默认情况下
防火墙规则保存在如下两个文件中
/etc/sysconfig/iptables 和 /etc/sysconfig/ip6tables
yum install iptables-services ##安装
systemctl enable iptables ##开机启动
systemctl restart iptables ##重启服务
iptables -F##清空防火墙规则
service iptables save##保存当前防火前规则
systemctl disable iptables##取消开机启动
systemctl disable libvirtd.service##取消关联服务开机启动
libvirtd服务如果不取消开机启动的话 清空的防火墙规则会在下次重启前还原
参考文献
redhat官网原文关于iptables 详细说明
https://access.redhat.com/documentation/en-us/red_hat_enterprise_linux/6/html/security_guide/sect-security_guide-iptables
Iptables原理详解
https://www.cnblogs.com/ggjucheng/archive/2012/08/19/2646466.html