先卸载系统的旧版本

yum remove docker \

              docker-common \

              docker-selinux \

              docker-engine

设置仓库

yum install -y yum-utils \

  device-mapper-persistent-data \

  lvm2

yum-config-manager --add-repo http://mirrors.aliyun.com/docker-ce/linux/centos/docker-ce.repo

安装Docker

yum install docker-ce

启动Docker

systemctl start docker

参考文档：http://blog.51cto.com/hellocjq/2070756