Centos如何永久关闭防火墙
查看防火墙状态
systemctl status firewalld.service
临时关闭防火墙
systemctl stop firewalld.service
永久关闭防火墙（先执行临时，再执行永久）
systemctl disable firewalld.service
systemctl status firewalld.service
systemctl stop firewalld.service
systemctl disable firewalld.service