Hi Janek,
What version of Ceph are you using?
We also have a much smaller cluster running Nautilus, with no MDS. No
Prometheus issues there.
I won't speculate further than this but perhaps Nautilus doesn't have the
same issue as Mimic?
On Fri, Mar 20, 2020 at 12:23 PM Janek Bevendorff <
janek.bevendorff(a)uni-weimar.de> wrote:
I think this is related to my previous post to this
list about MGRs
failing regularly and being overall quite slow to respond. The problem
has existed before, but the new version has made it way worse. My MGRs
keep dyring every few hours and need to be restarted. the Promtheus
plugin works, but it's pretty slow and so is the dashboard.
Unfortunately, nobody seems to have a solution for this and I wonder why
not more people are complaining about this problem.
On 20/03/2020 19:30, Paul Choi wrote:
If I "curl
http://localhost:9283/metrics" and wait sufficiently long
enough, I get this - says "No MON connection". But the mons are health
and
the cluster is functioning fine.
That said, the mons' rocksdb sizes are fairly big because there's lots of
rebalancing going on. The Prometheus endpoint hanging seems to happen
regardless of the mon size anyhow.
mon.woodenbox0 is 41 GiB >= mon_data_size_warn (15 GiB)
mon.woodenbox2 is 26 GiB >= mon_data_size_warn (15 GiB)
mon.woodenbox4 is 42 GiB >= mon_data_size_warn (15 GiB)
mon.woodenbox3 is 43 GiB >= mon_data_size_warn (15 GiB)
mon.woodenbox1 is 38 GiB >= mon_data_size_warn (15 GiB)
# fg
curl -H "Connection: close"
http://localhost:9283/metrics
<!DOCTYPE html PUBLIC
"-//W3C//DTD XHTML 1.0 Transitional//EN"
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html;
charset=utf-8"></meta>
<title>503 Service Unavailable</title>
<style type="text/css">
#powered_by {
margin-top: 20px;
border-top: 2px solid black;
font-style: italic;
}
#traceback {
color: red;
}
</style>
</head>
<body>
<h2>503 Service Unavailable</h2>
<p>No MON connection</p>
<pre id="traceback">Traceback (most recent call last):
File "/usr/lib/python2.7/dist-packages/cherrypy/_cprequest.py", line
670,
in respond
response.body = self.handler()
File "/usr/lib/python2.7/dist-packages/cherrypy/lib/encoding.py", line
217, in __call__
self.body = self.oldhandler(*args, **kwargs)
File "/usr/lib/python2.7/dist-packages/cherrypy/_cpdispatch.py", line
61,
in __call__
return self.callable(*self.args, **self.kwargs)
File "/usr/lib/ceph/mgr/prometheus/module.py", line 704, in metrics
return self._metrics(instance)
File "/usr/lib/ceph/mgr/prometheus/module.py", line 721, in _metrics
raise cherrypy.HTTPError(503, 'No MON connection')
HTTPError: (503, 'No MON connection')
</pre>
<div id="powered_by">
<span>
Powered by <a href="http://www.cherrypy.org">CherryPy
3.5.0</a>
</span>
</div>
</body>
</html>
On Fri, Mar 20, 2020 at 6:33 AM Paul Choi <pchoi(a)nuro.ai> wrote:
> Hello,
>
> We are running Mimic 13.2.8 with our cluster, and since upgrading to
> 13.2.8 the Prometheus plugin seems to hang a lot. It used to respond
under
> 10s but now it often hangs. Restarting the
mgr processes helps
temporarily
> but within minutes it gets stuck again.
>
> The active mgr doesn't exit when doing `systemctl stop ceph-mgr.target"
> and needs to
> be kill -9'ed.
>
> Is there anything I can do to address this issue, or at least get better
> visibility into the issue?
>
> We only have a few plugins enabled:
> $ ceph mgr module ls
> {
> "enabled_modules": [
> "balancer",
> "prometheus",
> "zabbix"
> ],
>
> 3 mgr processes, but it's a pretty large cluster (near 4000 OSDs) and
it's
> a busy one with lots of rebalancing. (I
don't know if a busy cluster
would
seriously
affect the mgr's performance, but just throwing it out there)
services:
mon: 5 daemons, quorum
woodenbox0,woodenbox2,woodenbox4,woodenbox3,woodenbox1
mgr: woodenbox2(active), standbys: woodenbox0, woodenbox1
mds: cephfs-1/1/1 up {0=woodenbox6=up:active}, 1 up:standby-replay
osd: 3964 osds: 3928 up, 3928 in; 831 remapped pgs
rgw: 4 daemons active
Thanks in advance for your help,
-Paul Choi
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