RabbitMQ and docker-compose

[Tianxiang Xiong]

I have a Dockefile for RabbitMQ as follows:

FROM rabbitmq:3.6.2-management

# RabbitMQ configs
ADD resources/rabbitmq/rabbitmq.config /etc/rabbitmq/
ADD resources/rabbitmq/definitions.json /etc/rabbitmq/

# rabbitmqadmin
RUN apt-get update && apt-get install -y python
ADD https://raw.githubusercontent.com/rabbitmq/rabbitmq-management/rabbitmq_v3_6_2/bin/rabbitmqadmin /usr/bin/rabbitmqadmin
RUN chmod u+x /usr/bin/rabbitmqadmin

CMD ["rabbitmq-server"]

I also have a docker-compose file as follows:

version: '2'
services:
  rabbitmq:
    build:
      context: .
      dockerfile: docker/Dockerfile_rabbitmq.yml
    expose:
      - 5672
      - 15672
     
  rabbitmq-tools:
    build:
      context: .
      dockerfile: docker/Dockerfile_rabbitmq.yml
    depends_on:
      - rabbitmq
    environment:
      - RABBITMQ_HOST=rabbitmq
      - RABBITMQ_PORT=5672
      - RABBITMQ_USERNAME=guest
      - RABBITMQ_PASSWORD=guest
      - RABBITMQ_VHOST=/
      - RABBITMQ_USE_SSL=false
    working_dir: /usr/src/app
    entrypoint: /bin/bash

The rabbitmq.config file is as follows:

[
 {rabbit, [
           {loopback_users, []},
           {password_hashing_module, rabbit_password_hashing_md5},
           {tcp_listeners, [5672]}
          ]},
 {rabbitmq_management, [
                        { listener, [
                                     { port, 15672 },
                                     { ssl, false }
                                    ]
                        },
                        {load_definitions, "/etc/rabbitmq/definitions.json"}
                       ]}
].

The definitions.json file is as follows, with the password has redacted and app name changed to my-app:

{
  "rabbit_version": "3.6.2",
  "users": [
    {
      "name": "guest",
      "password_hash": "<hash>",
      "tags": "administrator"
    }
  ],
  "vhosts": [
    {
      "name": "/"
    }
  ],
  "permissions": [
    {
      "user": "guest",
      "vhost": "/",
      "configure": ".*",
      "write": ".*",
      "read": ".*"
    }
  ],
  "parameters": [],
  "policies": [],
  "queues": [
    {
      "name": "default",
      "vhost": "/",
      "durable": true,
      "auto_delete": false,
      "arguments": {}
    },
    {
      "name": "my-app.placeholder_consumer",
      "vhost": "/",
      "durable": true,
      "auto_delete": false,
      "arguments": {}
    }
  ],
  "exchanges": [
    {
      "name": "standard",
      "vhost": "/",
      "type": "topic",
      "durable": true,
      "auto_delete": false,
      "internal": false,
      "arguments": {}
    }
  ],
  "bindings": [
    {
      "source": "standard",
      "vhost": "/",
      "destination": "my-app.placeholder_consumer",
      "destination_type": "queue",
      "routing_key": "my-app.placeholder",
      "arguments": {}
    }
  ]
}

After doing docker-compose up -d, I can drop down into the rabbitmq container and use rabbitmqctl status to see that the node is up. When I docker-compse run rabbitmq-tools and run rabbitmqctl -n rabbit@rabbitmq status, however, I get:

Status of node rabbit@rabbitmq ...
Error: unable to connect to node rabbit@rabbitmq: nodedown

DIAGNOSTICS
===========

attempted to contact: [rabbit@rabbitmq]

rabbit@rabbitmq:
  * connected to epmd (port 4369) on rabbitmq
  * epmd reports node 'rabbit' running on port 25672
  * TCP connection succeeded but Erlang distribution failed
  * suggestion: hostname mismatch?
  * suggestion: is the cookie set correctly?
  * suggestion: is the Erlang distribution using TLS?

current node details:
- node name: 'rabbitmq-cli-17@0a0f25e326dd'
- home dir: /var/lib/rabbitmq
- cookie hash: <some hash>

I'm don't think there's a hostname mismatch issue here, and the RabbitMQ image should be using TLS, right? So I guess it might be a cookie issue? I'd like some advice on debugging this.

[Michael Klishin]

It is a cookie or hostname mismatch 99% of the time.

--
You received this message because you are subscribed to the Google Groups "rabbitmq-users" group.
To unsubscribe from this group and stop receiving emails from it, send an email to rabbitmq-users+unsubscribe@googlegroups.com.
To post to this group, send email to rabbitmq-users@googlegroups.com.
For more options, visit https://groups.google.com/d/optout.

--

MK

Staff Software Engineer, Pivotal/RabbitMQ