1、# 先确认并开启firewalld服务
$ sudo systemctl status firewalld
$ sudo systemctl enable firewalld
$ sudo systemctl start firewalld
# 直接编辑xml配置文件,比用firewall-cmd命令更方便其实(CentOS7里面默认就一个public.xml配置文件)
# Ubuntu系统中的默认public.xml配置文件位于/usr/lib/firewalld/zones
$ sudo vim /etc/firewalld/zones/public.xml
2、配置文件修改内容,移除所有<service>标签内容,然后添加允许访问的IP或IP段:
<?xml version="1.0" encoding="utf-8"?>
<zone>
<short>Public</short>
<description>For use in public areas. You do not trust the other computers on networks to not harm your computer. Only selected incoming connections are accepted.</description>
<!-- 允许IP段访问本服务器所有端口 -->
<rule family="ipv4">
<source address="10.1.50.192/32"/>
<accept/>
</rule>
<rule family="ipv4">
<source address="10.1.50.191/32"/>
<accept/>
</rule>
<rule family="ipv4">
<source address="10.1.19.111/32"/>
<!-- 允许IP段访问本服务器指定端口 -->
<port protocol="tcp" port="3306"/>
<accept/>
</rule>
<!-- 允许所有本本地服务器访问指定端口 -->
<port protocol="tcp" port="22"/>
</zone>
3、改完配置文件后重载一下防火墙服务
$ sudo firewall-cmd --reload