A CentOS mirror near me has ceph-octopus and ceph-pacific directories. (Stream-8 mirror there has ceph-pacific and ceph-quincy.)
So, there seem to be SIG repos for some recent Ceph versions.
(Nautilus remains that latest for CentOS 7, apparently.)
End of January, all repositories listed under > CentOS Mirror will be removed (except for SIGs that > opted-in for the ‘switch to RHEL 8 buildroot’ plan)
I solved this problem by replace the mirrorlist to baseurl for following file at /etc/yum.repos.d
Because the http://mirrorlist.centos.org does not have the content now.
List item
CentOS-Advanced-Virtualization.repo
CentOS-Ceph-Nautilus.repo
CentOS-Ceph-Nautilus.repo.bak
CentOS-Messaging-rabbitmq.repo
CentOS-NFV-OpenvSwitch.repo
CentOS-OpenStack-victoria.repo