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这2天安装了虚拟机，然后准备用yun命令安装gcc，结果一直报各种错：
[root@node01 redis-5.0.14]# yum install gcc-c++
Loaded plugins: fastestmirror
Loading mirror speeds from cached hostfile
?* base: mirrors.aliyun.com
?* extras: mirrors.aliyun.com
?* updates: mirrors.aliyun.com
http://mirrors.aliyun.com/centos/6/os/x86_64/repodata/repomd.xml: [Errno 14] PYCURL ERROR 22 - "The requested URL returned error: 404 Not Found"
Trying other mirror.
http://mirrors.aliyuncs.com/centos/6/os/x86_64/repodata/repomd.xml: [Errno 14] PYCURL ERROR 7 - "couldn't connect to host"
Trying other mirror.
http://mirrors.cloud.aliyuncs.com/centos/6/os/x86_64/repodata/repomd.xml: [Errno 14] PYCURL ERROR 6 - "Couldn't resolve host 'mirrors.cloud.aliyuncs.com'"
Trying other mirror.
Error: Cannot retrieve repository metadata (repomd.xml) for repository: base. Please verify its path and try again
后面在网上找了很多方法，更改网络DNS之后重启、将CentOS-Base.repo备份重新拉取……
但是依然报错！！
整个人都要抓狂了，还好今天终于找到了原因——这个版本已经停止维护了！
下面采用了以下博主的方法，解决了这个问题：
Centos6 yum源 centos/6.6/os/x86_64/repodata/repomd.xml: [Errno 14] PYCURL ERRO 报错解决方法及新的源_醉世老翁的博客-CSDN博客
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