1、查看系统版本，系统内核3.10以上并卸载旧版本。
yum remove docker \ docker-client \ docker-client-latest \ docker-common \ docker-latest \ docker-latest-logrotate \ docker-logrotate \ docker-engine
2、docker安装
安装yum-utils软件包
yum install -y yum-utils
添加yum源
yum-config-manager \
--add-repo \
http://mirrors.aliyun.com/docker-ce/linux/centos/docker-ce.repo
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