Hi to all!
We are running a Ceph cluster (Octopus) on (99%) CentOS 7 (deployed at
the time with ceph-deploy) and we would like to upgrade it. As far as I
know for Pacific (and later releases) there aren't packages for CentOS 7
distribution (at least not on download.ceph.com), so we need to upgrade
(change) not only Ceph but also the distribution.
What is the raccomended path to do so?
We could upgrade (reinstall) all the nodes to Rocky 8 and then upgrade
Ceph to Quincy, but we will "stuck" with "not the latest" distribution
and probably we will have to upgrade (reinstall) again in the near future.
Our second idea is to leverage cephadm (which we would like to
implement) and switch from rpms to containers, but I don't have a clear
vision of how to do it. I was thinking to:
1. install a new monitor/manager with Rocky 9.
2. prepare the node for cephadm.
3. start the manager/monitor containers on that node.
4. repeat for the other monitors.
5. repeat for the OSD servers.
I'm not sure how to execute the point 2 and 3. The documentation says
how to bootstrap a NEW cluster and how to ADOPT an existing one, but our
situation is a hybrid (or in my mind it is...).
I cannot also adopt my current cluster to cephadm because we have 30% of
our OSD still on filestore. My intention was to drain them, reinstall
them and then adopt them. But I would like to avoid (if not necessary)
multiple reinstallations. In my mind all the OSD servers will be drained
before been reinstalled, just to be sure to have a "fresh" start).
Have you any ideas and/or advice to give us?
Thanks a lot!
Iztok
P.S. I saw that the script cephadm doesn't support Rocky, I can modify
it to do so and it should work, but is there a plan to officially
support it?
--
Iztok Gregori
ICT Systems and Services
Elettra - Sincrotrone Trieste S.C.p.A.
Telephone: +39 040 3758948
http://www.elettra.eu
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