Golang exec.SyncServices函数代码示例

func (d *ExecDriver) Open(ctx *ExecContext, handleID string) (DriverHandle, error) {
	id := &execId{}
	if err := json.Unmarshal([]byte(handleID), id); err != nil {
		return nil, fmt.Errorf("Failed to parse handle '%s': %v", handleID, err)
	}

	pluginConfig := &plugin.ClientConfig{
		Reattach: id.PluginConfig.PluginConfig(),
	}
	exec, client, err := createExecutor(pluginConfig, d.config.LogOutput, d.config)
	if err != nil {
		merrs := new(multierror.Error)
		merrs.Errors = append(merrs.Errors, err)
		d.logger.Println("[ERR] driver.exec: error connecting to plugin so destroying plugin pid and user pid")
		if e := destroyPlugin(id.PluginConfig.Pid, id.UserPid); e != nil {
			merrs.Errors = append(merrs.Errors, fmt.Errorf("error destroying plugin and userpid: %v", e))
		}
		if id.IsolationConfig != nil {
			isoConf := id.IsolationConfig
			ePid := pluginConfig.Reattach.Pid
			if e := executor.DestroyCgroup(isoConf.Cgroup, isoConf.CgroupPaths, ePid); e != nil {
				merrs.Errors = append(merrs.Errors, fmt.Errorf("destroying cgroup failed: %v", e))
			}
		}
		if e := ctx.AllocDir.UnmountAll(); e != nil {
			merrs.Errors = append(merrs.Errors, e)
		}
		return nil, fmt.Errorf("error connecting to plugin: %v", merrs.ErrorOrNil())
	}

	ver, _ := exec.Version()
	d.logger.Printf("[DEBUG] driver.exec : version of executor: %v", ver.Version)
	// Return a driver handle
	h := &execHandle{
		pluginClient:    client,
		executor:        exec,
		userPid:         id.UserPid,
		allocDir:        id.AllocDir,
		isolationConfig: id.IsolationConfig,
		logger:          d.logger,
		version:         id.Version,
		killTimeout:     id.KillTimeout,
		maxKillTimeout:  id.MaxKillTimeout,
		doneCh:          make(chan struct{}),
		waitCh:          make(chan *cstructs.WaitResult, 1),
	}
	if err := exec.SyncServices(consulContext(d.config, "")); err != nil {
		d.logger.Printf("[ERR] driver.exec: error registering services with consul: %v", err)
	}
	go h.run()
	return h, nil
}

func (d *DockerDriver) Open(ctx *ExecContext, handleID string) (DriverHandle, error) {
	cleanupImage := d.config.ReadBoolDefault("docker.cleanup.image", true)

	// Split the handle
	pidBytes := []byte(strings.TrimPrefix(handleID, "DOCKER:"))
	pid := &dockerPID{}
	if err := json.Unmarshal(pidBytes, pid); err != nil {
		return nil, fmt.Errorf("Failed to parse handle '%s': %v", handleID, err)
	}
	d.logger.Printf("[INFO] driver.docker: re-attaching to docker process: %s", pid.ContainerID)
	d.logger.Printf("[DEBUG] driver.docker: re-attached to handle: %s", handleID)
	pluginConfig := &plugin.ClientConfig{
		Reattach: pid.PluginConfig.PluginConfig(),
	}

	client, waitClient, err := d.dockerClients()
	if err != nil {
		return nil, fmt.Errorf("Failed to connect to docker daemon: %s", err)
	}

	// Look for a running container with this ID
	containers, err := client.ListContainers(docker.ListContainersOptions{
		Filters: map[string][]string{
			"id": []string{pid.ContainerID},
		},
	})
	if err != nil {
		return nil, fmt.Errorf("Failed to query for container %s: %v", pid.ContainerID, err)
	}

	found := false
	for _, container := range containers {
		if container.ID == pid.ContainerID {
			found = true
		}
	}
	if !found {
		return nil, fmt.Errorf("Failed to find container %s: %v", pid.ContainerID, err)
	}
	exec, pluginClient, err := createExecutor(pluginConfig, d.config.LogOutput, d.config)
	if err != nil {
		d.logger.Printf("[INFO] driver.docker: couldn't re-attach to the plugin process: %v", err)
		if e := client.StopContainer(pid.ContainerID, uint(pid.KillTimeout*time.Second)); e != nil {
			d.logger.Printf("[DEBUG] driver.docker: couldn't stop container: %v", e)
		}
		return nil, err
	}

	ver, _ := exec.Version()
	d.logger.Printf("[DEBUG] driver.docker: version of executor: %v", ver.Version)

