How to create a queue in RabbitMQ upon startup

I am trying to start RMQ inside docker container, with precreated queue qwer.

Prior to this, I was using simple docker-compose.yml file:

rabbit:
    image: rabbitmq:management-alpine
    environment:
      RABBITMQ_DEFAULT_USER: guest
      RABBITMQ_DEFAULT_PASS: guest

And it worked fine, except that it has no queues pre-created at start. Now I've switched to custom image, with following Dockerfile:

FROM rabbitmq:management-alpine

ADD rabbitmq.conf /etc/rabbitmq/
ADD definitions.json /etc/rabbitmq/

RUN chown rabbitmq:rabbitmq /etc/rabbitmq/rabbitmq.conf /etc/rabbitmq/definitions.json

where rabbitmq.conf is v3.7+ sysctl-styled config, with line:

management.load_definitions = /etc/rabbitmq/definitions.json

and definitions.json contains attempt to create queue:

{
    "vhosts":[
        {"name":"/"}
    ],
    "queues":[
        {"name":"qwer","vhost":"/","durable":true,"auto_delete":false,"arguments":{}}
    ]
}

Now it started to refuse login:

Error on AMQP connection <0.660.0> (172.18.0.6:48916 -> 172.18.0.10:5672, state: starting):
PLAIN login refused: user 'guest' - invalid credentials

I thought that the task is somewhat simple, but configuration process of rabbit itself is most complex task, and documentation is somewhat unclear.

I was unable to figure out how should it work, even after 4 days of trials and googling..

Could you help me, how to write configuration file, in order to create a queue and preserve ability to connect and talk to it?

You are almost there actually.

RabbitMQ has a rule that the "guest" user can only connect from localhost. Since you are running it on a docker, I'm assuming you are trying to access it from outside by exposing port "15672" by doing: docker run <rabbitmq-docker-img> -p 15672:15672

So to get around this, what you have to do is create a user with admin privileges.

Firstly, change this:

rabbit:
    image: rabbitmq:management-alpine
    environment:
      RABBITMQ_DEFAULT_USER: user
      RABBITMQ_DEFAULT_PASS: password

You can use ath, I used user/password as your user/password.

In your Dockerfile, you can add: EXPOSE 15672 If you don't want to expose each time you run.

Lastly, make amends to your definitions.json file as follows:

{
    "users": [
      {
        "name": "user",  
        "password_hash": "password",
        "hashing_algorithm": "rabbit_password_hashing_sha256",
        "tags": "administrator"
      }
    ],

    "vhosts":[
        {"name":"/"}
    ],
    "queues":[
        {"name":"qwer","vhost":"/","durable":true,"auto_delete":false,"arguments":{}}
    ]
}

Let me know how it goes!

Check out this link

Use this Dockerfile:

FROM rabbitmq

# Define environment variables.
ENV RABBITMQ_USER user
ENV RABBITMQ_PASSWORD password

ADD init.sh /init.sh
EXPOSE 15672

# Define default command
CMD ["/init.sh"]

And use this init.sh:

#!/bin/sh

# Create Rabbitmq user
( sleep 5 ; \
rabbitmqctl add_user $RABBITMQ_USER $RABBITMQ_PASSWORD 2>/dev/null ; \
rabbitmqctl set_user_tags $RABBITMQ_USER administrator ; \
rabbitmqctl set_permissions -p / $RABBITMQ_USER  ".*" ".*" ".*" ; \
echo "*** User '$RABBITMQ_USER' with password '$RABBITMQ_PASSWORD' completed. ***" ; \
echo "*** Log in the WebUI at port 15672 (example: http:/localhost:15672) ***") &

# $@ is used to pass arguments to the rabbitmq-server command.
# For example if you use it like this: docker run -d rabbitmq arg1 arg2,
# it will be as you run in the container rabbitmq-server arg1 arg2
rabbitmq-server $@