sudo systemctl disable firewalld --关闭防火墙
sudo systemctl enable firewalld --允许使用防火墙
sudo systemctl status firewalld --查看防火墙状态
sudo systemctl stop firewalld --本次停止防火墙，重启后失效
sudo systemctl start firewalld --打开防火墙
sudo systemctl restart firewalld --重启防火墙