[rabbitmq-discuss] OOM kill

[Dmitry Andrianov]

I understand.

However only fixed limit policy can be easily implemented by 3rd party firewall. Only Rabbit itself can implement free-memory based policies when it stops accepting connection when memory drops below a threshold. (Well, firewall can of course poll Rabbit status regularly and change its behaviour based on current memory consumption but it does not look very reliable and also introduces a delay so won't be able to react on a sudden spike of connections)

Cheers

> On 8 Mar 2014, at 17:08, Matthias Radestock <matthias at rabbitmq.com> wrote:
> 
>> On 08/03/14 16:38, Dmitry Andrianov wrote:
>> I just know that server process dying completely is a very bad thing
>> to happen.
> 
> Indeed. but note that in your case the server didn't die off its own accord; it was bumped off by the OOM killer.
> 
> With ulimits, channel limits and buffer sizes configured carefully, and restrictions in place for exchange/binding/queue creation, you can certainly prevent rabbit from breaching memory limits.
> 
>> So if I was able to extend Rabbit, I would be thinking of adding
>> something like a limiting policy to every tcp listener. So for
>> internal port (inaccessible from internet) I would not set any limits
>> while on the ssl listener (accessible from the internet) I would
>> configure a limiting policy either with fixed limit (say 10k
>> connections) or memory-based policy (start limiting connections when
>> memory is low).
> 
> Right. This is achievable with common firewall products.
> 
>> Something like that. But from Michael's words I understand that it is
>> not something you need yourself or think is needed by the community
>> because it is not how Rabbit is supposed to be used.
> 
> We are in fact quite keen to improve rabbit to make it more bullet proof. We have long-standing bugs open in our tracker for the issues you raised. But any solution we come up with must a) cover a broad spectrum of use cases, b) not be easily handled by off-the-shelf companion products like firewalls.
> 
> Regards,
> 
> Matthias
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