[rabbitmq-discuss] RABBITMQ_NODENAME

Marek Majkowski majek04 at gmail.com
Wed Jul 14 18:19:49 BST 2010

On Wed, Jul 14, 2010 at 17:37, Ovidiu Deac <ovidiudeac at gmail.com> wrote:
> Can somebody explain what is RABBITMQ_NODENAME and when is it used?

RabbitMQ is build using Erlang. Erlang is a programming language, but actually
it's way more than that.

Erlang runs in a virtual machine (you can think about it as JVM (java
virtual machine) but for erlang). Every virtual machine is named.
RABBITMQ_NODENAME sets that name.

This name allows you to:
 - make sure that only one instance of Rabbit is running
   (there can't be two erlang vm's with the same name)
 - connect remotely to Rabbit instance
   (you can open a new terminal, type a magic command and
    get access to live rabbitmq instance. you could see statistics,
    run any code, or maybe even do a live code upgrade!)
 - connect remote tools, for example 'rabbitmqctl' connects
    to a specified node, gets statistics and prints them on the screen.

You can also say that erlang node name (RABBITMQ_NODENAME)
is used to identify that particular Rabbitmq instance.

Some pointer to erlang documentation:

Hope that helps.

  Marek Majkowski

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