解决CentOS Stream 9报Errors during downloading metadata for repository ‘baseos’

由于CentOS Linux 7及之前版本还有CentOS Stream 8很快都要停更了，所以将服务器更新到CentOS Stream 9，但是装完却报“Errors during downloading metadata for repository ‘baseos’”，具体如下。

[root@xubingtao ~]# yum -y update
CentOS Stream 9 - BaseOS                                                                                     217 kB/s |  39 kB     00:00    
Errors during downloading metadata for repository 'baseos':
  - Status code: 404 for http://mirrors.bfsu.edu.cn/centos-stream/9-stream/BaseOS/x86_64/os/repodata/88c6d9f793a3657d6a31a13e38c19f4240f1ad6a69c78574e74c94d520f5e862-filelists.xml.gz (IP: 39.155.141.16)
  - Status code: 404 for http://mirrors.bfsu.edu.cn/centos-stream/9-stream/BaseOS/x86_64/os/repodata/7fa16b05e1c36124e62401bc39d112da9d7e19e27ed67a5f4e6151734a61da78-primary.xml.gz (IP: 39.155.141.16)
Error: Failed to download metadata for repo 'baseos': Yum repo downloading error: Downloading error(s): repodata/7fa16b05e1c36124e62401bc39d112da9d7e19e27ed67a5f4e6151734a61da78-primary.xml.gz - Cannot download, all mirrors were already tried without success; repodata/88c6d9f793a3657d6a31a13e38c19f4240f1ad6a69c78574e74c94d520f5e862-filelists.xml.gz - Cannot download, all mirrors were already tried without success

明显这是yum源出问题，只需要修改一下yum源即可，这里用清华的yum源。

先备份一下centos.repo文件。

mv /etc/yum.repos.d/centos.repo /etc/yum.repos.d/centos.repo.bak

然后修改centos.repo文件。

vim centos.repo

这里直接新建一个centos.repo文件然后填入以下清华的yum源配置信息。

[BaseOS]
name=CentOS Stream $releasever - BaseOS
#mirrorlist=http://mirrorlist.centos.org/?release=$stream&arch=$basearch&repo=BaseOS&infra=$infra
baseurl=http://mirrors.tuna.tsinghua.edu.cn/centos-stream/9-stream/BaseOS/x86_64/os/
gpgcheck=1
enabled=1
gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-centosofficial
 
 
[Appstream]
name=CentOS Stream $releasever - AppStream
#mirrorlist=http://mirrorlist.centos.org/?release=$stream&arch=$basearch&repo=AppStream&infra=$infra
baseurl=http://mirrors.tuna.tsinghua.edu.cn/centos-stream/9-stream/AppStream/x86_64/os/
gpgcheck=1
enabled=1
gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-centosofficial

清理一下缓存。