# 停止firewalld服务
systemctl stop firewalld
systemctl mask firewalld
# 安装iptables-services
yum install iptables-services
Enable the service at boot-time:
# 启动iptables服务
systemctl enable iptables
# 管理iptables
systemctl [stop|start|restart] iptables
# 保存规则
service iptables save 或者 /usr/libexec/iptables/iptables.init save
centos7不再使用iptables，而是使用firewalld
若不想使用firewalld，继续使用iptables，可以停掉firewalld，并且安装iptables-services包
systemctl stop firewalld
systemctl disable firewalld
yum install -y iptables-services
systemctl enable iptables
systemctl start iptables
之环形链表)
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