node.tf

data "template_file" "node_user_data" {
  template = "${file("${path.module}/node_user_data.sh")}"

  vars {
    root         = "${var.root}"
    datadog_key  = "${var.datadog_key}"
    node_version = "${var.node_version}"
    src_location = "${var.src_location}"
  }
}

resource "aws_launch_template" "node_lt" {
  image_id               = "${var.ami_id}"
  instance_type          = "t2.micro"
  key_name               = "${var.key_pair_name}"
  vpc_security_group_ids = ["${aws_security_group.apps.id}"]
  user_data              = "${base64encode("${data.template_file.node_user_data.rendered}")}"
  name_prefix            = "node_lt-"

  lifecycle {
    create_before_destroy = true
  }
}

resource "aws_elb" "node_asg_elb" {
  name_prefix        = "node-"
  availability_zones = ["${var.availability_zone}"]
  security_groups    = ["${aws_security_group.elb.id}"]

  listener {
    instance_port     = 3000
    instance_protocol = "http"
    lb_port           = 80
    lb_protocol       = "http"
  }

  provisioner "local-exec" {
    command = "echo ${aws_elb.node_asg_elb.dns_name} > node/elb_dns"
  }
}

resource "aws_autoscaling_group" "node_asg" {
  name_prefix      = "node_asg-"
  max_size         = 3
  min_size         = 0
  desired_capacity = 1

  load_balancers     = ["${aws_elb.node_asg_elb.name}"]
  availability_zones = ["${var.availability_zone}"]

  launch_template = {
    id      = "${aws_launch_template.node_lt.id}"
    version = "$$Latest"
  }

  tag {
    key                 = "Name"
    value               = "tp_arqui_node_asg_instance"
    propagate_at_launch = true
  }
}