	// Return a driver handle
	h := &DockerHandle{
		client:         client,
		waitClient:     waitClient,
		executor:       exec,
		pluginClient:   pluginClient,
		cleanupImage:   cleanupImage,
		logger:         d.logger,
		imageID:        pid.ImageID,
		containerID:    pid.ContainerID,
		version:        pid.Version,
		killTimeout:    pid.KillTimeout,
		maxKillTimeout: pid.MaxKillTimeout,
		doneCh:         make(chan bool),
		waitCh:         make(chan *dstructs.WaitResult, 1),
	}
	if err := exec.SyncServices(consulContext(d.config, pid.ContainerID)); err != nil {
		h.logger.Printf("[ERR] driver.docker: error registering services with consul: %v", err)
	}

	go h.collectStats()
	go h.run()
	return h, nil
}

//.........这里部分代码省略.........
	ss, err := exec.LaunchSyslogServer(executorCtx)
	if err != nil {
		return nil, fmt.Errorf("failed to start syslog collector: %v", err)
	}

	config, err := d.createContainer(ctx, task, &driverConfig, ss.Addr)
	if err != nil {
		d.logger.Printf("[ERR] driver.docker: failed to create container configuration for image %s: %s", image, err)
		pluginClient.Kill()
		return nil, fmt.Errorf("Failed to create container configuration for image %s: %s", image, err)
	}
	// Create a container
	container, err := client.CreateContainer(config)
	if err != nil {
		// If the container already exists because of a previous failure we'll
		// try to purge it and re-create it.
		if strings.Contains(err.Error(), "container already exists") {
			// Get the ID of the existing container so we can delete it
			containers, err := client.ListContainers(docker.ListContainersOptions{
				// The image might be in use by a stopped container, so check everything
				All: true,
				Filters: map[string][]string{
					"name": []string{config.Name},
				},
			})
			if err != nil {
				d.logger.Printf("[ERR] driver.docker: failed to query list of containers matching name:%s", config.Name)
				pluginClient.Kill()
				return nil, fmt.Errorf("Failed to query list of containers: %s", err)
			}

			// Couldn't find any matching containers
			if len(containers) == 0 {
				d.logger.Printf("[ERR] driver.docker: failed to get id for container %s: %#v", config.Name, containers)
				pluginClient.Kill()
				return nil, fmt.Errorf("Failed to get id for container %s", config.Name)
			}

			// Delete matching containers
			d.logger.Printf("[INFO] driver.docker: a container with the name %s already exists; will attempt to purge and re-create", config.Name)
			for _, container := range containers {
				err = client.RemoveContainer(docker.RemoveContainerOptions{
					ID: container.ID,
				})
				if err != nil {
					d.logger.Printf("[ERR] driver.docker: failed to purge container %s", container.ID)
					pluginClient.Kill()
					return nil, fmt.Errorf("Failed to purge container %s: %s", container.ID, err)
				}
				d.logger.Printf("[INFO] driver.docker: purged container %s", container.ID)
			}

			container, err = client.CreateContainer(config)
			if err != nil {
				d.logger.Printf("[ERR] driver.docker: failed to re-create container %s; aborting", config.Name)
				pluginClient.Kill()
				return nil, fmt.Errorf("Failed to re-create container %s; aborting", config.Name)
			}
		} else {
			// We failed to create the container for some other reason.
			d.logger.Printf("[ERR] driver.docker: failed to create container from image %s: %s", image, err)
			pluginClient.Kill()
			return nil, fmt.Errorf("Failed to create container from image %s: %s", image, err)
		}
	}
	d.logger.Printf("[INFO] driver.docker: created container %s", container.ID)

