查看已开放端口

firewall-cmd --list-ports

开放端口

firewall-cmd --zone=public --add-port=3338/tcp --permanent

重启防火墙

firewall-cmd --reload

关闭端口

firewall-cmd --zone=public --remove-port=3338/tcp --permanent

开启防火墙

systemctl start firewall

开机自启防火墙

systemctl enable firewalld

禁止开机自启防火墙

systemctl disable firewalld

停止防火墙

systemctl stop firewalld