防火墙

firewall-cmd —reload
firewall-cmd —permanent —add-port=53/udp //添加端口
firewall-cmd —permanent —remove-port=53/tcp //移除端口
firewall-cmd —zone=public —list-ports //列表打开的端口
firewall-cmd —permanent —add-service=dns //添加服务
firewall-cmd —permanent —remove-service=dns //移除服务
firewall-cmd —permanent —query-service=dns //查询dns是否开放
firewall-cmd —permanent —list-service //查询所有开放的服务

firewall-cmd —permanent —add-port=53/udp
firewall-cmd —permanent —add-port=53/tcp
firewall-cmd —reload
firewall-cmd —permanent —add-service=dns