	// Start the container
	err = client.StartContainer(container.ID, container.HostConfig)
	if err != nil {
		d.logger.Printf("[ERR] driver.docker: failed to start container %s: %s", container.ID, err)
		pluginClient.Kill()
		return nil, fmt.Errorf("Failed to start container %s: %s", container.ID, err)
	}
	d.logger.Printf("[INFO] driver.docker: started container %s", container.ID)

	// Return a driver handle
	maxKill := d.DriverContext.config.MaxKillTimeout
	h := &DockerHandle{
		client:         client,
		waitClient:     waitClient,
		executor:       exec,
		pluginClient:   pluginClient,
		cleanupImage:   cleanupImage,
		logger:         d.logger,
		imageID:        dockerImage.ID,
		containerID:    container.ID,
		version:        d.config.Version,
		killTimeout:    GetKillTimeout(task.KillTimeout, maxKill),
		maxKillTimeout: maxKill,
		doneCh:         make(chan bool),
		waitCh:         make(chan *dstructs.WaitResult, 1),
	}
	if err := exec.SyncServices(consulContext(d.config, container.ID)); err != nil {
		d.logger.Printf("[ERR] driver.docker: error registering services with consul for task: %q: %v", task.Name, err)
	}
	go h.collectStats()
	go h.run()
	return h, nil
}

func (d *ExecDriver) Start(ctx *ExecContext, task *structs.Task) (DriverHandle, error) {
	var driverConfig ExecDriverConfig
	if err := mapstructure.WeakDecode(task.Config, &driverConfig); err != nil {
		return nil, err
	}

	// Get the command to be ran
	command := driverConfig.Command
	if err := validateCommand(command, "args"); err != nil {
		return nil, err
	}

	// Set the host environment variables.
	filter := strings.Split(d.config.ReadDefault("env.blacklist", config.DefaultEnvBlacklist), ",")
	d.taskEnv.AppendHostEnvvars(filter)

	// Get the task directory for storing the executor logs.
	taskDir, ok := ctx.AllocDir.TaskDirs[d.DriverContext.taskName]
	if !ok {
		return nil, fmt.Errorf("Could not find task directory for task: %v", d.DriverContext.taskName)
	}

	bin, err := discover.NomadExecutable()
	if err != nil {
		return nil, fmt.Errorf("unable to find the nomad binary: %v", err)
	}
	pluginLogFile := filepath.Join(taskDir, fmt.Sprintf("%s-executor.out", task.Name))
	pluginConfig := &plugin.ClientConfig{
		Cmd: exec.Command(bin, "executor", pluginLogFile),
	}

	exec, pluginClient, err := createExecutor(pluginConfig, d.config.LogOutput, d.config)
	if err != nil {
		return nil, err
	}
	executorCtx := &executor.ExecutorContext{
		TaskEnv:  d.taskEnv,
		Driver:   "exec",
		AllocDir: ctx.AllocDir,
		AllocID:  ctx.AllocID,
		Task:     task,
	}

	ps, err := exec.LaunchCmd(&executor.ExecCommand{
		Cmd:            command,
		Args:           driverConfig.Args,
		FSIsolation:    true,
		ResourceLimits: true,
		User:           getExecutorUser(task),
	}, executorCtx)
	if err != nil {
		pluginClient.Kill()
		return nil, err
	}
	d.logger.Printf("[DEBUG] driver.exec: started process via plugin with pid: %v", ps.Pid)

	// Return a driver handle
	maxKill := d.DriverContext.config.MaxKillTimeout
	h := &execHandle{
		pluginClient:    pluginClient,
		userPid:         ps.Pid,
		executor:        exec,
		allocDir:        ctx.AllocDir,
		isolationConfig: ps.IsolationConfig,
		killTimeout:     GetKillTimeout(task.KillTimeout, maxKill),
		maxKillTimeout:  maxKill,
		logger:          d.logger,
		version:         d.config.Version,
		doneCh:          make(chan struct{}),
		waitCh:          make(chan *cstructs.WaitResult, 1),
	}
	if err := exec.SyncServices(consulContext(d.config, "")); err != nil {
		d.logger.Printf("[ERR] driver.exec: error registering services with consul for task: %q: %v", task.Name, err)
	}
	go h.run()
	return h, nil
}

