cd /etc/yum.repos.d
vim docker.repo
[dockerrepo]
name=Docker Repository
baseurl=https://yum.dockerproject.org/repo/main/centos/7/
enabled=1
gpgcheck=0
:wq!
yum clean all
yum list
yum install lrzsz vim wget -y
安装docker
yum install docker-engine -y
启动docker
systemctl start docker
ps -ef |grep docker 是否在运行