问题描述
CentOS Linux 8 yum源下载软件失败：
yum update
CentOS Linux 8 - AppStream 14 B/s | 38 B 00:02
Error: Failed to download metadata for repo 'appstream': Cannot prepare internal mirrorlist: No URLs in mirrorlist
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源文章来源：https://www.toymoban.com/news/detail-665301.html
1、切换到源目录，备份原来的源
[root@localhost data]# cd /etc/yum.repos.d/
[root@localhost yum.repos.d]# mkdir bak
[root@localhost yum.repos.d]# mv CentOS-Linux-* bak
[root@localhost yum.repos.d]# ls
bak
2、下载新的源文件，并用命令yum makecache建立新的元数据缓存
下载源文件命令：文章来源地址https://www.toymoban.com/news/detail-665301.html
wget -O /etc/yum.repos.d/CentOS-Base.repo https://mirrors.aliyun.com/repo/Centos-vault-8.5.2111.repo
[root@localhost yum.repos.d]# wget -O /etc/yum.repos.d/CentOS-Base.repo https://mirrors.aliyun.com/repo/Centos-vault-8.5.2111.repo
--2022-11-05 08:53:51-- https://mirrors.aliyun.com/repo/Centos-vault-8.5.2111.repo
Resolving mirrors.aliyun.com (mirrors.aliyun.com)... 117.161.156.242, 117.161.156.239, 117.161.156.243, ...
Connecting to mirrors.aliyun.com (mirrors.aliyun.com)|117.161.156.242|:443... connected.
HTTP request sent, awaiting response... 200 OK
Length: 2495 (2.4K) [application/octet-stream]
Saving to: ‘/etc/yum.repos.d/CentOS-Base.repo’
/etc/yum.repos.d/CentOS-Base.repo 100%[=====================================================================>] 2.44K --.-KB/s in 0.02s
2022-11-05 08:53:53 (133 KB/s) - ‘/etc/yum.repos.d/CentOS-Base.repo’ saved [2495/2495]
[root@localhost yum.repos.d]# ls
bak CentOS-Base.repo
[root@localhost yum.repos.d]# vim CentOS-Base.repo
[root@localhost yum.repos.d]# yum makecache
CentOS-8.5.2111 - Base - mirrors.aliyun.com 171 kB/s | 4.6 MB 00:27
CentOS-8.5.2111 - Extras - mirrors.aliyun.com 35 kB/s | 10 kB 00:00
CentOS-8.5.2111 - AppStream - mirrors.aliyun.com 139 kB/s | 8.4 MB 01:02
Metadata cache created.
[root@localhost yum.repos.d]#
3、测试源（用yum命令装个软件试试）
[root@localhost yum.repos.d]# yum install -y yum-utils
Last metadata expiration check: 0:08:11 ago on Sat 05 Nov 2022 08:55:50 AM CST.
Dependencies resolved.
===================================================================================================================================================
Package Architecture Version Repository Size
===================================================================================================================================================
Installing:
yum-utils noarch 4.0.21-3.el8 base 73 k
Transaction Summary
===================================================================================================================================================
Install 1 Package
Total download size: 73 k
Installed size: 22 k
Downloading Packages:
yum-utils-4.0.21-3.el8.noarch.rpm 15 kB/s | 73 kB 00:04
---------------------------------------------------------------------------------------------------------------------------------------------------
Total 15 kB/s | 73 kB 00:04
Running transaction check
Transaction check succeeded.
Running transaction test
Transaction test succeeded.
Running transaction
Preparing : 1/1
Installing : yum-utils-4.0.21-3.el8.noarch 1/1
Running scriptlet: yum-utils-4.0.21-3.el8.noarch 1/1
Verifying : yum-utils-4.0.21-3.el8.noarch 1/1
Installed:
yum-utils-4.0.21-3.el8.noarch
Complete!
[root@localhost yum.repos.d]#
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