Unit iptables.service could not be found

Centos7 以后都用 firewalld 取代了 iptables ，systemctl取代了service

首先要检查自己的虚拟机的版本是 6还是7

起初我错误的把CentOS6的命令套用在7上，出现了以下错误

查看防火墙状态时候出现

Redirecting to /bin/systemctl status iptables.service
Unit iptables.service could not be found.

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实际上CentOS7的命令已经更新了

1、查看防火墙状态

systemctl status firewalld.service

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如果出现绿色的标注 “active（running）”，说明防火墙是开启状态

2、开启防火墙

systemctl start firewalld.service

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3、关闭防火墙

systemctl stop firewalld.service

并检查一下防火墙状态

systemctl status firewalld.service

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