1.yum -y install wget
2.mv ./CentOS-Base.repo ./CentOS-Base.repo.bak
3.wget http://mirrors.163.com/.help/CentOS7-Base-163.repo
4.wget http://mirrors.aliyun.com/repo/Centos-7.repo
5.mv ./Centos-7.repo ./CentOS-Base.repo
6.yum clean all
7.yum makecache
8.sudo yum -y update
9.yum install -y yum-utils device-mapper-persistent-data lvm2
10.yum-config-manager --add-repo https://download.docker.com/linux/centos/docker-ce.repo
11.sudo yum-config-manager --add-repo http://mirrors.aliyun.com/docker-ce/linux/centos/docker-ce.repo
12.yum list docker-ce --showduplicates | sort -r
13.sudo yum install docker-ce
14.sudo systemctl start docker
15.docker version