CentOS7出现Unit iptables.service could not be found

CentOS7默认的防火墙不是iptables，而是firewalle.

出现此状况多是iptables防火墙未安装。

#中止firewalld服务

systemctl stop firewalld

#禁用firewalld服务

systemctl mask firewalld

开启

systemctl unmask firewalld

安装iptables-services：

yum install iptables-services

设置开机启动：

systemctl enable iptables systemctl [stop|start|restart] iptables #or service iptables [stop|start|restart] service iptables save #or /usr/libexec/iptables/iptables.init save

而后

service iptables status

开启： service iptables start

关闭： service iptables stop