != 0 {
		return &utils.StatusError{StatusCode: status}
	}

	return nil
}
Ejemplo n.º 5
0
// CmdStart starts one or more stopped containers.
//
// Usage: docker start [OPTIONS] CONTAINER [CONTAINER...]
func (cli *DockerCli) CmdStart(args ...string) error {
	var (
		cErr chan error
		tty  bool

		cmd       = cli.Subcmd("start", "CONTAINER [CONTAINER...]", "Start one or more stopped containers", true)
		attach    = cmd.Bool([]string{"a", "-attach"}, false, "Attach STDOUT/STDERR and forward signals")
		openStdin = cmd.Bool([]string{"i", "-interactive"}, false, "Attach container's STDIN")
	)

	cmd.Require(flag.Min, 1)
	cmd.ParseFlags(args, true)

	if *attach || *openStdin {
		if cmd.NArg() > 1 {
			return fmt.Errorf("You cannot start and attach multiple containers at once.")
		}

		stream, _, err := cli.call("GET", "/containers/"+cmd.Arg(0)+"/json", nil, nil)
		if err != nil {
			return err
		}

		env := engine.Env{}
		if err := env.Decode(stream); err != nil {
			return err
		}
		config := env.GetSubEnv("Config")
		tty = config.GetBool("Tty")

		if !tty {
			sigc := cli.forwardAllSignals(cmd.Arg(0))
			defer signal.StopCatch(sigc)
		}

		var in io.ReadCloser

		v := url.Values{}
		v.Set("stream", "1")

		if *openStdin && config.GetBool("OpenStdin") {
			v.Set("stdin", "1")
			in = cli.in
		}

		v.Set("stdout", "1")
		v.Set("stderr", "1")

		hijacked := make(chan io.Closer)
		// Block the return until the chan gets closed
		defer func() {
			logrus.Debugf("CmdStart() returned, defer waiting for hijack to finish.")
			if _, ok := <-hijacked; ok {
				logrus.Errorf("Hijack did not finish (chan still open)")
			}
			cli.in.Close()
		}()
		cErr = promise.Go(func() error {
			return cli.hijack("POST", "/containers/"+cmd.Arg(0)+"/attach?"+v.Encode(), tty, in, cli.out, cli.err, hijacked, nil)
		})

		// Acknowledge the hijack before starting
		select {
		case closer := <-hijacked:
			// Make sure that the hijack gets closed when returning (results
			// in closing the hijack chan and freeing server's goroutines)
			if closer != nil {
				defer closer.Close()
			}
		case err := <-cErr:
			if err != nil {
				return err
			}
		}
	}

	var encounteredError error
	for _, name := range cmd.Args() {
		_, _, err := readBody(cli.call("POST", "/containers/"+name+"/start", nil, nil))
		if err != nil {
			if !*attach && !*openStdin {
				// attach and openStdin is false means it could be starting multiple containers
				// when a container start failed, show the error message and start next
				fmt.Fprintf(cli.err, "%s\n", err)
				encounteredError = fmt.Errorf("Error: failed to start one or more containers")
			} else {
				encounteredError = err
			}
		} else {
			if !*attach && !*openStdin {
				fmt.Fprintf(cli.out, "%s\n", name)
			}
		}
	}

	if encounteredError != nil {
		return encounteredError
	}

	if *openStdin || *attach {
		if tty && cli.isTerminalOut {
			if err := cli.monitorTtySize(cmd.Arg(0), false); err != nil {
				logrus.Errorf("Error monitoring TTY size: %s", err)
			}
		}
		if attchErr := <-cErr; attchErr != nil {
			return attchErr
		}
		_, status, err := getExitCode(cli, cmd.Arg(0))
		if err != nil {
			return err
		}
		if status != 0 {
			return StatusError{StatusCode: status}
		}
	}
	return nil
}