Dead simple Terraform configuration for creating RabbitMQ cluster on AWS.

Branch	Build status
master

What it does ?

1. Uses official RabbitMQ docker image.
2. Creates N nodes in M subnets
3. Creates Autoscaling Group and ELB to load balance nodes
4. Makes sure nodes can talk to each other and create cluster
5. Make sure new nodes always join the cluster
6. Configures / vhost queues in High Available (Mirrored) mode with automatic synchronization ("ha-mode":"all", "ha-sync-mode":"3")

How to use it ?

Copy and paste into your Terraform configuration:

module "rabbitmq" {
  source                            = "ulamlabs/rabbitmq/aws"
  version                           = "2.0.1"
  vpc_id                            = "${var.vpc_id}"
  ssh_key_name                      = "${var.ssh_key_name}"
  subnet_ids                        = "${var.subnet_ids}"
  elb_additional_security_group_ids = ["var.cluster_security_group_id"]
  min_size                          = "3"
  max_size                          = "3"
  desired_size                      = "3"
}

then run terraform init, terraform plan and terraform apply.

Are 3 node not enough ? Update sizes to 5 and run terraform apply again, it will update Autoscaling Group and add 2 nodes more. Dead simple.

Node becomes unresponsive ? Autoscaling group and ELB Health Checks will automatically replace it with new one, without data loss.

Note: The VPC must have enableDnsHostnames = true and enableDnsSupport = true for the private DNS names to be resolvable for the nodes to connect to each other.