[ceph-users] Luminous cluster stuck when adding monitor

Nico Schottelius nico.schottelius at ungleich.ch
Wed Oct 4 13:05:16 PDT 2017

Some more detail:

when restarting the monitor on server1, it stays in synchronizing state

However the other two monitors change into electing state.

I have double checked that there are not (host) firewalls active and
that the times are within 1 second different of the hosts (they all have
ntpd running).

We are running everything on IPv6, but this should not be a problem,
should it?



Nico Schottelius <nico.schottelius at ungleich.ch> writes:

> Hello Gregory,
> the logfile I produced has already debug mon = 20 set:
> [21:03:51] server1:~# grep "debug mon" /etc/ceph/ceph.conf
> debug mon = 20
> It is clear that server1 is out of quorum, however how do we make it
> being part of the quorum again?
> I expected that the quorum finding process is triggered automatically
> after restarting the monitor, or is that incorrect?
> Best,
> Nico
> Gregory Farnum <gfarnum at redhat.com> writes:
>> You'll need to change the config so that it's running "debug mon = 20" for
>> the log to be very useful here. It does say that it's dropping client
>> connections because it's been out of quorum for too long, which is the
>> correct behavior in general. I'd imagine that you've got clients trying to
>> connect to the new monitor instead of the ones already in the quorum and
>> not passing around correctly; this is all configurable.
>> On Wed, Oct 4, 2017 at 4:09 AM Nico Schottelius <
>> nico.schottelius at ungleich.ch> wrote:
>>> Good morning,
>>> we have recently upgraded our kraken cluster to luminous and since then
>>> noticed an odd behaviour: we cannot add a monitor anymore.
>>> As soon as we start a new monitor (server2), ceph -s and ceph -w start to
>>> hang.
>>> The situation became worse, since one of our staff stopped an existing
>>> monitor (server1), as restarting that monitor results in the same
>>> situation, ceph -s hangs until we stop the monitor again.
>>> We kept the monitor running for some minutes, but the situation never
>>> cleares up.
>>> The network does not have any firewall in between the nodes and there
>>> are no host firewalls.
>>> I have attached the output of the monitor on server1, running in
>>> foreground using
>>> root at server1:~# ceph-mon -i server1 --pid-file
>>> /var/lib/ceph/run/mon.server1.pid -c /etc/ceph/ceph.conf --cluster ceph
>>> --setuser ceph --setgroup ceph -d 2>&1 | tee cephmonlog
>>> Does anyone see any obvious problem in the attached log?
>>> Any input or hint would be appreciated!
>>> Best,
>>> Nico
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