https://blog.csdn.net/babyxue/article/details/80970526
CentOS 7.6配置静态IP
https://blog.csdn.net/qq_39689711/article/details/105121553
CentOS 7.0默认使用的是firewall作为防火墙
查看防火墙状态
firewall-cmd --state
停止firewall
systemctl stop firewalld.service
禁止firewall开机启动
systemctl disable firewalld.service