在尝试使用yum安装软件时遇到了404错误，问题源于AppStream源无法下载元数据。解决方案包括删除并替换AppStream源，下载新的阿里云CentOS和EPEL源，清除yum缓存并生成新缓存。
使用yum安装时出现如下错误：
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
1.删除AppStream源
rm -f /etc/yum.repos.d/CentOS-AppStream.repo
2.取消并备份旧yum源（可直接删除）
mv /etc/yum.repos.d/CentOS-Base.repo /etc/yum.repos.d/CentOS-Base.repo.backup
3.下载源
curl -o /etc/yum.repos.d/CentOS-Base.repo https://mirrors.aliyun.com/repo/Centos-vault-8.5.2111.repo
curl -o /etc/yum.repos.d/CentOS-epel.repo https://mirrors.aliyun.com/repo/epel-archive-8.repo
4.清除yum缓存
yum clean all
5.生成新缓存
yum makecache
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