https://github.com/ceph/ceph/pull/40544/commits/b38801cfd1c713e5cd8f5ae1007cfd97e48dab45 is missing in downstream that is the cause of the problem. initial bootstrap host is getting added without an addr and it cant resolve its own hostname. changes were cherry picked to downstream
Since the problem described in this bug report should be resolved in a recent advisory, it has been closed with a resolution of ERRATA. For information on the advisory (Red Hat Ceph Storage 5.0 bug fix and enhancement), and where to find the updated files, follow the link below. If the solution does not work for you, open a new bug report. https://access.redhat.com/errata/RHBA-2021:3294