问题描述：CentOS8.2 yum安装时提示AppStream错误

tefuir_luo

已于 2022-04-17 13:44:31 修改

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分类专栏：笔记文章标签： centos

于 2022-04-17 12:59:04 首次发布

本文链接：https://blog.youkuaiyun.com/weixin_43139128/article/details/124228089

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在CentOS8.2上使用yum安装时遇到AppStream错误。解决方法包括更换国内的yum源，如阿里云或腾讯云，并清除缓存。错误源于CentOS-AppStream.repo未更新。通过查看更新后的CentOS-Base.repo，将内容复制到CentOS-AppStream.repo中，注释原有内容，从而修复问题。

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问题描述：CentOS8.2 yum安装时提示AppStream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)
错误：Failed to download metadata for repo 'AppStream': Cannot download repomd.xml: Cannot download repodata/repomd.xml: All mirrors were tried

解决办法：

更换国内yum源，建议更换为阿里云yum或者腾讯云yum

# 此处更换的为腾讯云
mv /etc/yum.repos.d/CentOS-Base.repo /etc/yum.repos.d/CentOS-Base.repo.backup.3
wget -O /etc/yum.repos.d/CentOS-Base.repo http://mirrors.cloud.tencent.com/repo/centos8_base.repo

清除之前的yum缓存

[root@tefuirluo ~]# yum clean all
Repository AppStream is listed more than once in the configuration
Repository extras is listed more than once in the configuration
Repository PowerTools is listed more than once in the configuration
Repository centosplus is listed more than once in the configuration
Repository fasttrack is listed more than once in the configuration
27 文件已删除

建立新的缓存

[root@tefuirluo ~]# yum makecache
Repository AppStream is listed more than once in the configuration
Repository ext

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