centos7安装，卸载docker
在网络通的情况下:yum install -y docker
2、检查docker安装情况：yum list installed | grep docker
3、启动docker容器：systemctl start docker.service
4、设置开启自启：systemctl enable docker.service
5、查看启动状态：systemctl status docker
centos7卸载docker
1、查看已经安装的docker进程:yum list installed | grep docker
2、删除对应的文件：yum -y remove containerd.io.x86_64
一个一个删就完事了