下文中的客户服务器的操作系统版本：CentOS Linux release 7.9.2009 (Core)
前两天给客户的服务器（客户自己的服务器，不是买的那种云服务器） 使用yum命令进行安装软件搭建环境的时候，一直报错，比如说 使用yum update命令，报如下的错误：
[root@localhost ~]# yum update 已加载插件：fastestmirror, langpacks Loading mirror speeds from cached hostfile Could not retrieve mirrorlist http://mirrorlist.centos.org/?release=7&arch=x86_64&repo=os&infra=stock error was 14: curl#6 - "Could not resolve host: mirrorlist.centos.org; 未知的错误" One of the configured repositories failed (未知), and yum doesn't have enough cached data to continue. At this point the only safe thing yum can do is fail. There are a few ways to work "fix" this: 1. Contact the upstream for the repository and get them to fix the problem. 2. Reconfigure the baseurl/etc. for the repository, to point to a working upstream. This is most often useful if you are using a newer distribution release than is supported by the repository (and the packages for the previous distribution release still work). 3. Run the command with the repository temporarily disabled yum --disablerepo=<repoid> ... 4. Disable the repository permanently, so yum won't use it by default. Yum will then just ignore the repository until you permanently enable it again or use --enablerepo for temporary usage: yum-config-manager --disable <repoid> or subscription-manager repos --disable=<repoid> 5. Configure the failing repository to be skipped, if it is unavailable. Note that yum will try to contact the repo. when it runs most commands, so will have to try and fail each time (and thus. yum will be be much slower). If it is a very temporary problem though, this is often a nice compromise: yum-config-manager --save --setopt=<repoid>.skip_if_unavailable=true Cannot find a valid baseurl for repo: base/7/x86_64
当然了，不止是使用yum update，使用yum install或其它yum命令，都是报和上面一样的错误= =
从字面意义上看是不能解析mirrorlist.centos.org这个地址，应该是跟dns网络配置有关系，经过多方查找相关资料及实验测试（网上关于这个问题的解决方案确实是五花八门 各领风骚~~），本文最后解决这个问题的方法是 在dns域名解析的配置文件增加dns服务器的ip地址：
[root@localhost ~]# vim /etc/resolv.conf nameserver 8.8.8.8 nameserver 202.106.0.20
保存后，重启网络服务
[root@localhost ~]# /etc/init.d/network restart Restarting network (via systemctl): [ 确定 ] [root@localhost ~]#
最后重新使用yum命令进行安装软件，一切恢复正常~~~
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