It can work, but it might be necessary to modify the monmap first,
since it's complaining that it has been removed from it. Are you
familiar with the monmap-tool
(https://docs.ceph.com/en/latest/man/8/monmaptool/)?
The procedure is similar to changing a monitor's IP address the "messy
way"
(https://docs.ceph.com/en/latest/rados/operations/add-or-rm-mons/#changing-a-monitor-s-ip-address-advanced-method).
I also wrote a blog post how to do it with cephadm:
https://heiterbiswolkig.blogs.nde.ag/2020/12/18/cephadm-changing-a-monitors-ip-address/
But before changing anything, I'd inspect first what the current
status is. You can get the current monmap from within the mon
container (is it still there?):
cephadm shell --name mon.<mon>
ceph-monstore-tool /var/lib/ceph/mon/<your_mon> get monmap -- --out monmap
monmaptool --print monmap
You can paste the output here, if you want.
Zitat von Jonas Schwab <jonas.sch...@uni-wuerzburg.de>:
I realized, I have access to a data directory of a monitor I removed
just before the oopsie happened. Can I launch a ceph-mon from that? If I
try just to launch ceph-mon, it commits suicide:
2025-04-10T19:32:32.174+0200 7fec628c5e00 -1 mon.mon.ceph2-01@-1(???)
e29 not in monmap and have been in a quorum before; must have been removed
2025-04-10T19:32:32.174+0200 7fec628c5e00 -1 mon.mon.ceph2-01@-1(???)
e29 commit suicide!
2025-04-10T19:32:32.174+0200 7fec628c5e00 -1 failed to initialize
On 2025-04-10 16:01, Jonas Schwab wrote:
Hello everyone,
I believe I accidentally nuked all monitor of my cluster (please don't
ask how). Is there a way to recover from this desaster? I have a cephadm
setup.
I am very grateful for all help!
Best regards,
Jonas Schwab
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--
Jonas Schwab
Research Data Management, Cluster of Excellence ct.qmat
https://data.ctqmat.de | datamanagement.ct.q...@listserv.dfn.de
Email: jonas.sch...@uni-wuerzburg.de
Tel: +49 931 31-84460
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