[rabbitmq-discuss] Best way to live migrate RabbitMQ consumer load from one cluster to another

[Matt Pietrek]

Pinging on this thread - No responses as of yet, and given other traffic
topics here, I'd think somebody would have some thoughts or opinions.

Thanks,

Matt


On Wed, Apr 30, 2014 at 10:49 AM, Matt Pietrek <mpietrek at skytap.com> wrote:

> Apologies if this has been answered somewhere already, but my searching
> isn't turning up anything.
>
> I'm looking for advice on how to best move client traffic from one
> RabbitMQ cluster to another without service interruption. I suspect it can
> be done with HA-proxy, but I can't figure out the steps. I'm open to other
> ideas as well.
>
> Scenario: We have a 2-node cluster with all queues mirrored. Let's say
> it's running RabbitMQ 3.2.2. Clients connect to this cluster through a VIP
> maintained by keepalived on both RabbitMQ hosts.
>
> We now want to move to a different identical cluster, but running 3.3.1.
> I'm thinking I can bring up this new cluster "side-by-side" with the old
> cluster, such that they're running concurrently. All new connections would
> go to the new cluster, while already established connections to the 3.2.2
> cluster will remain alive and working, until all clients have eventually
> connected to the new cluster. At that point the 3.2.2 cluster can be shut
> down.
>
> I have a hunch I can put HA-proxy in front of both clusters, and though
> live configuration changes have it migrate the traffic to the new cluster
> while leaving existing cluster connections alone. What I don't know is the
> commands/configuration options/steps to implement it.
>
> Thoughts and guidance on how to best do this?
>
> Thanks,
>
> Matt
>
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