CentOS-8 - AppStream 28 B/s | 38 B 00:01 

CentOS-8 - Base 111 B/s | 38 B 00:00 

CentOS-8 - Extras 114 B/s | 38 B 00:00 

Failed to synchronize cache for repo 'AppStream', ignoring this repo.

Failed to synchronize cache for repo 'BaseOS', ignoring this repo.

Failed to synchronize cache for repo 'extras', ignoring this repo.

No matches found.

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解决方案：找到配置文件打开 /etc/yum.repos.d 修改baseurl 为阿里云的地址 。

cd /etc/yum.repos.d

vi CentOS-Base.repo

## 修改为如下内容

CentOS-Base.repo [BaseOS] name=CentOS-$releasever - Base baseurl=https://mirrors.aliyun.com/centos/$releasever/BaseOS/$basearch/os/

gpgcheck=1

enabled=1

gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-centosofficial

vi CentOS-AppStream.repo

## CentOS-AppStream.repo [AppStream] name=CentOS-$releasever - AppStream baseurl=https://mirrors.aliyun.com/centos/$releasever/AppStream/$basearch/os/

gpgcheck=1

enabled=1

gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-centosofficial

修改完之后执行 dnf命令或者yum 命令都可以

dnf clean all # 清除所有的缓存文件

dnf makecache # 制作元数据缓存

[extras]
name=CentOS-$releasever - Extras - mirrors.aliyun.com
failovermethod=priority
baseurl=http://mirrors.aliyun.com/centos/$releasever/extras/$basearch/
        http://mirrors.aliyuncs.com/centos/$releasever/extras/$basearch/
#mirrorlist=http://mirrorlist.centos.org/?release=$releasever&arch=$basearch&repo=extras
gpgcheck=1
gpgkey=http://mirrors.aliyun.com/centos/RPM-GPG-KEY-CentOS-7

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版权声明：本文为CSDN博主「安儿47」的原创文章，遵循 CC 4.0 BY-SA 版权协议，转载请附上原文出处链接及本声明。

原文链接：https://blog.csdn.net/benleng/article/details/103080644