CentOS 7 yum无法使用解决方法Could not retrieve mirrorlist http://mirro

报错：

1. fastestmirror 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"

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 出现这个错误是因为你使用的 CentOS 7 仓库已经被归档，当前的镜像地址无法找到所需的文件。CentOS 7 的官方支持已经结束，部分仓库已被移至归档库。这导致了你的 yum 命令无法找到所需的元数据文件。CentOS 7 的官方仓库在 2024 年 6 月 30 日之后已经停止维护。因此，使用最新的 CentOS 7 官方仓库可能会遇到问题。

解决方案

进入/etc/yum.repos.d目录下找到  CentOS-Base.repo

依次执行：

1. cp CentOS-Base.repo CentOS-Base.repo.backup
3. vi CentOS-Base.repo

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进入后改为：

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-$releasever - Base
15. #mirrorlist=http://mirrorlist.centos.org/?release=$releasever&arch=$basearch&repo=os&infra=$infra
16. #baseurl=http://mirror.centos.org/centos/$releasever/os/$basearch/
17. #baseurl=http://vault.centos.org/7.9.2009/x86_64/os/
18. baseurl=http://vault.centos.org/7.9.2009/os/$basearch/
19. gpgcheck=1
20. gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-CentOS-7
22. #released updates
23. [updates]
24. name=CentOS-$releasever - Updates
25. #mirrorlist=http://mirrorlist.centos.org/?release=$releasever&arch=$basearch&repo=updates&infra=$infra
26. #baseurl=http://mirror.centos.org/centos/$releasever/updates/$basearch/
27. #baseurl=http://vault.centos.org/7.9.2009/x86_64/os/
28. baseurl=http://vault.centos.org/7.9.2009/updates/$basearch/
29. gpgcheck=1
30. gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-CentOS-7
32. #additional packages that may be useful
33. [extras]
34. name=CentOS-$releasever - Extras
35. #mirrorlist=http://mirrorlist.centos.org/?release=$releasever&arch=$basearch&repo=extras&infra=$infra
36. #$baseurl=http://mirror.centos.org/centos/$releasever/extras/$basearch/
37. #baseurl=http://vault.centos.org/7.9.2009/x86_64/os/
38. baseurl=http://vault.centos.org/7.9.2009/extras/$basearch/
39. gpgcheck=1
40. gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-CentOS-7
42. #additional packages that extend functionality of existing packages
43. [centosplus]
44. name=CentOS-$releasever - Plus
45. #mirrorlist=http://mirrorlist.centos.org/?release=$releasever&arch=$basearch&repo=centosplus&infra=$infra
46. #baseurl=http://mirror.centos.org/centos/$releasever/centosplus/$basearch/
47. #baseurl=http://vault.centos.org/7.9.2009/x86_64/os/
48. baseurl=http://vault.centos.org/7.9.2009/centosplus/$basearch/
49. gpgcheck=1
50. enabled=0
51. gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-CentOS-7

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然后wq保存下，依次执行：

1. sudo yum clean all
2. sudo yum makecache

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阿里云镜像源

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

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

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两个命令都可以，执行完成后进入/etc/yum.repos.d

执行

1. cat CentOS-Base.repo

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看着镜像是阿里云的即可。 建议在执行下

1. sudo yum clean all
2. sudo yum makecache

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