[nova][neutron][oslo][ops][kolla] rabbit bindings issue

Fabian Zimmermann dev.faz at gmail.com
Fri Aug 14 11:21:04 UTC 2020

Hello again,

just a short update about the results of my tests.

I currently see 2 ways of running openstack+rabbitmq

1. without durable-queues and without replication - just one
rabbitmq-process which gets (somehow) restarted if it fails.
2. durable-queues and replication

Any other combination of these settings leads to more or less issues with

* broken / non working bindings
* broken queues

I think vexxhost is running (1) with their openstack-operator - for reasons.

I added [kolla], because kolla-ansible is installing rabbitmq with
replication but without durable-queues.

May someone point me to the best way to document these findings to some
official doc?
I think a lot of installations out there will run into issues if - under
load - a node fails.


Am Do., 13. Aug. 2020 um 15:13 Uhr schrieb Fabian Zimmermann <
dev.faz at gmail.com>:

> Hi,
> just did some short tests today in our test-environment (without durable
> queues and without replication):
> * started a rally task to generate some load
> * kill-9-ed rabbitmq on one node
> * rally task immediately stopped and the cloud (mostly) stopped working
> after some debugging i found (again) exchanges which had bindings to
> queues, but these bindings didnt forward any msgs.
> Wrote a small script to detect these broken bindings and will now check if
> this is "reproducible"
> then I will try "durable queues" and "durable queues with replication" to
> see if this helps. Even if I would expect
> rabbitmq should be able to handle this without these "hidden broken
> bindings"
> This just FYI.
>  Fabian
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