用Hello World校验Docker的安装


用Docker运行Hello World镜像，命令如下：

# docker run hello-world
Unable to find image 'hello-world:latest' locally
latest: Pulling from hello-world
535020c3e8ad: Pull complete
af340544ed62: Pull complete
Digest: sha256:a68868bfe696c00866942e8f5ca39e3e31b79c1e50feaee4ce5e28df2f051d5c
Status: Downloaded newer image for hello-world:latest

Hello from Docker.
This message shows that your installation appears to be working correctly.

To generate this message, Docker took the following steps:
 1. The Docker client contacted the Docker daemon.
 2. The Docker daemon pulled the "hello-world" image from the Docker Hub.
 3. The Docker daemon created a new container from that image which runs the
    executable that produces the output you are currently reading.
 4. The Docker daemon streamed that output to the Docker client, which sent it
    to your terminal.

To try something more ambitious, you can run an Ubuntu container with:
 $ docker run -it ubuntu bash

Share images, automate workflows, and more with a free Docker Hub account:
 https://hub.docker.com

For more examples and ideas, visit:
 https://docs.docker.com/userguide/
可见，Docker注册服务器从Docker Hub获取到最新的Hello World镜像，下载到了本地。可以再次运行Hello World镜像。

# docker run hello-world

Hello from Docker.
This message shows that your installation appears to be working correctly.

To generate this message, Docker took the following steps:
 1. The Docker client contacted the Docker daemon.
 2. The Docker daemon pulled the "hello-world" image from the Docker Hub.
 3. The Docker daemon created a new container from that image which runs the
    executable that produces the output you are currently reading.
 4. The Docker daemon streamed that output to the Docker client, which sent it
    to your terminal.

To try something more ambitious, you can run an Ubuntu container with:
 $ docker run -it ubuntu bash

Share images, automate workflows, and more with a free Docker Hub account:
 https://hub.docker.com

For more examples and ideas, visit:
 https://docs.docker.com/userguide/
可见，Hello World镜像运行成功，Docker的安装也没有问题。

更多Docker相关教程见以下内容：

Docker安装应用(CentOS 6.5_x64)  

Ubuntu 14.04安装Docker   

Ubuntu使用VNC运行基于Docker的桌面系统 

阿里云CentOS 6.5 模板上安装 Docker  

Ubuntu 15.04下安装Docker   

在Ubuntu Trusty 14.04 (LTS) (64-bit)安装Docker  

在 Ubuntu 15.04 上如何安装Docker及基本用法

Docker 的详细介绍：请点这里
Docker 的下载地址：请点这里

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