在CenTos 7上开启关闭防火墙

1. 1

   查询防火墙状态：firewall-cmd --state

2. 2

   关闭防火墙：systemctl stop firewalld.service
3. 3

   开启防火墙： systemctl start firewalld.service

4. 禁止firewall开机启动：systemctl disable firewalld.service

5.