CentOS-8 - AppStream Error

CentOS Linux 8作为RHEL 8的复刻版本，生命周期缩短，于2021年12月31日停止更新并停止维护（EOL）

yum 更新提示 Error: Failed to download metadata for repo 'AppStream'

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Repository epel is listed more than once in the configuration CentOS-8 - AppStream                                                                                                                                         8.3 kB/s | 2.3 kB     00:00 Errors during downloading metadata for repository 'AppStream':   - Status code: 404 for http://mirrors.cloud.aliyuncs.com/centos/8/AppStream/x86_64/os/repodata/repomd.xml (IP: 100.100.2.148) Error: Failed to download metadata for repo 'AppStream': Cannot download repomd.xml: Cannot download repodata/repomd.xml: All mirrors were tried

解决办法参考：https://blog.csdn.net/qq_47431361/article/details/122802111