官网
安装 docker
查看环境
[root@192 ~]# uname -r
3.10.0-514.el7.x86_64



$ sudo yum remove docker \
                  docker-client \
                  docker-client-latest \
                  docker-common \
                  docker-latest \
                  docker-latest-logrotate \
                  docker-logrotate \
                  docker-engine

$ sudo yum install -y yum-utils

$ sudo yum-config-manager \
    --add-repo \
    https://download.docker.com/linux/centos/docker-ce.repo  # 默认是国外的

$ sudo yum-config-manager \
    --add-repo \
    http://mirrors.aliyun.com/docker-ce/linux/centos/docker-ce.repo  # 国内阿里云

安装DOCKER引擎
    更新yum 软件包索引
    yum makecache fast

    sudo yum install docker-ce docker-ce-cli containerd.io

启动docker
    systemctl start docker
重新加载
    systemctl daemon-reload

重启
    systemctl restart docker
加入开机启动
 systemctl enable docker