1. wget -O /etc/yum.repos.d/CentOS-Base.repo http://mirrors.aliyun.com/repo/Centos-7.repo
    2. yum makecache
    3. yum install docker -y
    4. systemctl start docker
    5. systemctl enable docker
    6. systemctl status docker
    7. vi /etc/docker/daemon.json 
      1. {
      2. "registry-mirrors": ["https://zgw45f6f.mirror.aliyuncs.com","http://hub-mirror.c.163.com", "https://docker.mirrors.ustc.edu.cn"]
      3. }