Error: Failed to download metadata for repo ‘appstream‘: Cannot prepare internal mirrorlist

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

原文：https://www.tecmint.com/error-failed-to-download-metadata-for-repo-appstream/