centos7中没有service iptables save指令来保存防火墙规则

1.任意运行一条iptables防火墙规则配置命令：

iptables -P OUTPUT ACCEPT

2.对iptables服务进行保存：

service iptables save

如果上述命令执行失败报出：

The service command supports only basic LSB actions (start, stop, restart, try-restart, reload, force-reload, status). For other actions, please try to use systemctl.

解决方法：

systemctl stop firewalld 关闭防火墙
yum install iptables-services 安装或更新服务
再使用systemctl enable iptables 启动iptables
最后 systemctl start iptables 打开iptables

再执行service iptables save

3.重启iptables服务：

service iptables restart

执行完毕之后/etc/syscofig/iptables文件就有了

systemctl stop firewalld
yum -y install iptables-services
systemctl enable iptables
systemctl start iptables
service iptables save
service iptables restart