Open Stack

Hi,

On 31/01/14 09:27, Papaspyrou, Alexander wrote:
> Subbu,
>
> we are running on RMQ 3.2 with server-side HA policy on all OpenStack
> queues.

This seems to be the key - we're also running a newer version of rabbit 
than is available in stock ubuntu 12.04, and we've seen no problems so 
far (knock wood).

> Even with two Rabbit servers dispersed over two sufficiently distant
> data centers (different subnets, different locations, connected via
> fibre over a number of routers), and besides network partitions here and
> there (which RMQ fixes automatically most of the time, if configured
> properly), our setup runs like a charm. Hardware is negligible; RMQ
> almost never goes beyond a GB or so of memory usage, and the CPU is
> usually bored to death.
>
> We found the DRBD setup much more flaky and rather cumbersome to setup,
> and frankly, I never understood why people happen to take the dark alley
> Linux-HA. If you want, you can put ldirectord in front of the two boxes
> to balance the load (we did that, although from a performance
> perspective, this is not necessary). ldirectord also detects whether one
> of the boxes is out to lunch (which never happened so far), and reroutes
> the traffic automatically.
>
> To be really sure, put a corosync/pacemaker-managed failover (virtual)
> IP in front of the two boxes, and run
> corosync/pacemaker/ldirectord/rabbitmq on each box, with properly
> configured VIP transportation – that’s where I’d invest the effort to
> dive into the details of Linux HA glory.

Most of the services can now be configured with a list of rabbit 
servers, so most of this becomes unnecessary - the clients will just 
reconnect to another host in the cluster if something goes wrong.

Cheers,
-- 
Stephen Gran
Senior Systems Integrator - theguardian.com
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