提一件拉胯的事：别去参考阿里和华为云官方镜像上面的解决办法，本人试了几遍，没luan用。拉胯！！！！！！！！

1、具体报错信息

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Errors during downloading metadata for repository 'epel':
  - Status code: 404 for http://archives.fedoraproject.org/pub/archive/epel/8/Everything/x86_64/repodata/repomd.xml (IP: 38.145.60.23)
Error: Failed to download metadata for repo 'epel': Cannot download repomd.xml: Cannot download repodata/repomd.xml: All mirrors were tried

2、原因

第三方的镜像站中均已移除CentOS 8的源，Centos 8版本已停止更新相应依赖导致的，下载新的yum源即可搞定

3、解决办法

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

mkdir -p /etc/yum.repos.d

curl https://mirrors.aliyun.com/repo/Centos-vault-8.5.2111.repo > /etc/yum.repos.d/Centos-vault-8.5.2111.repo

curl https://mirrors.aliyun.com/repo/epel-archive-8.repo > /etc/yum.repos.d/epel-archive-8.repo

yum clean all

yum makecache