linux下防火墙操作常用命令
启动： systemctl start firewalld
查看状态： systemctl status firewalld
禁用，禁止开机启动： systemctl disable firewalld
停止运行： systemctl stop firewalld
启动： systemctl start firewalld
查看状态： systemctl status firewalld
禁用，禁止开机启动： systemctl disable firewalld
停止运行： systemctl stop firewalld
