centos7将firewalld换成iptables

关闭及停止使用 firewalld:

systemctl mask firewalld
systemctl stop firewalld

安装iptables：

yum install -y iptables-services

生效及iptables开机启动：

systemctl enable iptables
systemctl start iptables

  查看是否开机启动和状态：

systemctl list-unit-files|grep iptables
systemctl status iptables