Golang docker.Helper類代碼示例

// EnsureDocker attempts to connect to the Docker daemon defined by the helper,
// and if it is unable to it will print a warning.
func (c *NodeConfig) EnsureDocker(docker *dockerutil.Helper) {
	dockerClient, dockerAddr := docker.GetClientOrExit()
	if err := dockerClient.Ping(); err != nil {
		c.HandleDockerError(fmt.Sprintf("Docker could not be reached at %s.  Docker must be installed and running to start containers.\n%v", dockerAddr, err))
		return
	}

	glog.Infof("Connecting to Docker at %s", dockerAddr)

	env, err := dockerClient.Version()
	if err != nil {
		c.HandleDockerError(fmt.Sprintf("Unable to check for Docker server version.\n%v", err))
		return
	}

	serverVersionString := env.Get("ApiVersion")
	serverVersion, err := dockerclient.NewAPIVersion(serverVersionString)
	if err != nil {
		c.HandleDockerError(fmt.Sprintf("Unable to determine Docker server version from %q.\n%v", serverVersionString, err))
		return
	}

	minimumPullByIDVersion, err := dockerclient.NewAPIVersion(minimumDockerAPIVersionWithPullByID)
	if err != nil {
		c.HandleDockerError(fmt.Sprintf("Unable to check for Docker server version.\n%v", err))
		return
	}

	if serverVersion.LessThan(minimumPullByIDVersion) {
		c.HandleDockerError(fmt.Sprintf("Docker 1.6 or later (server API version 1.18 or later) required."))
		return
	}

	c.DockerClient = dockerClient
}

func tour(dockerHelper *docker.Helper) {
	cmd := os.Args[0]

	_, kubeClient := clients()

	// check Docker
	dockerClient, addr, err := dockerHelper.GetClient()
	if err != nil {
		fmt.Printf(tourDockerClientErr, addr, err)
		os.Exit(1)
	}
	if err := dockerClient.Ping(); err != nil {
		fmt.Printf(tourDockerPingErr, addr, err)
		//os.Exit(1)
		continueTour()
	}

	fmt.Printf(tourOne)
	continueTour()

	// check for server start
	if serverRunning(kubeClient) {
		fmt.Printf(tourOneRunning, defaultServerAddr)

	} else {
		fmt.Printf(tourOneStart, cmd)

		if err := wait.Poll(time.Second, maxWait, func() (bool, error) {
			return serverRunning(kubeClient), nil
		}); err == wait.ErrWaitTimeout {
			fmt.Printf(tourHavingTrouble, "The server didn't seem to start in time.")
			os.Exit(1)
		}

		fmt.Printf(tourOneStarted, defaultServerAddr)
	}
	continueTour()

	// create a pod
	fmt.Printf(tourTwo, cmd)
	continueTour()

	fmt.Printf(tourTwoCreate, cmd)
	if err := wait.Poll(time.Second, maxWait, waitForPod(kubeClient, "hello-openshift")); err == wait.ErrWaitTimeout {
		fmt.Printf(tourHavingTrouble, "The pod didn't seem to get created in time.")
		os.Exit(1)
	}

	// info about pod creation
	fmt.Printf(tourTwoCreated, cmd)
	continueTour()

	// more to come
	fmt.Printf(tourThree)
}

// EnsureDocker attempts to connect to the Docker daemon defined by the helper,
// and if it is unable to it will print a warning.
func (c *NodeConfig) EnsureDocker(docker *dockerutil.Helper) {
	dockerClient, dockerAddr, err := docker.GetClient()
	if err != nil {
		c.HandleDockerError(fmt.Sprintf("Unable to create a Docker client for %s - Docker must be installed and running to start containers.\n%v", dockerAddr, err))
		return
	}
	if url, err := url.Parse(dockerAddr); err == nil && url.Scheme == "unix" && len(url.Path) > 0 {
		s, err := os.Stat(url.Path)
		switch {
		case os.IsNotExist(err):
			c.HandleDockerError(fmt.Sprintf("No Docker socket found at %s. Have you started the Docker daemon?", url.Path))
			return
		case os.IsPermission(err):
			c.HandleDockerError(fmt.Sprintf("You do not have permission to connect to the Docker daemon (via %s). This process requires running as the root user.", url.Path))
			return
		case err == nil && s.IsDir():
			c.HandleDockerError(fmt.Sprintf("The Docker socket at %s is a directory instead of a unix socket - check that you have configured your connection to the Docker daemon properly.", url.Path))
			return
		}
	}
	if err := dockerClient.Ping(); err != nil {
		c.HandleDockerError(fmt.Sprintf("Docker could not be reached at %s.  Docker must be installed and running to start containers.\n%v", dockerAddr, err))
		return
	}

	glog.Infof("Connecting to Docker at %s", dockerAddr)

	env, err := dockerClient.Version()
	if err != nil {
		c.HandleDockerError(fmt.Sprintf("Unable to check for Docker server version.\n%v", err))
		return
	}

	serverVersionString := env.Get("ApiVersion")
	serverVersion, err := dockerclient.NewAPIVersion(serverVersionString)
	if err != nil {
		c.HandleDockerError(fmt.Sprintf("Unable to determine Docker server version from %q.\n%v", serverVersionString, err))
		return
	}

	minimumPullByIDVersion, err := dockerclient.NewAPIVersion(minimumDockerAPIVersionWithPullByID)
	if err != nil {
		c.HandleDockerError(fmt.Sprintf("Unable to check for Docker server version.\n%v", err))
		return
	}

	if serverVersion.LessThan(minimumPullByIDVersion) {
		c.HandleDockerError(fmt.Sprintf("Docker 1.6 or later (server API version 1.18 or later) required."))
		return
	}

	c.DockerClient = dockerClient
}