**1.查看防火墙状态** ``` firewall-cmd --state ``` runnin 代表防火墙正在运行中,如果防火墙处在关闭状态,则运行下面命令开启防火墙 ``` systemctl start firewalld.service ``` **2.查看某个端口是否放行** ``` firewall-cmd --query-port=端口号/tcp ``` **3.放行指定端口** ``` firewall-cmd --zone=public --add-port=8080/tcp --permanent ``` **3.1.重启防火墙** ``` systemctl restart firewalld.service ``` **3.2 重新载入配置** ``` firewall-cmd --reload ```