在centos7中用iptables命令配置完策略规则后，需要保存策略永久生效，执行service iptables save时提示：
# service iptables save
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.
的错误信息的解决方法：
1、先执行如下命令：
systemctl stop firewalld
systemctl mask firewalld
2、安装iptables services
yum install iptables-services
3、设置开机启动
systemctl enable iptables
4、重启iptables service
systemctl restart iptables
5、执行保存配置命令
service iptables save
