[rabbitmq-discuss] effectively using -setcookie

Wed May 22 20:05:23 BST 2013

Hi,

If I read the source code correctly, rabbitmq-server will accept arguments
that will be sent directly to erl, so you can use -setcookie there.

On the other hand rabbitmqctl expects an ENV var
called RABBITMQ_CTL_ERL_ARGS, so I guess you could pass -setcookie there.

And no, -setcookie won't change the value of .erlang_cookie; it's used
to override it.

Regards,

Alvaro

On Wed, May 22, 2013 at 8:54 PM, srd <srd at duneram.com> wrote:

> Hi,
> I'm using rabbit 3.0.4 on a centos system.
>
> Suppose I have a cluster I want to stand up and want to make it easy
> without having to copy the cookie file to all the nodes.
>
> If I run as rabbitmq the command: rabbitmq-server -setcookie pigcat &
> It appears to start fine however I have noticed a couple of things.
> the .erlang_cookie doesn't update.
>
> If I later run rabbitmqctl cluster_status  I can't to communicate with the
> node because I cannot set the cookie to my desired cookie.
>
> So the question is, how does one effectively maintain a cluster using the
> -setcookie option?
>
> I tried looking at the rabbitmqctl and rabbitmq-server script files but
> none of them hit the erl application directly.  In the docs it briefly
> mentions one could modify the scripts so that erl is started with a
> specific cookie.
> I'd like to be able to do this but do not see where it would be that I
> need to augment so I can ensure the cookie is always set to a known value
> when accessing the node.
>
> Does anyone have an example of how / what scripts need to be modified?
>
> Thanks in advance.
>
>
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