centos7执行" service iptables save"错误提示

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时提示错误如下：

# 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.

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. 就可以执行保存配置命令了：

    service iptables save