1:查看防火状态
systemctl status firewalld
service iptables status
2:暂时关闭防火墙
systemctl stop firewalld
service iptables stop
3:永久关闭防火墙
systemctl disable firewalld
chkconfig iptables off
4:重启防火墙
systemctl enable firewalld
service iptables restart
5:永久关闭后重启
//暂时还没有试过
chkconfig iptables on
6：centos7自带的防火墙的相关指令
systemctl stop firewalld.service #停止firewall
systemctl disable firewalld.service #禁止firewall开机启动
systemctl status firewalld.service #查看firewall的状态