systemctl stop firewalld.service 关闭防火墙
systemctl start firewalld.service 开启防火墙
firewall-cmd --state 查看防火墙运行状态
systemctl disable firewalld.service 禁止开机启动
centos 7 关闭防火墙
原文：https://www.cnblogs.com/MUQINGFENG123/p/11526568.html
