service.hcl

/**
 * Required Variables.
 */

variable "name" {}
variable "port" {}
variable "elb_security_group" {}
variable "elb_subnets" {}
variable "zone_id" {}
variable "environment" {}
variable "iam_role" {}
variable "cluster" {}
variable "task" {}


/**
 * Optional Variables.
 */

variable "healthcheck" { default = "/internal/health" }
variable "desired_count" { default = 2 }

/**
 * Resources.
 */

# The main ELB.

resource "aws_elb" "main" {
  name = "${var.name}"

  internal = true
  cross_zone_load_balancing = true
  subnets = ["${split(",", var.elb_subnets)}"]
  security_groups = ["${var.elb_security_group}"]

  idle_timeout = 30
  connection_draining = true
  connection_draining_timeout = 15

  listener {
    lb_port = 80
    lb_protocol = "http"
    instance_port = "${var.port}"
    instance_protocol = "http"
  }

  health_check {
    healthy_threshold = 2
    unhealthy_threshold = 2
    timeout = 5
    target = "HTTP:${var.port}${var.healthcheck}"
    interval = 30
  }

  tags {
    Name = "${var.name}-balancer"
    Service = "${var.name}"
  }
}

# <name>.segment.local. CNAME for the load balancer.

resource "aws_route53_record" "main" {
  zone_id = "${var.zone_id}"
  name = "${var.name}.segment.local"
  type = "CNAME"
  ttl = 60
  records = ["${aws_elb.main.dns_name}"]
}

# Creates a version of the service for the cluster.

resource "aws_ecs_service" "main" {
  name = "${var.name}"
  cluster = "${var.cluster}"
  task_definition = "${var.task}"
  desired_count = "${var.desired_count}"
  iam_role = "${var.iam_role}"

  load_balancer {
    elb_name = "${aws_elb.main.dns_name}"
    container_name = "${var.name}"
    container_port = "${var.container_port}"
  }
}

/**
 * Outputs.
 */

output "name" { value = "${var.name}" }
output "address" { value = "${var.name}.segment.local" }
output "elb" { value = "${aws_elb.main.id}" }
output "fqdn" { value = "${aws_route53_record.main.fqdn}" }