Golang links.NewLink函數代碼示例

func (container *Container) setupLinkedContainers() ([]string, error) {
	var (
		env     []string
		runtime = container.runtime
	)
	children, err := runtime.Children(container.Name)
	if err != nil {
		return nil, err
	}

	if len(children) > 0 {
		container.activeLinks = make(map[string]*links.Link, len(children))

		// If we encounter an error make sure that we rollback any network
		// config and ip table changes
		rollback := func() {
			for _, link := range container.activeLinks {
				link.Disable()
			}
			container.activeLinks = nil
		}

		for linkAlias, child := range children {
			if !child.State.IsRunning() {
				return nil, fmt.Errorf("Cannot link to a non running container: %s AS %s", child.Name, linkAlias)
			}

			link, err := links.NewLink(
				container.NetworkSettings.IPAddress,
				child.NetworkSettings.IPAddress,
				linkAlias,
				child.Config.Env,
				child.Config.ExposedPorts,
				runtime.eng)

			if err != nil {
				rollback()
				return nil, err
			}

			container.activeLinks[link.Alias()] = link
			if err := link.Enable(); err != nil {
				rollback()
				return nil, err
			}

			for _, envVar := range link.ToEnv() {
				env = append(env, envVar)
			}
		}
	}
	return env, nil
}

func (container *Container) Start() (err error) {
	container.Lock()
	defer container.Unlock()

	if container.State.IsRunning() {
		return fmt.Errorf("The container %s is already running.", container.ID)
	}

	defer func() {
		if err != nil {
			container.cleanup()
		}
	}()

	if err := container.Mount(); err != nil {
		return err
	}

	if container.runtime.config.DisableNetwork {
		container.Config.NetworkDisabled = true
		container.buildHostnameAndHostsFiles("127.0.1.1")
	} else {
		if err := container.allocateNetwork(); err != nil {
			return err
		}
		container.buildHostnameAndHostsFiles(container.NetworkSettings.IPAddress)
	}

	// Make sure the config is compatible with the current kernel
	if container.Config.Memory > 0 && !container.runtime.sysInfo.MemoryLimit {
		log.Printf("WARNING: Your kernel does not support memory limit capabilities. Limitation discarded.\n")
		container.Config.Memory = 0
	}
	if container.Config.Memory > 0 && !container.runtime.sysInfo.SwapLimit {
		log.Printf("WARNING: Your kernel does not support swap limit capabilities. Limitation discarded.\n")
		container.Config.MemorySwap = -1
	}

	if container.runtime.sysInfo.IPv4ForwardingDisabled {
		log.Printf("WARNING: IPv4 forwarding is disabled. Networking will not work")
	}

	if err := prepareVolumesForContainer(container); err != nil {
		return err
	}

	// Setup environment
	env := []string{
		"HOME=/",
		"PATH=" + DefaultPathEnv,
		"HOSTNAME=" + container.Config.Hostname,
	}

	if container.Config.Tty {
		env = append(env, "TERM=xterm")
	}

	// Init any links between the parent and children
	runtime := container.runtime

	children, err := runtime.Children(container.Name)
	if err != nil {
		return err
	}

	if len(children) > 0 {
		container.activeLinks = make(map[string]*links.Link, len(children))

		// If we encounter an error make sure that we rollback any network
		// config and ip table changes
		rollback := func() {
			for _, link := range container.activeLinks {
				link.Disable()
			}
			container.activeLinks = nil
		}

		for linkAlias, child := range children {
			if !child.State.IsRunning() {
				return fmt.Errorf("Cannot link to a non running container: %s AS %s", child.Name, linkAlias)
			}

			link, err := links.NewLink(
				container.NetworkSettings.IPAddress,
				child.NetworkSettings.IPAddress,
				linkAlias,
				child.Config.Env,
				child.Config.ExposedPorts,
				runtime.eng)

			if err != nil {
				rollback()
				return err
			}

			container.activeLinks[link.Alias()] = link
			if err := link.Enable(); err != nil {
				rollback()
				return err
			}
//.........這裏部分代碼省略.........