Centos修改yum源并安装docker
首先备份/etc/yum.repos.d/CentOS-Base.repo下载对应版本repo文件, 放入/etc/yum.repos.d/(操作前请做好相应备份)
[*]CentOS5
[*]CentOS6
运行yum makecache生成缓存eple源：
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rpm -Uvh http://ftp.sjtu.edu.cn/fedora/epel/6/i386/epel-release-6-8.noarch.rpm
docker 安装：You will need RHEL 6.5 or higher, with a RHEL 6 kernel version 2.6.32-431 or higher as this has specific kernel fixes to allow Docker to work.CentOS 6.5已经是2.6.32-431内核了，所以最好安装这个版本。
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yum -y install docker-io
升级：
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yum -y update docker-io
手动升级：
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wget https://get.docker.io/builds/Linux/x86_64/docker-latest -O dockermv -f docker /usr/bin/docker
升级完成启动：
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service docker start
开机启动：
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chkconfig docker on
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