1. 检查防火墙状态
firewall-cmd --state
2. 启动/关闭防火墙
systemctl start firewalld.service
systemctl stop firewalld.service
3. 永久启动/关闭防火墙
systemctl enable firewalld.service
systemctl disable firewalld.service
原文：https://www.cnblogs.com/poetcoder/p/13223501.html