1、安装依赖包
yum install -y yum-utils device-mapper-persistent-data lvm2

2、配置yum 源
curl http://mirrors.aliyun.com/docker-ce/linux/centos/docker-ce.repo -o /etc/yum.repos.d/docker-ce.repo

3、查看Docker版本
yum list docker-ce.x86_64 --showduplicates | sort -r

4、安装Docker核心软件包
yum install -y --setopt=obsoletes=0
docker-ce-17.03.2.ce-1.el7.centos.x86_64
docker-ce-selinux-17.03.2.ce-1.el7.centos.noarch

5、启动Docker
systemctl restart docker
*如果改了配置，
systemctl daemon-reload
systemctl restart docker