tag上、push上和pull 取Docker 映像

在此之前需要拥有一个docker Hub账户，注册地址：https://hub.docker.com/。

Tag、Push Docker映像

1. 使用docker images 获取当前拥有的映像列表，其中可获取映像ID。

   $ docker images
    REPOSITORY           TAG          IMAGE ID            CREATED             SIZE
    docker-whale         latest       7d9495d03763         minutes ago      273.7 MB
    <none>               <none>       5dac217f722c         minutes ago      273.7 MB
    docker/whalesay      latest       fb434121fc77         hours ago          MB
    hello-world          latest       91c95931e552         weeks ago          B

2. 查找特定映像的ID，如 docker-whale：这个例子中的ID是：7d9495d03763 。注意：'REPOSITORY' 显示的是docker-whale的仓库名称，而不是命令空间，你需要将命令空间和你的Docker Hub账户联系起来，你的命令空间要和你的账户的账　　户名称相同，因此将其重命名'YOUR_DOCKERHUB_NAME/docker-whale' 。
   

    $ docker tag 7d9495d03763 maryatdocker/docker-whale:latest

   maryatdocker为自己的DockerHub账户。

3. docker login命令用于在命令行中登录Docker Hub账户：

    $ docker login
    Login with your Docker ID to push and pull images from Docker Hub. If you don't have a Docker ID, head over to https://hub.docker.com to create one.
    Username:
    Password:
    Login Succeeded

4. push 命令用于将映像推送到仓库当中：

    $ docker push maryatdocker/docker-whale
        The push refers to a repository [maryatdocker/docker-whale] (len: )
        7d9495d03763: Image already exists
        c81071adeeb5: Image successfully pushed
        eb06e47a01d2: Image successfully pushed
        fb434121fc77: Image successfully pushed
        5d5bd9951e26: Image successfully pushed
        99da72cfe067: Image successfully pushed
        1722f41ddcb5: Image successfully pushed
        5b74edbcaa5b: Image successfully pushed
        676c4a1897e6: Image successfully pushed
        07f8e8c5e660: Image successfully pushed
        37bea4ee0c81: Image successfully pushed
        a82efea989f9: Image successfully pushed
        e9e06b06e14c: Image successfully pushed
        Digest: sha256:ad89e88beb7dc73bf55d456e2c600e0a39dd6c9500d7cd8d1025626c4b985011

Pull 获取最新创建的映像

1. 使用docker rmi -f 强力移除本地已经存在的映像：

    $ docker rmi -f 7d9495d03763
    $ docker rmi -f docker-whale

   PS：使用ID或者名称均可。

2. 使用docker run 命令从仓库中拉取并载入映像：

   docker run yourusername/docker-whale

   PS：此处应该包含对应的Docker Hub账户名。