docker_practice/install/centos.md

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## CentOS系列安装docker
Docker支持CentOS6及以后的版本。
对于CentOS6可以使用[EPEL](https://fedoraproject.org/wiki/EPEL)库安装Docker命令如下
```
$ sudo yum install http://mirrors.yun-idc.com/epel/6/i386/epel-release-6-8.noarch.rpm
$ sudo yum install docker-io
```
CentOS7系统CentOS-Extras库中已带Docker可以直接安装
```
$ sudo yum install docker
```
安装之后启动Docker服务并让它随系统启动自动启动。
```
$ service docker start
$ chkconfig docker on
```