[Openstack-operators] Way to check compute <-> rabbitmq connectivity

Gustavo Randich gustavo.randich at gmail.com
Thu Jan 15 18:53:09 UTC 2015

Just to add one more background scenario, we also had similar problems
trying to load balance rabbitmq via F5 Big IP LTM. For that reason we don't
use it now. Our installation is a single rabbitmq instance and no
intermediaries (albeit network switches). We use Folsom and Icehouse, the
problem being perceived more in Icehouse nodes.

We are already monitoring message queue size, but we would like to pinpoint
in semi-realtime the specific hosts/racks/network paths experiencing the
"stale connection" before a user complains about an operation being stuck,
or even hosts with no such pending operations but already "disconnected" --
we also could diagnose possible network causes and avoid massive service

So, for now, if someone knows about a cheap and quick openstack operation
that triggers a message interchange between rabbitmq and nova-compute and a
way of checking the result it would be great.

On Thu, Jan 15, 2015 at 1:45 PM, Kris G. Lindgren <klindgren at godaddy.com>

>  We did have an issue using celery  on an internal application that we
> wrote - but I believe it was fixed after much failover testing and code
> changes.  We also use logstash via rabbitmq and haven't noticed any issues
> there either.
>  So this seems to be just openstack/oslo related.
>  We have tried a number of different configurations - all of them had
> their issues.  We started out listing all the members in the cluster on the
> rabbit_hosts line.  This worked most of the time without issue, until we
> would restart one of the servers, then it seemed like the clients wouldn't
> figure out they were disconnected and reconnect to the next host.
>  In an attempt to solve that we moved to using harpoxy to present a vip
> that we configured in the rabbit_hosts line.  This created issues with long
> lived connections disconnects and a bunch of other issues.  In our
> production environment we moved to load balanced rabbitmq, but using a real
> loadbalancer, and don't have the weird disconnect issues.  However, anytime
> we reboot/take down a rabbitmq host or pull a member from the cluster we
> have issues, or if their is a network disruption we also have issues.
>  Thinking the best course of action is to move rabbitmq off on to its own
> box and to leave it alone.
>  Does anyone have a rabbitmq setup that works well and doesn't have
> random issues when pulling nodes for maintenance?
>  ____________________________________________
> Kris Lindgren
> Senior Linux Systems Engineer
> GoDaddy, LLC.
>   From: Joe Topjian <joe at topjian.net>
> Date: Thursday, January 15, 2015 at 9:29 AM
> To: "Kris G. Lindgren" <klindgren at godaddy.com>
> Cc: "openstack-operators at lists.openstack.org" <
> openstack-operators at lists.openstack.org>
> Subject: Re: [Openstack-operators] Way to check compute <-> rabbitmq
> connectivity
>   Hi Kris,
>     Our experience is pretty much the same on anything that is using
>> rabbitmq - not just nova-compute.
>  Just to clarify: have you experienced this outside of OpenStack (or
> Oslo)?
>  We've seen similar issues with rabbitmq and OpenStack. We used to run
> rabbit through haproxy and tried a myriad of options like setting no
> timeouts, very very long timeouts, etc, but would always eventually see
> similar issues as described.
>  Last month, we reconfigured all OpenStack components to use the
> `rabbit_hosts` option with all nodes in our cluster listed. So far this has
> worked well, though I probably just jinxed myself. :)
>  We still have other services (like Sensu) using the same rabbitmq
> cluster and accessing it through haproxy. We've never had any issues there.
>  What's also strange is that I have another OpenStack deployment (from
> Folsom to Icehouse) with just a single rabbitmq server installed directly
> on the cloud controller (meaning: no nova-compute). I never have any rabbit
> issues in that cloud.
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