Centos6.5 yum源失效mirrors.aliyun.com/centos/6/os/x86_64/repodata/repomd.xml: [Errno 14] PYCURL ERROR 22 – “The requested URL returned error: 404 Not Found”【显哥出品，必为精品】

1.前言

公司服务器系统有台是centos6的，使用yum安装软件的时候，报错，如下

[root@node1 ~]# yum makecache
Loaded plugins: fastestmirror, security
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.
To address this issue please refer to the below wiki article 

https://wiki.centos.org/yum-errors

If above article doesn't help to resolve this issue please use https://bugs.centos.org/.

http://mirrors.aliyuncs.com/centos/6/os/x86_64/repodata/repomd.xml: [Errno 12] Timeout on http://mirrors.aliyuncs.com/centos/6/os/x86_64/repodata/repomd.xml: (28, nnect() timed out!')
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

YumRepo Error: All mirror URLs are not using ftp, http[s] or file.
 Eg. Invalid release/repo/arch combination/
removing mirrorlist with no valid mirrors: /var/cache/yum/x86_64/6/base/mirrorlist.txt
Error: Cannot find a valid baseurl for repo: base

2.解决

访问报错的链接：http://mirrors.aliyun.com/centos/6/os/x86_64/repodata/repomd.xml
发现全部失效，阿里云官网，163官网的yum源全没了

解决方法：（把repo文件的内容全部替换如下）
yum clean all
然后yum makecache下

[base]
name=CentOS-$releasever
failovermethod=priority
baseurl=https://vault.centos.org/6.9/os/x86_64/
gpgcheck=0