Centos Appstream Error
[root@hecs-221218 network-scripts]# yum install rsync CentOS-8 - AppStream 3.4 kB/s | 394 B 00:00 Errors during downloading metadata for repository 'AppStream': - Status code: 404 for https://repo.huaweicloud.com/centos/8/AppStream/x86_64/os/repodata/repomd.xml (IP: 61.172.228.200) 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：
修改/etc/yum.repos.d/CentOS-AppStream.repo中的baseurl为 baseurl=https://mirrors.aliyun.com/centos/8-stream/AppStream/x86_64/os/