Yes, I was just mid-draft of a response explaining the single steps. ;-) I'll ping Zac tomorrow to update the docs to include the actual list of hosts. Zitat von Gilberto Ferreira <gilberto.nunes32@gmail.com>:
Well... Ends up I need to adapt the original script to this:
#!/bin/bash
ms=/root/monstore host=/root/hosts -------- here there's a list of my 3 nodes, one per line mkdir $ms
# collect the cluster map from stopped OSDs for host in $(cat /root/hosts); do rsync -avz $ms/. root@$host:$ms.remote rm -rf $ms ssh root@$host <<EOF for osd in /var/lib/ceph/osd/ceph-*; do ceph-objectstore-tool --data-path \$osd --no-mon-config --op update-mon-db --mon-store-path $ms.remote done EOF rsync -avz root@$host:$ms.remote/. $ms done
Now on node1 I have the following folder:
ls monstore/store.db/ 000008.sst 000013.sst 000018.sst 000023.sst 000028.sst 000029.log CURRENT IDENTITY LOCK MANIFEST-000030 OPTIONS-000027 OPTIONS-000032
I believe I am getting closer...
Em qua., 20 de ago. de 2025 às 15:19, Gilberto Ferreira < gilberto.nunes32@gmail.com> escreveu:
So right now I have this: pve01:~# find mon-store/ mon-store/ mon-store/ceph-0 mon-store/ceph-0/kv_backend mon-store/ceph-0/store.db mon-store/ceph-0/store.db/LOCK mon-store/ceph-0/store.db/IDENTITY mon-store/ceph-0/store.db/CURRENT mon-store/ceph-0/store.db/000004.log mon-store/ceph-0/store.db/MANIFEST-000005 mon-store/ceph-0/store.db/OPTIONS-000007 mon-store/ceph-1 mon-store/ceph-1/kv_backend mon-store/ceph-1/store.db mon-store/ceph-1/store.db/LOCK mon-store/ceph-1/store.db/IDENTITY mon-store/ceph-1/store.db/CURRENT mon-store/ceph-1/store.db/000004.log mon-store/ceph-1/store.db/MANIFEST-000005 mon-store/ceph-1/store.db/OPTIONS-000007
pve02:~# find mon-store/ mon-store/ mon-store/ceph-2 mon-store/ceph-2/kv_backend mon-store/ceph-2/store.db mon-store/ceph-2/store.db/LOCK mon-store/ceph-2/store.db/IDENTITY mon-store/ceph-2/store.db/CURRENT mon-store/ceph-2/store.db/000004.log mon-store/ceph-2/store.db/MANIFEST-000005 mon-store/ceph-2/store.db/OPTIONS-000007 mon-store/ceph-3 mon-store/ceph-3/kv_backend mon-store/ceph-3/store.db mon-store/ceph-3/store.db/LOCK mon-store/ceph-3/store.db/IDENTITY mon-store/ceph-3/store.db/CURRENT mon-store/ceph-3/store.db/000004.log mon-store/ceph-3/store.db/MANIFEST-000005 mon-store/ceph-3/store.db/OPTIONS-000007
pve03:~# find mon-store/ mon-store/ mon-store/ceph-4 mon-store/ceph-4/kv_backend mon-store/ceph-4/store.db mon-store/ceph-4/store.db/LOCK mon-store/ceph-4/store.db/IDENTITY mon-store/ceph-4/store.db/CURRENT mon-store/ceph-4/store.db/000004.log mon-store/ceph-4/store.db/MANIFEST-000005 mon-store/ceph-4/store.db/OPTIONS-000007 mon-store/ceph-5 mon-store/ceph-5/kv_backend mon-store/ceph-5/store.db mon-store/ceph-5/store.db/LOCK mon-store/ceph-5/store.db/IDENTITY mon-store/ceph-5/store.db/CURRENT mon-store/ceph-5/store.db/000004.log mon-store/ceph-5/store.db/MANIFEST-000005 mon-store/ceph-5/store.db/OPTIONS-000007
---
Em qua., 20 de ago. de 2025 às 15:15, Gilberto Ferreira < gilberto.nunes32@gmail.com> escreveu:
Ok... I am doing it again. I have 2 osd per node. Do I need to create multiple folder for each osd? Like node1: mon-store/ceph-osd0 mon-store/ceph-osd1 node2: mon-store/ceph-osd2 mon-store/ceph-osd3 node3: mon-store/ceph-osd3 mon-store/ceph-osd3
And than rsynced everything to one node let's say: nove1: /root/mon-store?
Which one I should use in order to restore or recreate the mon?
Sorry for so many questions. I am trying to understand the whole process, so bare with me.
Thanks for your patience.
---
Gilberto Nunes Ferreira +55 (47) 99676-7530 - Whatsapp / Telegram
Em qua., 20 de ago. de 2025 às 14:35, Eugen Block <eblock@nde.ag> escreveu:
I feel like there's still a misunderstanding here.
The mentioned procedure is:
ms=/root/mon-store mkdir $ms
# collect the cluster map from stopped OSDs for host in $hosts; do rsync -avz $ms/. user@$host:$ms.remote rm -rf $ms ssh user@$host <<EOF for osd in /var/lib/ceph/osd/ceph-*; do ceph-objectstore-tool --data-path \$osd --no-mon-config --op update-mon-db --mon-store-path $ms.remote done EOF rsync -avz user@$host:$ms.remote/. $ms done
It collects the clustermap on each host, querying each OSD, but then it "merges" it into one store, the local $ms store. That is used then to start up the first monitor. So however you do this, make sure you have all the clustermaps in one store. Did you stop the newly created mon first? And I don't care about the ceph-mon.target, that's always on to ensure the MON starts automatically after boot.
