11 Dec
2020
11 Dec
'20
3:37 p.m.
Hi Ken,
This seems to have fixed that issue. It exposed another:
https://tracker.ceph.com/issues/39264 which is causing ceph-mgr to become
entirely unresponsive across the cluster, but cheroot seems to be ok.
David
On Wed, Dec 9, 2020 at 12:25 PM David Orman <ormandj(a)corenode.com> wrote:
Ken,
We have rebuilt the container images of 15.2.7 with this RPM applied, and
will be deploying it to a larger (504 OSD) cluster to test - this cluster
had the issue previously until we disabled polling via Prometheus. We will
update as soon as it's run for a day or two and we've been able to verify
the mgr issues we saw no longer occur after extended polling via external
and internal prometheus instances.
Thank you again for the quick update, we'll let you know as soon as we
have more feedback,
David
On Tue, Dec 8, 2020 at 10:37 AM David Orman <ormandj(a)corenode.com> wrote:
> Hi Ken,
>
> Thank you for the update! As per:
> https://github.com/ceph/ceph-container/issues/1748
>
> We implemented the (dropping ulimit to 1024:4096 for mgr) suggested
> change last night, and on our test cluster of 504 OSDs, being polled by the
> internal prometheus and our external instance, the mgrs stopped responding
> and dropped out of the cluster entirely. This is impacting not just
> metrics, but the mgr itself. I think this is a high priority issue, as
> metrics are critical for prod, but mgr itself seems to be impacted on a
> moderately sized cluster.
>
> Respectfully,
> David Orman
>
> On Mon, Dec 7, 2020 at 1:50 PM Ken Dreyer <kdreyer(a)redhat.com> wrote:
>
>> Thanks for bringing this up.
>>
>> We need to update Cheroot in Fedora and EPEL 8. I've opened
>> https://src.fedoraproject.org/rpms/python-cheroot/pull-request/3 to
>> get this into Fedora first.
>>
>> I've published an el8 RPM at
>> https://fedorapeople.org/~ktdreyer/bz1868629/ for early testing. I can
>> bring up a "hello world" cherrypy app with this, but I've not
tested
>> it with Ceph.
>>
>> - Ken
>>
>> On Mon, Dec 7, 2020 at 9:57 AM David Orman <ormandj(a)corenode.com> wrote:
>> >
>> > Hi,
>> >
>> > We have a ceph 15.2.7 deployment using cephadm under podman w/ systemd.
>> > We've run into what we believe is:
>> >
>> > https://github.com/ceph/ceph-container/issues/1748
>> > https://tracker.ceph.com/issues/47875
>> >
>> > In our case, eventually the mgr container stops emitting
>> output/logging. We
>> > are polling with external prometheus clusters, which is likely what
>> > triggers the issue, as it appears some amount of time after the
>> container
>> > is spawned.
>> >
>> > Unfortunately, setting limits in the systemd service file for the mgr
>> > service on the host OS doesn't work, nor does modifying the unit.run
>> file
>> > which is used to start the container under podman to include the
>> --ulimit
>> > settings as suggested. Looking inside the container:
>> >
>> > lib/systemd/system/ceph-mgr@.service:LimitNOFILE=1048576
>> >
>> > This prevents us from deploying medium to large ceph clusters, so I
>> would
>> > argue it's a high priority bug that should not be closed, unless there
>> is a
>> > workaround that works until EPEL 8 contains the fixed version of
>> cheroot
>> > and the ceph containers include it.
>> >
>> > My understanding is this was fixed in cheroot 8.4.0:
>> >
>> > https://github.com/cherrypy/cheroot/issues/249
>> > https://github.com/cherrypy/cheroot/pull/301
>> >
>> > Thank you in advance for any suggestions,
>> > David
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>> >
>>
>>