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