sudo systemctl disable firewalld --關閉防火牆
sudo systemctl enable firewalld --允許使用防火牆
sudo systemctl status firewalld --查看防火牆狀態
sudo systemctl stop firewalld --本次停止防火牆，重啟后失效
sudo systemctl start firewalld --打開防火牆
sudo systemctl restart firewalld --重啟防火牆