Can you clarify that you really have all the clustermaps in one store? If not, you'll need to repeat the steps. In theory the steps should work exactly as they're described.
Zitat von Gilberto Ferreira <gilberto.nunes32@gmail.com>:
That's strange. Now I have only the ceph-mon.target available:
systemctl status ceph-mon.target ● ceph-mon.target - ceph target allowing to start/stop all ceph-mon@ .service instances at once Loaded: loaded (/usr/lib/systemd/system/ceph-mon.target; enabled; preset: enabled) Active: active since Wed 2025-08-20 14:07:12 -03; 1min 47s ago Invocation: 1fcbb21af715460294bd6d8549557ed9
Notice: journal has been rotated since unit was started, output may be incomplete.
>> And you did rebuild the store from all OSDs as I mentioned, correct? Yes... Like that:
ceph-volume lvm activate --all mkdir /root/mon-store ceph-objectstore-tool --data-path /var/lib/ceph/osd/ceph-0 --no-mon-config --op update-mon-db --mon-store-path mon-store/ ceph-monstore-tool mon-store/ rebuild -- --keyring /etc/pve/priv/ceph.client.admin.keyring --mon-ids pve01 pve02 pve03 mv /var/lib/ceph/mon/ceph-pve01/store.db/ /var/lib/ceph/mon/ceph-pve01/store.db-bkp cp -rf mon-store/store.db/ /var/lib/ceph/mon/ceph-pve01/ chown -R ceph:ceph /var/lib/ceph/mon/ceph-pve01/store.db
On each node. ---
Gilberto Nunes Ferreira +55 (47) 99676-7530 - Whatsapp / Telegram
Em qua., 20 de ago. de 2025 às 13:49, Eugen Block <eblock@nde.ag> escreveu:
What does the monitor log? Does it at least start successfully? And you did rebuild the store from all OSDs as I mentioned, correct?
Zitat von Gilberto Ferreira <gilberto.nunes32@gmail.com>:
> Hi again... > I have reinstall all Proxmox nodes and install ceph on each node. > Create the mons and mgr on eatch node. > I have issue the command ceph-volume lvm activate --all, on each node, in > order bring up the /var/lib/ceph/osd/<node> > After that I ran this commands: > ceph-volume lvm activate --all > mkdir /root/mon-store > ceph-objectstore-tool --data-path /var/lib/ceph/osd/ceph-0 --no-mon-config > --op update-mon-db --mon-store-path mon-store/ > ceph-monstore-tool mon-store/ rebuild -- --keyring > /etc/pve/priv/ceph.client.admin.keyring --mon-ids pve01 pve02 pve03 > mv /var/lib/ceph/mon/ceph-pve01/store.db/ > /var/lib/ceph/mon/ceph-pve01/store.db-bkp > cp -rf mon-store/store.db/ /var/lib/ceph/mon/ceph-pve01/ > chown -R ceph:ceph /var/lib/ceph/mon/ceph-pve01/store.db > > But now I got nothing! > No monitor, no manager, no osd, none! > > Perhaps somebody point me what I did wrong. > > Thanks > > Em qua., 20 de ago. de 2025 às 11:32, Gilberto Ferreira < > gilberto.nunes32@gmail.com> escreveu: > >> I can see the content of the mentioned folders just after issue the >> command ceph-volume.... >> Thanks anyway. >> >> >> >> Em qua., 20 de ago. de 2025 às 11:26, Eugen Block <eblock@nde.ag> >> escreveu: >> >>> I assume you're right. Do you see the OSD contents in >>> /var/lib/ceph/osd/ceph-pve01 after activating? >>> And remember to collect the clustermap from all OSDs for this >>> procedure to succeed. >>> >>> Zitat von Gilberto Ferreira <gilberto.nunes32@gmail.com>: >>> >>> > I see... >>> > >>> > But I had another problem. >>> > The script from (0) indicate that should be exist a /var/lib/ceph/osd >>> > folder, like: >>> > /var/lib/ceph/osd/ceph-pve01 >>> > /var/lib/ceph/osd/ceph-pve02 >>> > and so on. >>> > >>> > But this folder appears only if I run ceph-volume lvm activate --all. >>> > So my question is: when I should run this command: after or before use >>> the >>> > script? >>> > I think I need to run ceph-volume lvm activate --all, right? >>> > Just to clarify. >>> > >>> > Thanks >>> > >>> > Em qua., 20 de ago. de 2025 às 11:08, Eugen Block < eblock@nde.ag> >>> escreveu: >>> > >>> >> 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] >>> >> >> >>> >> >> >>> >> >>>
>>> >> >> >>> >> >> 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
https://docs.ceph.com/en/latest/rados/troubleshooting/troubleshooting-mon/#r... 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 >>> >> >>> >> >>> >> _______________________________________________ >>> >> 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 >>> >> > _______________________________________________ > ceph-users mailing list -- ceph-users@ceph.io > To unsubscribe send an email to ceph-users-leave@ceph.io
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