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@xxxxxxxxx>:
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@xxxxxx> 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/#recovery-using-osds
Zitat von Gilberto Ferreira <gilberto.nunes32@xxxxxxxxx>:
> 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
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