CentOS8-Docker-19.03.4(yum安装)CentOS7.6-Docker CE(yum安装)CentOS7.6-Docker(rpm离线安装)CentOS7.6-Docker-19.03.2(tar离线安装)CentOS7.6-Docker-18.09.7(tar离线安装)CentOS7.4-Docker-19.03.4(yum安装)