yum下载地址错误 CentOS官网文件下载地址

由于yum出现异常，修改出好多问题，决定卸载之后重新下载，参考文章：“yum的卸载与重新安装”链接：https://blog.youkuaiyun.com/m0_37886429/article/details/75009382

但是，删除之后，发现下载不了。

查询之后，发现yum的下载地址变更为：

wget https://vault.centos.org/6.10/os/x86_64/Packages/yum-3.2.29-81.el6.centos.noarch.rpm

 下载之后，安装：

 由于上一个版本的历史遗留问题，发现yum makecache失败，失败原因如下：

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 knowledge base article 

https://access.redhat.com/articles/1320623

If above article doesn't help to resolve this issue please open a ticket with Red Hat Support.

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

然后修改文件：vim /etc/yum.repos.d/CentOS-Base.repo，如图：

 修改地址为：https://vault.centos.org/6.10/os/$basearch/

 全部修改方法：vim 中的替换命令

 再次yum makecache 成功

yum中 yum.repos.d 中文件下载

如果一不小心把/etc/yum.repos.d/文件夹中的文件CentOS-Base.repo等删除了，那您需要重新下载一份，下载地址为：

 https://vault.centos.org/6.10/os/x86_64/Packages/centos-release-6-10.el6.centos.12.3.x86_64.rpm

根据您的CentOS版本，在 https://vault.centos.org中选择版本。