[rabbitmq-discuss] Proper process to change erlang cookie?

[Alvaro Videla]

The Erlang cookie belongs to each particular user on your machines.
The cookie can be found on ~/.erlang.cookie and you need to have the same
value there for every node in the cluster.

start_app stops the Rabbit application inside the Erlang VM but the VM has
to be running for that to work.

stop_app will stop the rabbit app, but not the Erlang VM

rabbitmq-server takes care of preparing the env parameters and starting the
Erlang VM to then run RabbitMQ on it.

Regards,

Alvaro

On Friday, September 13, 2013, Ben Hsu wrote:

> Hello all
>
> I need to change the erlang cookie on my RabbitMQ server to get clustering
> working, and wish to know the correct procedure.
>
> I tried doing this:
>
> rabbitmqctl stop_app
> vi /var/lib/rabbitmq/.erlang.cookie
> rabbitmqctl start_app # this gave me an error message: *Error: unable to
> connect to node 'rabbit at ben-amqp-test4': nodedown*
>
> By trial and error, I found this worked:
> pkill beam
> pkill epmd
> vi /var/lib/rabbitmq/.erlang.cookie
> rabbitmq-server
> # now in a separate window, for some reason it didn't work with
> rabbitmq-server -detached
> rabbitmqctl start_app
>
> That seemed to work, but is ugly, and doesn't feel like the right way of
> doing it.
>
> Also, what is the difference between "rabbitmqctl start_app" and
> "rabbitmq-server"?
>
> Thanks in advance
>
> --
> Ben Hsu
> Sent with Airmail <http://airmailapp.com/tracking>
>
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