这个时候，没有一个repo可以使用，只有0个软件，而且不能顺利解析mirrorlist.centos.org这个网址，初步怀疑它所有网站都不能解析
这就是DNS解析器的关系，所以在解析的配置文件修改一下
发现resolv.conf里面已经配置了，那应该是防火墙的问题，检查过后漏了这么一条
这条规则我也不是太清楚是什么意思，《鸟哥linux私房菜》里面说，这条规则可以让本机通过向外发出请求而响应的数据可以进入本机，以后搞明白了再补充
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