CentOS 7 yum无法使用解决方法
在centos7中使用yum命令时候报错：
问题原因
出现这个错误是因为使用的 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。
解决方法
进入/etc/yum.repos.d目录下找到 CentOS-Base.repo
进入目录：
cd /etc/yum.repos.d先备份下，然后编辑文件
cp CentOS-Base.repo CentOS-Base.repo.backup
vi CentOS-Base.repo修改内容为
# CentOS-Base.repo
#
# The mirror system uses the connecting IP address of the client and the
# update status of each mirror to pick mirrors that are updated to and
# geographically close to the client. You should use this for CentOS updates
# unless you are manually picking other mirrors.
#
# If the mirrorlist= does not work for you, as a fall back you can try the
# remarked out baseurl= line instead.
#
#
[base]
name=CentOS-$releasever - Base
#mirrorlist=http://mirrorlist.centos.org/?release=$releasever&arch=$basearch&repo=os&infra=$infra
#baseurl=http://mirror.centos.org/centos/$releasever/os/$basearch/
#baseurl=http://vault.centos.org/7.9.2009/x86_64/os/
baseurl=http://vault.centos.org/7.9.2009/os/$basearch/
gpgcheck=1
gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-CentOS-7
#released updates
[updates]
name=CentOS-$releasever - Updates
#mirrorlist=http://mirrorlist.centos.org/?release=$releasever&arch=$basearch&repo=updates&infra=$infra
#baseurl=http://mirror.centos.org/centos/$releasever/updates/$basearch/
#baseurl=http://vault.centos.org/7.9.2009/x86_64/os/
baseurl=http://vault.centos.org/7.9.2009/updates/$basearch/
gpgcheck=1
gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-CentOS-7
#additional packages that may be useful
[extras]
name=CentOS-$releasever - Extras
#mirrorlist=http://mirrorlist.centos.org/?release=$releasever&arch=$basearch&repo=extras&infra=$infra
#$baseurl=http://mirror.centos.org/centos/$releasever/extras/$basearch/
#baseurl=http://vault.centos.org/7.9.2009/x86_64/os/
baseurl=http://vault.centos.org/7.9.2009/extras/$basearch/
gpgcheck=1
gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-CentOS-7
#additional packages that extend functionality of existing packages
[centosplus]
name=CentOS-$releasever - Plus
#mirrorlist=http://mirrorlist.centos.org/?release=$releasever&arch=$basearch&repo=centosplus&infra=$infra
#baseurl=http://mirror.centos.org/centos/$releasever/centosplus/$basearch/
#baseurl=http://vault.centos.org/7.9.2009/x86_64/os/
baseurl=http://vault.centos.org/7.9.2009/centosplus/$basearch/
gpgcheck=1
enabled=0
gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-CentOS-7保存后执行
sudo yum clean all
sudo yum makecache等待完成
[root@localhost yum.repos.d]# sudo yum makecache
已加载插件：fastestmirror
Determining fastest mirrors
base | 3.6 kB 00:00:00
extras | 2.9 kB 00:00:00
updates | 2.9 kB 00:00:00
(1/10): base/x86_64/group_gz | 153 kB 00:00:00
(2/10): base/x86_64/primary_db | 6.1 MB 00:00:01
(3/10): base/x86_64/other_db | 2.6 MB 00:00:00
(4/10): extras/x86_64/primary_db | 253 kB 00:00:01
(5/10): extras/x86_64/other_db | 154 kB 00:00:00
(6/10): updates/x86_64/filelists_db | 15 MB 00:00:06
(7/10): updates/x86_64/other_db | 1.6 MB 00:00:00
(8/10): updates/x86_64/primary_db | 27 MB 00:00:07
(9/10): base/x86_64/filelists_db | 7.2 MB 00:00:17
(10/10): extras/x86_64/filelists_db | 305 kB 00:00:16
元数据缓存已建立然后执行以下命令
curl -o /etc/yum.repos.d/CentOS-Base.repo https://mirrors.aliyun.com/repo/Centos-7.repo
查看文件
cat /etc/yum.repos.d
镜像更换成阿里云即可，建议再执行下
sudo yum clean all
sudo yum makecache
