RabbitMQ cluster formation using single Docker Swarm service

Prerequisites

Cluster configuration summary

RabbitMQ cluster is configured using classic_config.

See details here

cluster_formation.classic_config.nodes.1 = rabbit@rabbitmq-1
cluster_formation.classic_config.nodes.2 = rabbit@rabbitmq-2
cluster_formation.classic_config.nodes.3 = rabbit@rabbitmq-3

in rabbitmq.conf.

• rabbitmq-* is container name thanks to service template "rabbitmq-{{.Task.Slot}}". See details about temlates here

• rabbit@rabbitmq-1 is the expected node name from the point of view of RabbitMQ cluster.

Demo

• Create docker config:

docker config create rabbitmq-config rabbitmq.conf

• Create swarm network:

docker network create --driver overlay prod-net

• Deploy rabbitmq cluster as docker swarm service:

docker stack deploy -c docker-compose.yml cluster

• Find virtual ip of each container

docker exec -i [container_ip] hostname -i

• Modify /etc/hosts of each container to contain entries of other 2 containers:

For example for cluster_rabbitmq.1... container run:

docker exec -it [rabbitmq1_container_ip] bash bash-5.0# echo "10.0.1.9 rabbitmq-2" >> /etc/hosts bash-5.0# echo "10.0.1.10 rabbitmq-3" >> /etc/hosts

• Verify cluster is configured by running in any container:

docker exec -it [rabbitmq1_container_ip] bash

bash-5.0# rabbitmqctl cluster_status

You should see 3 nodes in cluster:

...
Running Nodes

rabbit@rabbitmq-1
rabbit@rabbitmq-2
rabbit@rabbitmq-3
...

Read more at RabbitMQ cluster as a single Docker Swarm service