CentOS7 安装Docker CE

官方网站：https://docs.docker.com/engine/installation/linux/docker-ce/centos/

1. 卸载老版本Docker

   $ sudo yum remove docker \
                 docker-common \
                 docker-selinux \
                 docker-engine
   

2. 设置仓库

   $ sudo yum install -y yum-utils \
     device-mapper-persistent-data \
     lvm2
   

   $ sudo yum-config-manager \
       --add-repo \
       https://download.docker.com/linux/centos/docker-ce.repo
   

3. 安装Docker

   $ sudo yum install docker-ce
   

4. 启动Docker

   $ sudo systemctl start docker
   

5. 卸载Docker CE

   $ sudo yum remove docker-ce 
   $ sudo rm -rf /var/lib/docker