问题:老是关闭防火墙太麻烦，所以选择彻底关闭防火墙，发现每次都记不住命令!
下面是red hat/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