处置错误：Error: Failed to download metadata for repo 'appstream': Cannot prepare internal mirrorlist: No URLs in mirrorlist
问题出现：
[root@CentOS84-IP08 ]#dnf in centos-release-stream
Repository extras is listed more than once in the configuration
CentOS Linux 8 - AppStream 80 B/s | 38 B 00:00
Error: Failed to download metadata for repo 'appstream': Cannot prepare internal mirrorlist: No URLs in mirrorlist分析问题：
因为CentOS团队从官方镜像中移除CentOS 8的所有包，现在被转移到 https://vault.centos.org。如需继续使用CentOS 8，可在/etc/yum.repos中用vault.centos.org代替mirror.centos.org
解决问题：
[root@CentOS84-IP08 ]#lsb_release -a
LSB Version: :core-4.1-amd64:core-4.1-noarch
Distributor ID: CentOS
Description: CentOS Linux release 8.5.2111
Release: 8.5.2111
Codename: n/a
[root@CentOS84-IP08 ]#ll /etc/yum.repos.d/
total 108
-rw-r--r-- 1 root root 2796 Jan 15 03:08 base.repo
-rw-r--r-- 1 root root 721 May 6 21:26 CentOS-Linux-AppStream.repo
-rw-r--r-- 1 root root 706 May 6 21:26 CentOS-Linux-BaseOS.repo
-rw-r--r-- 1 root root 1132 May 6 21:26 CentOS-Linux-ContinuousRelease.repo
-rw-r--r-- 1 root root 318 May 6 21:26 CentOS-Linux-Debuginfo.repo
-rw-r--r-- 1 root root 734 May 6 21:26 CentOS-Linux-Devel.repo
-rw-r--r-- 1 root root 706 May 6 21:26 CentOS-Linux-Extras.repo
-rw-r--r-- 1 root root 721 May 6 21:26 CentOS-Linux-FastTrack.repo
-rw-r--r-- 1 root root 742 May 6 21:26 CentOS-Linux-HighAvailability.repo
-rw-r--r-- 1 root root 693 May 6 21:26 CentOS-Linux-Media.repo
-rw-r--r-- 1 root root 708 May 6 21:26 CentOS-Linux-Plus.repo
-rw-r--r-- 1 root root 726 May 6 21:26 CentOS-Linux-PowerTools.repo
-rw-r--r-- 1 root root 1124 May 6 21:26 CentOS-Linux-Sources.repo
-rw-r--r-- 1 root root 725 Dec 20 2019 CentOS-Stream-AppStream.repo
-rw-r--r-- 1 root root 706 Dec 20 2019 CentOS-Stream-Base.repo
-rw-r--r-- 1 root root 796 Dec 20 2019 CentOS-Stream-centosplus.repo
-rw-r--r-- 1 root root 666 Dec 20 2019 CentOS-Stream-Debuginfo.repo
-rw-r--r-- 1 root root 750 Dec 20 2019 CentOS-Stream-Extras.repo
-rw-r--r-- 1 root root 932 Dec 20 2019 CentOS-Stream-Media.repo
-rw-r--r-- 1 root root 730 Dec 20 2019 CentOS-Stream-PowerTools.repo
-rw-r--r-- 1 root root 1374 Dec 20 2019 CentOS-Stream-Sources.repo
-rw-r--r-- 1 root root 74 Dec 20 2019 CentOS-Stream-Vault.repo
-rw-r--r-- 1 root root 358 May 6 21:27 redhat.repo
[root@CentOS84-IP08 ]#
[root@CentOS84-IP08 ]#sed -i 's/mirrorlist/#mirrorlist/g' /etc/yum.repos.d/CentOS-*
[root@CentOS84-IP08 ]#sed -i 's|#baseurl=http://mirror.centos.org|baseurl=http://vault.centos.org|g' /etc/yum.repos.d/CentOS-*
root@CentOS84-IP08 ]#dnf in centos-release-stream
Repository extras is listed more than once in the configuration
CentOS Linux 8 - AppStream 1.5 MB/s | 8.4 MB 00:05
CentOS Linux 8 - BaseOS 999 kB/s | 4.6 MB 00:04
CentOS Linux 8 - Extras 5.6 kB/s | 10 kB 00:01
Last metadata expiration check: -1 day, 23:46:00 ago on Fri 06 May 2022 09:41:11 PM CST.
Dependencies resolved.
====================================================================================
Package Architecture Version Repository Size
====================================================================================
Installing:
centos-release-stream x86_64 8.1-1.1911.0.7.el8 extras 11 k
Transaction Summary
====================================================================================
Install 1 Package
Total download size: 11 k
Installed size: 6.6 k
Is this ok [y/N]: y
Downloading Packages:
centos-release-stream-8.1-1.1911.0.7.el8.x86_64.rpm 10 kB/s | 11 kB 00:01
-------------------------------------------------------------------------------------
Total 10 kB/s | 11 kB 00:01
Running transaction check
Transaction check succeeded.
Running transaction test
Transaction test succeeded.
Running transaction
Preparing : 1/1
Installing : centos-release-stream-8.1-1.1911.0.7.el8.x86_64 1/1
Verifying : centos-release-stream-8.1-1.1911.0.7.el8.x86_64 1/1
Installed products updated.
Installed:
centos-release-stream-8.1-1.1911.0.7.el8.x86_64
Complete!
[root@CentOS84-IP08 ]#