//.........这里部分代码省略.........

	bin, err := discover.NomadExecutable()
	if err != nil {
		return nil, fmt.Errorf("unable to find the nomad binary: %v", err)
	}
	pluginLogFile := filepath.Join(taskDir, fmt.Sprintf("%s-executor.out", task.Name))
	pluginConfig := &plugin.ClientConfig{
		Cmd: exec.Command(bin, "executor", pluginLogFile),
	}

	exec, pluginClient, err := createExecutor(pluginConfig, d.config.LogOutput, d.config)
	if err != nil {
		return nil, err
	}
	executorCtx := &executor.ExecutorContext{
		TaskEnv:        d.taskEnv,
		Task:           task,
		Driver:         "docker",
		AllocDir:       ctx.AllocDir,
		AllocID:        ctx.AllocID,
		PortLowerBound: d.config.ClientMinPort,
		PortUpperBound: d.config.ClientMaxPort,
	}
	if err := exec.SetContext(executorCtx); err != nil {
		pluginClient.Kill()
		return nil, fmt.Errorf("failed to set executor context: %v", err)
	}

	// Only launch syslog server if we're going to use it!
	syslogAddr := ""
	if runtime.GOOS == "darwin" && len(driverConfig.Logging) == 0 {
		d.logger.Printf("[DEBUG] driver.docker: disabling syslog driver as Docker for Mac workaround")
	} else if len(driverConfig.Logging) == 0 || driverConfig.Logging[0].Type == "syslog" {
		ss, err := exec.LaunchSyslogServer()
		if err != nil {
			pluginClient.Kill()
			return nil, fmt.Errorf("failed to start syslog collector: %v", err)
		}
		syslogAddr = ss.Addr
	}

	config, err := d.createContainerConfig(ctx, task, driverConfig, syslogAddr)
	if err != nil {
		d.logger.Printf("[ERR] driver.docker: failed to create container configuration for image %s: %s", image, err)
		pluginClient.Kill()
		return nil, fmt.Errorf("Failed to create container configuration for image %s: %s", image, err)
	}

	container, rerr := d.createContainer(config)
	if rerr != nil {
		d.logger.Printf("[ERR] driver.docker: failed to create container: %s", rerr)
		pluginClient.Kill()
		rerr.Err = fmt.Sprintf("Failed to create container: %s", rerr.Err)
		return nil, rerr
	}

	d.logger.Printf("[INFO] driver.docker: created container %s", container.ID)

	// We don't need to start the container if the container is already running
	// since we don't create containers which are already present on the host
	// and are running
	if !container.State.Running {
		// Start the container
		err := d.startContainer(container)
		if err != nil {
			d.logger.Printf("[ERR] driver.docker: failed to start container %s: %s", container.ID, err)
			pluginClient.Kill()
			err.Err = fmt.Sprintf("Failed to start container %s: %s", container.ID, err)
			return nil, err
		}
		d.logger.Printf("[INFO] driver.docker: started container %s", container.ID)
	} else {
		d.logger.Printf("[DEBUG] driver.docker: re-attaching to container %s with status %q",
			container.ID, container.State.String())
	}

	// Return a driver handle
	maxKill := d.DriverContext.config.MaxKillTimeout
	h := &DockerHandle{
		client:         client,
		waitClient:     waitClient,
		executor:       exec,
		pluginClient:   pluginClient,
		cleanupImage:   cleanupImage,
		logger:         d.logger,
		imageID:        dockerImage.ID,
		containerID:    container.ID,
		version:        d.config.Version,
		killTimeout:    GetKillTimeout(task.KillTimeout, maxKill),
		maxKillTimeout: maxKill,
		doneCh:         make(chan bool),
		waitCh:         make(chan *dstructs.WaitResult, 1),
	}
	if err := exec.SyncServices(consulContext(d.config, container.ID)); err != nil {
		d.logger.Printf("[ERR] driver.docker: error registering services with consul for task: %q: %v", task.Name, err)
	}
	go h.collectStats()
	go h.run()
	return h, nil
}