CentOS8解决“Failed to download metadata for repo ‘appstream‘”错误

在CentOS8上执行下面命令时报错

yum install epel-release

CentOS Linux 8 - AppStream                       23  B/s |  38  B     00:01    
Error: Failed to download metadata for repo 'appstream': Cannot prepare internal mirrorlist: No URLs in mirrorlist

原因

在2022年1月31日，CentOS团队终于从官方镜像中移除CentOS 8的所有包。

CentOS 8已于2021年12月31日寿终正寝，但软件包仍在官方镜像上保留了一段时间。现在他们被转移到https://vault.centos.org

解决方法​

如果你仍然需要运行你的旧CentOS 8，你可以在/etc/yum.repos中更新repos.d使用vault.centos.org代替mirror.centos.org。

cd /etc/yum.repos.d
vi CentOS-Linux-BaseOS.repo
vi CentOS-Linux-AppStream.repo

[baseos]
name=CentOS Linux $releasever - BaseOS
#mirrorlist=http://mirrorlist.centos.org/?release=$releasever&arch=$basearch&repo=BaseOS&infra=$infra
#baseurl=http://mirror.centos.org/$contentdir/$releasever/BaseOS/$basearch/os/
baseurl=https://vault.centos.org/centos/$releasever/BaseOS/$basearch/os/
gpgcheck=1
enabled=1
gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-centosofficial

[appstream]
name=CentOS Linux $releasever - AppStream
#mirrorlist=http://mirrorlist.centos.org/?release=$releasever&arch=$basearch&repo=AppStream&infra=$infra
#baseurl=http://mirror.centos.org/$contentdir/$releasever/AppStream/$basearch/os/
baseurl=https://vault.centos.org/centos/$releasever/AppStream/$basearch/os/ 
gpgcheck=1
enabled=1
gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-centosofficial