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What is RabbitMQ?
RabbitMQ is open source message broker software (sometimes called message-oriented middleware) that implements the Advanced Message Queuing Protocol (AMQP). The RabbitMQ server is written in the Erlang programming language and is built on the Open Telecom Platform framework for clustering and failover. Client libraries to interface with the broker are available for all major programming languages.
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How to use this image
Running the daemon
One of the important things to note about RabbitMQ is that it stores data based on what it calls the "Node Name", which defaults to the hostname. What this means for usage in Docker is that we should either specify -h/--hostname or -e RABBITMQ_NODENAME=... explicitly for each daemon so that we don't get a random hostname and can keep track of our data:
docker run -d -e RABBITMQ_NODENAME=my-rabbit --name some-rabbit rabbitmq:3
If you give that a minute, then do docker logs some-rabbit, you'll see in the output a block similar to:
=INFO REPORT==== 31-Dec-2014::23:21:09 ===
node : my-rabbit@988c28b0eb2e
home dir : /var/lib/rabbitmq
config file(s) : /etc/rabbitmq/rabbitmq.config (not found)
cookie hash : IFQiLgiJ4goGJrdsLJvN7A==
log : undefined
sasl log : undefined
database dir : /var/lib/rabbitmq/mnesia/my-rabbit
Note the database dir there, especially that it has my RABBITMQ_NODENAME appended to the end for the file storage. This image makes all of /var/lib/rabbitmq a volume by default.
Management Plugin
There is a second set of tags provided with the management plugin installed and enabled by default, which is available on the standard management port of 15672, with the default username and password of guest / guest:
docker run -d -e RABBITMQ_NODENAME=my-rabbit --name some-rabbit rabbitmq:3-management
You can access it by visiting http://container-ip:15672 in a browser or, if you need access outside the host, on port 8080:
docker run -d -e RABBITMQ_NODENAME=my-rabbit --name some-rabbit -p 8080:15672 rabbitmq:3-management
You can then go to http://localhost:8080 or http://host-ip:8080 in a browser.
Connecting to the daemon
docker run --name some-app --link some-rabbit:rabbit -d application-that-uses-rabbitmq