查看已开放的端口 firewall-cmd --list-ports 开放端口(开放后需要要重启防火墙才生效) firewall-cmd --zone=public --add-port=3338/tcp --permanent 重启防火墙 firewall-cmd --reload 关闭端口(关闭后需要要重启防火墙才生效) firewall-cmd --zone=public --remove-port=3338/tcp --permanent 开机启动防火墙 systemctl enable firewalld 开启防火墙 systemctl start firewalld 禁止防火墙开机启动 systemctl disable firewalld 停止防火墙 systemctl stop firewalld