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restruct the chapter to make it more understanding

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Baohua Yang
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## 获取镜像
可以使用`docker pull`命令来从仓库获取所需要的镜像。
下面的例子将从Docker Hub仓库下载一个Ubuntu 12.04操作系统的镜像。
```
$ sudo docker pull ubuntu:12.04
Pulling repository ubuntu
ab8e2728644c: Pulling dependent layers
511136ea3c5a: Download complete
5f0ffaa9455e: Download complete
a300658979be: Download complete
904483ae0c30: Download complete
ffdaafd1ca50: Download complete
d047ae21eeaf: Download complete
```
下载过程中，会输出获取镜像的每一层信息。
该命令实际上相当于`$ sudo docker pull registry.hub.docker.com/ubuntu:12.04`命令，即从注册服务器`registry.hub.docker.com`中的`ubuntu`仓库来下载标记为`12.04`的镜像。
有时候官方仓库注册服务器下载较慢，可以从其他仓库下载。
从其它仓库下载时需要指定完整的仓库注册服务器地址。例如
```
$ sudo docker pull www.dockerpool.com:5000/ubuntu:12.04
Pulling www.dockerpool.com:5000/ubuntu
ab8e2728644c: Pulling dependent layers
511136ea3c5a: Download complete
5f0ffaa9455e: Download complete
a300658979be: Download complete
904483ae0c30: Download complete
ffdaafd1ca50: Download complete
d047ae21eeaf: Download complete
```
完成后，即可随时使用该镜像了，例如创建一个容器，让其中运行bash应用。
```
$ sudo docker run -t -i ubuntu:12.04 /bin/bash
root@fe7fc4bd8fc9:/#
```