Yes, you need a monitor. The mgr is not required and can be deployed later. After you created the monitor, replace the mon store contents by the collected clustermaps from the mentioned procedure. Keep the ownerships of the directories/files in mind. If the monitor starts successfully (with the original FSID), you can try to start one of the OSDs. If that works, start the rest of them, wait for the peering storm to settle, create two more monitors and two mgr daemons. Note that if you lose the mon store and you had a CephFS, you'll need to recreate that from the existing pools. Zitat von Gilberto Ferreira <gilberto.nunes32@gmail.com>:
Hi
Do I need to create any mon and/or mgr in the new ceph cluster?
Em seg., 18 de ago. de 2025 às 13:03, Eugen Block <eblock@nde.ag> escreveu:
Hi,
this sounds like you created a new cluster (new fsid), the OSDs still have the previous fsid configured. I'd rather recommend to follow this procedure [0] to restore the mon store utilizing OSDs rather than trying to manipulate otherwise intact OSDs to fit into the "new" cluster. That way you'll have "your" cluster back. I don't know if there are any specifics to using proxmox, though. But the mentioned procedure seems to work just fine, I've read multiple reports on this list. Luckily, I haven't had to use it myself.
Regards, Eugen
[0]
https://docs.ceph.com/en/latest/rados/troubleshooting/troubleshooting-mon/#r...
Zitat von Gilberto Ferreira <gilberto.nunes32@gmail.com>:
Hi
I have 3 nodes Proxmox Cluster with CEPH, and after a crash, I have to reinstall Proxmox from scratch, along with Ceph. OSD are intact. I already did ceph-volume lvm activate --all and the OSD appears with ceph-volum lvm list and I got a folder with the name of the OSD under /var/lib/ceph/osd. However is not appear in ceph osd tree or ceph -s or even in the web gui. Is there any way to re-add this OSD to Proxmox CEPH?
Thanks a lot for any help.
Best Regards --- Gilbert _______________________________________________ ceph-users mailing list -- ceph-users@ceph.io To unsubscribe send an email to ceph-users-leave@ceph.io
_______________________________________________ ceph-users mailing list -- ceph-users@ceph.io To unsubscribe send an email to ceph-users-leave@ceph.io
_______________________________________________ ceph-users mailing list -- ceph-users@ceph.io To unsubscribe send an email to ceph-users-leave@ceph.io