Support for Docker Swarm

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Muhammad Rehan Saeed

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Mar 5, 2018, 11:54:11 AM3/5/18

to rabbitmq-users

I'm trying to get RabbitMQ 3.7.3 working with Docker Swarm's service discovery. I raised a GitHub issue where I showed that My RabbitMQ instances start but are unable to discover each other. Here is what I've tried:

rabbitmq.conf


cluster_formation.peer_discovery_backend = rabbit_peer_discovery_dns
cluster_formation.dns.hostname = rabbitmq

docker-stack.yml

version: '3.3'

services:
  rabbitmq:
    image: rabbitmq:3.7.0
    deploy:
      endpoint_mode: dnsrr
      replicas: 3
    environment:
      - RABBITMQ_DEFAULT_USER=admin
      - RABBITMQ_DEFAULT_PASS=password
      - RABBITMQ_ERLANG_COOKIE=foobar
      - RABBITMQ_USE_LONGNAME=true
    #healthcheck:
    #  test: ["rabbitmqctl", "node_health_check"]
    #  interval: 60s
    #  timeout: 5s
    #  retries: 3
    networks:
      - myoverlay
    ports:
      - mode: host
        target: 25672
        published: 25672
      - mode: host
        target: 15672
        published: 15672
      - mode: host
        target: 5672
        published: 5672
      - mode: host
        target: 4369
        published: 4369

networks:
  myoverlay:

I can't seem to get my cluster to form. Has anyone managed to getRabbitMQ working on a Docker Swarm. Is Docker Swarm being considered for being one of the built in methods of auto-scaling?

Michael Klishin

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Mar 5, 2018, 1:00:35 PM3/5/18

to rabbitm...@googlegroups.com

It would be considered if someone decides to contribute it.

We cannot suggest much without any logs. I could find any Docker Swarm docs that explain whether

the "dnsrr" mode sets up reverse lookup records, which rabbit_peer_discovery_dns needs [1].

I suggest that you enable debug mode, reset (or recreate from scratch) and take a look at the logs.

Both A/AAAA and reverse lookup query results should be logged.

1. http://www.rabbitmq.com/cluster-formation.html#peer-discovery-dns
2. http://www.rabbitmq.com/cluster-formation.html#troubleshooting-cluster-formation

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