问题描述

在CentOS 8.2上安装软件时，遇到如下报错：

CentOS Linux 8 - AppStream 错误：为仓库 ‘appstream’ 下载元数据失败 : Cannot prepare internal mirrorlist: No URLs in mirrorlist

在网上一顿搜索也没能解决，最终在阿里云开发者社区找到了答案！网址为：https://developer.aliyun.com/mirror/centos

问题原因

CentOS Linux 8在2022年12月31日来到生命周期终点（End of Life，EoL）。即CentOS Linux 8操作系统版本结束了生命周期（EOL），Linux社区已不再维护该操作系统版本。所以原来的CentOS Linux 8的yum源也都失效了！最终导致此问题的产生。

问题解决方法

更换CentOS Linux 8的yum源

请按照下面步骤一步步执行

1.对原来的yum文件进行备份

rename '.repo' '.repo.bak' /etc/yum.repos.d/*.repo

2.下载最新的阿里云的yum文件

wget https://mirrors.aliyun.com/repo/Centos-vault-8.5.2111.repo -O /etc/yum.repos.d/Centos-vault-8.5.2111.repo && wget https://mirrors.aliyun.com/repo/epel-archive-8.repo -O/etc/yum.repos.d/epel-archive-8.repo

3.替换文件里面的内容
注意需要替换4次!!!

sed -i 's/mirrors.cloud.aliyuncs.com/url_tmp/g'  /etc/yum.repos.d/Centos-vault-8.5.2111.repo &&  sed -i 's/mirrors.aliyun.com/mirrors.cloud.aliyuncs.com/g' /etc/yum.repos.d/Centos-vault-8.5.2111.repo && sed -i 's/url_tmp/mirrors.aliyun.com/g' /etc/yum.repos.d/Centos-vault-8.5.2111.repo
sed -i 's/mirrors.aliyun.com/mirrors.cloud.aliyuncs.com/g' /etc/yum.repos.d/epel-archive-8.repo
sed -i 's/mirrors.cloud.aliyuncs.com/mirrors.aliyun.com/g'  /etc/yum.repos.d/Centos-vault-8.5.2111.repo
sed -i 's/mirrors.cloud.aliyuncs.com/mirrors.aliyun.com/g'  /etc/yum.repos.d/epel-archive-8.repo

4.清除缓存和建立元数据

yum clean all && yum makecache

一次性全部复制

rename '.repo' '.repo.bak' /etc/yum.repos.d/*.repo
wget https://mirrors.aliyun.com/repo/Centos-vault-8.5.2111.repo -O /etc/yum.repos.d/Centos-vault-8.5.2111.repo && wget https://mirrors.aliyun.com/repo/epel-archive-8.repo -O/etc/yum.repos.d/epel-archive-8.repo
sed -i 's/mirrors.cloud.aliyuncs.com/url_tmp/g'  /etc/yum.repos.d/Centos-vault-8.5.2111.repo &&  sed -i 's/mirrors.aliyun.com/mirrors.cloud.aliyuncs.com/g' /etc/yum.repos.d/Centos-vault-8.5.2111.repo && sed -i 's/url_tmp/mirrors.aliyun.com/g' /etc/yum.repos.d/Centos-vault-8.5.2111.repo
sed -i 's/mirrors.aliyun.com/mirrors.cloud.aliyuncs.com/g' /etc/yum.repos.d/epel-archive-8.repo
sed -i 's/mirrors.cloud.aliyuncs.com/mirrors.aliyun.com/g'  /etc/yum.repos.d/Centos-vault-8.5.2111.repo
sed -i 's/mirrors.cloud.aliyuncs.com/mirrors.aliyun.com/g'  /etc/yum.repos.d/epel-archive-8.repo
yum clean all && yum makecache