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/