1. 查看linux主机名        cat /etc/hostname

2. 修改网络配置            vim /etc/sysconfig/network-scripts/ifcfg-ens33

3.  查看防火墙状态:systemctl status firewalld.service

     关闭防火墙:systemctl stop firewalld.service

     永久关闭防火墙:systemctl disable firewalld.service