ECS service module

app.tf

module "myapp" {
  source = "modules/myapp_service"
  environment = "${var.environment}"
  ecs_cluster_id = "${module.ecs_cluster.cluster_id}"
}

ecs_service.tf

variable "ecs_cluster_id" {}
variable "environment" {}
variable "count" { default = 1 }
variable "console_tag" { default = "latest" }
variable "hub_tag" { default = "latest" }
variable "registry" { default = "<our-id>.dkr.ecr.us-east-1.amazonaws.com" }

resource "template_file" "containers" {
  template = "${path.module}/containers/myaapp.json.tpl"
  vars = {
    registry = "${var.registry}"
    console_tag = "${var.console_tag}"
    hub_tag = "${var.hub_tag}"
  }
}

resource "aws_ecs_task_definition" "myapp" {
  family = "myapp-${var.environment}"
  container_definitions = "${template_file.containers.rendered}"
}

resource "aws_ecs_service" "myapp" {
  name = "myapp-${var.environment}"
  cluster = "${var.ecs_cluster_id}"
  task_definition = "${aws_ecs_task_definition.myapp.arn}"
  desired_count = "${var.count}"
}