main.tf

# ---------------------------------------------------------------------------------------------------------------------
# DEPLOY THE CONSUL SERVER NODES
# ---------------------------------------------------------------------------------------------------------------------
module "consul_servers" {
  source = "git::https://github.com/hashicorp/terraform-aws-consul.git//modules/consul-cluster?ref=v0.8.4"

  cluster_name  = var.cluster_tag_value
  cluster_size  = var.num_servers
  instance_type = var.instance_type

  # The EC2 Instances will use these tags to automatically discover each other and form a cluster
  cluster_tag_key   = var.cluster_tag_key
  cluster_tag_value = var.cluster_tag_value

  ami_id    = var.ami_id
  user_data = data.template_file.user_data_consul_server.rendered

  vpc_id     = var.vpc_id
  subnet_ids = var.subnet_ids

  allowed_ssh_cidr_blocks = var.allowed_ssh_cidr_blocks

  allowed_inbound_cidr_blocks          = []
  allowed_inbound_security_group_count = 0
  ssh_key_name                         = var.ssh_key_name

  # Inject own instance profile with AWS SSM support
  enable_iam_setup          = false
  iam_instance_profile_name = aws_iam_instance_profile.instance_profile.name
}

# ---------------------------------------------------------------------------------------------------------------------
# THE USER DATA SCRIPT THAT WILL RUN ON EACH CONSUL SERVER EC2 INSTANCE WHEN IT'S BOOTING
# This script will configure and start Consul
# ---------------------------------------------------------------------------------------------------------------------
data "template_file" "user_data_consul_server" {
  template = file("${path.module}/user-data-consul-server.sh")

  vars = {
    cluster_tag_key   = var.cluster_tag_key
    cluster_tag_value = var.cluster_tag_value
  }
}