三行代码修复 No URLs in mirrorlist — Centos 8 源

#到下面目录

cd /etc/yum.repos.d/

#输入下面两行自动添加源

sed -i 's/mirrorlist/#mirrorlist/g' /etc/yum.repos.d/CentOS-*

sed -i 's|#baseurl=http://mirror.centos.org|baseurl=http://vault.centos.org|g' /etc/yum.repos.d/CentOS-*

#更新

yum update -y

教程来源

https://yegorshytikov.medium.com/error-failed-to-download-metadata-for-repo-appstream-cannot-prepare-internal-mirrorlist-no-959768e5f8e5