CentOS is dead

Red Hat has finally pulled the plug on the CentOS

Announcement: CentOS Linux 8 is EOL of December 31st 2021

CentOS which has been backbone of all the major servers, there are alternatives now out there such as Rocky Linux and Alma Linux which claim 1:1 binary compatibility with RHEL

If you are a desktop user such as me, its better to migrate to Fedora

Also, if you are getting error such as

Failed to download metadata for repo 'appstream'

CentOS team has moved all their packages from mirrorlist.centos.org to vault.centos.org

Running below commands should solve the problem

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-*