1. 获取root权限

   su - root 输入密码
   

2. 查看防火墙状态

   systemctl status firewalld

3. 临时关闭防火墙

   systemctl stop firewalld

4. 永久关闭防火墙

   systemctl disable firewalld

5. 打开防火墙

   systemctl enable firewalld

Redhat Linux 命令关闭防火墙