Question 80751 in Docker Question posted in
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How to pass erlang.cookie in "docker run" after RABBITMQ_ERLANG_COOKIE got depricated

I want to start three RabbitMQ containers that will be joined together in a cluster. I want to keep it simple and not define complex Dockerfiles with specific volumes.
This is what I am doing right now:

docker network create rabbits
docker run -d --rm --net rabbits --hostname rabbit-1 --name rabbit-1 -p 8081:15672 -e RABBITMQ_ERLANG_COOKIE=ASDF rabbitmq:3.8-management
docker run -d --rm --net rabbits --hostname rabbit-2 --name rabbit-2 -p 8082:15672 -e RABBITMQ_ERLANG_COOKIE=ASDF rabbitmq:3.8-management
docker run -d --rm --net rabbits --hostname rabbit-3 --name rabbit-3 -p 8083:15672 -e RABBITMQ_ERLANG_COOKIE=ASDF rabbitmq:3.8-management

When I then try to tell the nodes to join each other with the following commands, I get an error message:

docker exec -it rabbit-2 rabbitmqctl stop_app
docker exec -it rabbit-2 rabbitmqctl reset
docker exec -it rabbit-2 rabbitmqctl join_cluster rabbit@rabbit-1
docker exec -it rabbit-2 rabbitmqctl start_app
docker exec -it rabbit-2 rabbitmqctl cluster_status

This results in:
RABBITMQ_ERLANG_COOKIE env variable support is deprecated and will be REMOVED in a future version. Use the $HOME/.erlang.cookie file or the --erlang-cookie switch instead.

However I do not know how to pass this switch. When I add this to the docker run command it does not work. So i thought maybe add this after the join_cluster command, but then the cookie is already set.

How do I need to change the docker run command?

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2

Answers


  1. 0

    In response to your and other questions about RABBITMQ_ERLANG_COOKIE, I opened this issue:

    https://github.com/rabbitmq/rabbitmq-server/issues/7262

    Currently you should use the environment variable and disregard the warning.

    The best practice is to use docker compose and your own image based off of the official RabbitMQ images:

    https://github.com/lukebakken/docker-rabbitmq-cluster/blob/main/docker-compose.yml

    https://github.com/lukebakken/docker-rabbitmq-cluster/blob/main/rmq/Dockerfile

    NOTE: the RabbitMQ team monitors the rabbitmq-users mailing list and only sometimes answers questions on StackOverflow.

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  2. 0

    The RABBITMQ_ERLANG_COOKIE environment variable is no longer used in RabbitMQ starting from version 3.7.0. Instead, you can set the Erlang cookie value by using the -e option in the docker run command and setting the RABBITMQ_ERLANG_COOKIE environment variable to your desired value. Here’s an example:

    docker run -d –name rabbitmq -e RABBITMQ_ERLANG_COOKIE=’your_cookie_value’ rabbitmq:3

    Alternatively, you can store the Erlang cookie in a file and mount it as a volume in your container. For example:

    Create a file named erlang.cookie with your desired cookie value

    echo ‘your_cookie_value’ > erlang.cookie

    Start the RabbitMQ container, mounting the erlang.cookie file

    docker run -d –name rabbitmq -v $(pwd)/erlang.cookie:/var/lib/rabbitmq/.erlang.cookie rabbitmq:3

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