1.更新yum源
yum -y update
2.安装依赖
yum install -y yum-utils device-mapper-persistent-data lvm2
3.添加repository
yum-config-manager --add-repo https://download.docker.com/linux/centos/docker-ce.repo
4.查看有哪些docker源可以安装
yum list docker-ce --showduplicates | sort -r
5.安装指定版本docker
#ce指社区版
yum -y install docker-ce-18.06.1.ce-3.el7
6.如安装较慢，可以更换国内云
yum-config-manager --add-repo https://mirrors.aliyun.com/docker-ce/linux/centos/docker-ce.repo
7.启动docker
systemctl start docker
8.查看进程
ps -ef | grep docker
9.设置开机自启动
systemctl enable docker
10.运行一个hello world
docker run hello-world