[ClusterLabs] clutering rabbitmq

[Damiano Giuliani]

I Ken, thanks for answering.
Yes unfortunately the rabbitmq-cluster agent wipe everything and losing our
quorum queue is not an option 😄 we just learnt after a power interrupion
this! I was super confident about the agent really didn't expected a
complete wipe and rebuild!lession learned!

If somebody con join the conversation and share how achieve high
availability rabbimq with pacemaker helping me I would really appreciate!

On Mon, Jun 24, 2024, 5:19 PM Ken Gaillot <kgaillot at redhat.com> wrote:

> Hi,
>
> The rabbitmq-cluster agent was written specifically for the OpenStack
> use case, which is fine with recreating the cluster from scratch after
> problems. I'm not sure about the other two, and I'm not really familiar
> with any of the agents. Hopefully someone with more experience with
> RabbitMQ can jump in.
>
> On Thu, 2024-06-20 at 10:33 +0200, Damiano Giuliani wrote:
> > Hi,
> >
> > hope you guys can help me,
> >
> > we have builded up a rabbitmq cluster using pacemaker resource called
> > rabbitmq-cluster.
> > everything works as exptected till for maintenance reason, we shutted
> > down the entire cluster gracefully.
> > at the startup we noticed all the user and permissions were dropped
> > and probably also the quorum queues.
> > So investigating the resource agent (rabbitmq-cluster), i find out it
> > callss this wipe function
> >
> > rmq_wipe_data()
> > {
> > rm -rf $RMQ_DATA_DIR > /dev/null 2>&1
> > }
> >
> > when the first start function is called
> >
> > rmq_start_first()
> > {
> > local rc
> >
> > ocf_log info "Bootstrapping rabbitmq cluster"
> > rmq_wipe_data
> > rmq_init_and_wait
> > rc=$?
> >
> > So probably when all the cluster is fired up by pacemaker all the
> > rabbitmq istances are wiped out.
> >
> > the rabbitmq-cluster is quite old (3-4yo) and probably didnt take
> > into account quorum queues which are presistent, so a full wipe is
> > not acceptable.
> >
> > So i moved to the RA called rabbitmq-server-ha which is quite huge
> > and big script but im a bit lost because i notice also this one seems
> > cleans mnesia folder.
> >
> > So the third and last one is the RA rabbitmq-server  which seems
> > simple resoruce but not manage cluster status but only simple actions
> > like start stop etc.
> > i could probably build the cluster using this one + rabbitmq.conf
> > file where i defined cluster istances, something like this.
> >
> https://www.rabbitmq.com/docs/cluster-formation#peer-discovery-classic-config
> >
> > so im a bit lost because seems there is no easy way to build up a
> > rabbitmq cluster using pacemaker.
> >
> > can you guys help me heading on the correct way?
> >
> > thanks
> >
> > Damiano
> >
> >
> >
> >
> > _______________________________________________
> > Manage your subscription:
> > https://lists.clusterlabs.org/mailman/listinfo/users
> >
> > ClusterLabs home: https://www.clusterlabs.org/
> --
> Ken Gaillot <kgaillot at redhat.com>
>
> _______________________________________________
> Manage your subscription:
> https://lists.clusterlabs.org/mailman/listinfo/users
>
> ClusterLabs home: https://www.clusterlabs.org/
>
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <https://lists.clusterlabs.org/pipermail/users/attachments/20240625/3d9bec75/attachment.htm>