centos 防火墙操作

1.开启防火墙

临时开启防火墙systemctl start firewalld
开机启动防火墙systemctl enable firewalld

2.查看防火墙状态

firewall-cmd --state

3.关闭防火墙

临时关闭防火墙：systemctl stop firewalld
禁止开机启动: systemctl disable firewalld

4.查看当前已开放的端口

firewall-cmd --list-ports

5.开启端口

firewall-cmd --zone=public --add-port=3306/tcp --permanent
需重启防火墙才会生效

6.重启防火墙

firewall-cmd --reload