yum upgrade
…
Failed to download metadata for repo 'AppStream’
tail -n 100 /var/log/dnf.log
…
2022-03-10T10:24:34+0100 CRITICAL Error: Failed to download metadata for repo 'appstream’: Cannot prepare internal mirrorlist: No URLs in mirrorlist
wyłączamy stare repo i włączamy centos-stream:
dnf –disablerepo '*’ –enablerepo=extras swap cen
…