CentOs7关闭防火墙的命令
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