centos7中如何关闭、启动防火墙

001、查看防火墙状态

systemctl status firewalld

002、关闭防火墙

systemctl stop firewalld

003、查看关闭防火墙状态

systemctl status firewalld

004、启动防火墙并查看状态

systemctl start firewalld
systemctl status firewalld

005、永久关闭防火墙（开机后为关闭状态）

systemctl disable firewalld

006、设置开启启动防火墙

systemctl enable firewalld