[ClusterLabs] clutering rabbitmq

[Ken Gaillot]

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
> 
> 
> 
> 
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-- 
Ken Gaillot <kgaillot at redhat.com>