1、查看当前的防火墙状态
systemctl status firewalld

2、临时手动关闭防火墙
systemctl stop firewalld

3、手动重启防火墙
systemclt restart firewalld

4、永久关闭防火墙
systemctl disable firewalld

5、关闭防火墙后重新开启防火墙
systemctl enable firewalld