One of the configured repositories failed (未知), and yum doesn‘t hav ...

centos操作体系运行yum命令是出现如下报错：

解决办法：

由于CentOS的源地址内容已移除，CentOS 操作体系结束了生命周期，源地址内容已移除。
只需要将它的base源换成其他可用源，我这里将它换成了阿里的base源
备份原来的源：

1. mv /etc/yum.repos.d/CentOS-Base.repo /etc/yum.repos.d/CentOS-Base.repo.backup

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执行如下命令安装新的源：

1. wget -O /etc/yum.repos.d/CentOS-Base.repo https://mirrors.aliyun.com/repo/Centos-7.repo

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重新执行yum相关命令，就可以正常使用了。
若显示wget命令不存在

需手动替换CentOS-Base.repo这个文件，替换成如下内容，发起直接复制粘贴替换原文件的内容，cat写入可能不生效：

1. # CentOS-Base.repo
2. #
3. # The mirror system uses the connecting IP address of the client and the
4. # update status of each mirror to pick mirrors that are updated to and
5. # geographically close to the client.  You should use this for CentOS updates
6. # unless you are manually picking other mirrors.
7. #
8. # If the mirrorlist= does not work for you, as a fall back you can try the
9. # remarked out baseurl= line instead.
10. #
11. #
13. [base]
14. name=CentOS-$releasever - Base - mirrors.aliyun.com
15. failovermethod=priority
16. baseurl=http://mirrors.aliyun.com/centos/$releasever/os/$basearch/
17.         http://mirrors.aliyuncs.com/centos/$releasever/os/$basearch/
18.         http://mirrors.cloud.aliyuncs.com/centos/$releasever/os/$basearch/
19. gpgcheck=1
20. gpgkey=http://mirrors.aliyun.com/centos/RPM-GPG-KEY-CentOS-7
22. #released updates
23. [updates]
24. name=CentOS-$releasever - Updates - mirrors.aliyun.com
25. failovermethod=priority
26. baseurl=http://mirrors.aliyun.com/centos/$releasever/updates/$basearch/
27.         http://mirrors.aliyuncs.com/centos/$releasever/updates/$basearch/
28.         http://mirrors.cloud.aliyuncs.com/centos/$releasever/updates/$basearch/
29. gpgcheck=1
30. gpgkey=http://mirrors.aliyun.com/centos/RPM-GPG-KEY-CentOS-7
32. #additional packages that may be useful
33. [extras]
34. name=CentOS-$releasever - Extras - mirrors.aliyun.com
35. failovermethod=priority
36. baseurl=http://mirrors.aliyun.com/centos/$releasever/extras/$basearch/
37.         http://mirrors.aliyuncs.com/centos/$releasever/extras/$basearch/
38.         http://mirrors.cloud.aliyuncs.com/centos/$releasever/extras/$basearch/
39. gpgcheck=1
40. gpgkey=http://mirrors.aliyun.com/centos/RPM-GPG-KEY-CentOS-7
42. #additional packages that extend functionality of existing packages
43. [centosplus]
44. name=CentOS-$releasever - Plus - mirrors.aliyun.com
45. failovermethod=priority
46. baseurl=http://mirrors.aliyun.com/centos/$releasever/centosplus/$basearch/
47.         http://mirrors.aliyuncs.com/centos/$releasever/centosplus/$basearch/
48.         http://mirrors.cloud.aliyuncs.com/centos/$releasever/centosplus/$basearch/
49. gpgcheck=1
50. enabled=0
51. gpgkey=http://mirrors.aliyun.com/centos/RPM-GPG-KEY-CentOS-7
53. #contrib - packages by Centos Users
54. [contrib]
55. name=CentOS-$releasever - Contrib - mirrors.aliyun.com
56. failovermethod=priority
57. baseurl=http://mirrors.aliyun.com/centos/$releasever/contrib/$basearch/
58.         http://mirrors.aliyuncs.com/centos/$releasever/contrib/$basearch/
59.         http://mirrors.cloud.aliyuncs.com/centos/$releasever/contrib/$basearch/
60. gpgcheck=1
61. enabled=0
62. gpgkey=http://mirrors.aliyun.com/centos/RPM-GPG-KEY-CentOS-7

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 末了执行如下命令完成：

1. yum clean all
3. yum makecacahe

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删除其他库

若还是无法运行yum ,检察base是否存在任何本地存储库或任何其他媒体存储库，如有别的的先删除其他的，命令：

1. ll /etc/yum.repos.d

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删除CentOS7-Base-163.repo这个base源:

1. rm -rf /etc/yum.repos.d/CentOS7-Base-163.repo

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再次运行如下命令：

1. yum clean all
3. yum makecacahe

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希望对你有资助，若遇到其他环境请留言，我看到了会第一时间回复。

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