yum install -y iptables
安装iptables-services
yum install iptables-services
禁用/停止自带的firewalld服务
停止firewalld服务
systemctl stop firewalld
禁用firewalld服务
systemctl mask firewalld
相当于以前的chkconfig iptables on
systemctl enable iptables.service
开启服务
systemctl start iptables.service
查看状态
systemctl status iptables.service
来源：https://my.oschina.net/liuzhenjn/blog/3086147