centos下/etc/sysconfig/下找不到iptables文件

原因：在新安装的Linux系统中，防火墙默认是被禁掉的，一般也没有配置过任何防火墙的策略，所有不存在/etc/sysconfig/iptables文件。

解决办法：
1、随便写一条iptables命令配置个防火墙规则：如：

iptables -P OUTPUT ACCEPT

2，进行保存

service iptables save

3，service iptables restart

异常

The service command supports only basic LSB actions (start, stop, restart, try-restart, reload, force-reload, status). For other actions, please try to use systemctl.

解决

With RHEL 7 / CentOS 7, firewalld was introduced to manage iptables. IMHO, firewalld is more suited for workstations than for server environments.

It is possible to go back to a more classic iptables setup. First, stop and mask the firewalld service:

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systemctl stop firewalld
systemctl mask firewalld

Then, install the iptables-services package:

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yum install iptables-services

Enable the service at boot-time:

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systemctl enable iptables

Managing the service

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systemctl stop iptables

systemctl start iptables

systemctl |restart iptables

Saving your firewall rules can be done as follows:

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service iptables save

or

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/usr/libexec/iptables/iptables.init save

转载：http://blog.youkuaiyun.com/xx123698/article/details/53424829