查看防火墻狀態 ``` sudo systemctl status firewalld ``` 啟動防火墻 ``` sudo systemctl start firewalld ``` 停止防火墻 ``` sudo systemctl stop firewalld ``` 查看防火墻已經開放的端口 ``` firewall-cmd --list-port ``` 添加開放指定端口 ``` firewall-cmd --zone=public --add-port=需要開啟的端口號/tcp --permanent ``` 設置完成后要重新加載防火墻 ``` firewall-cmd --reload ```