一、安装firewalld

yum install firewalld

二、常用命令

2.1 启动防火墙

systemctl start firewalld

2.2 关闭防火墙

systemctl stop firewalld

2.3 查看防火墙状态

systemctl status firewalld

2.4 开机禁用

systemctl disable firewalld

2.5 开机启动

systemctl enable firewalld

2.6 开放端口

–permanent：永久有效，不加则重启之后失效

firewall-cmd --zone=public --add-port=80/tcp --permanent

2.6 查看单个开放端口

firewall-cmd --zone=public --query-port=80/tcp

2.7 查看所有开放端口

firewall-cmd --zone=public --list-ports

2.8 关闭端口

firewall-cmd --zone=public --remove-port=80/tcp --permanent