Terraform ASG and Launch Config

asg.tf

resource "aws_launch_configuration" "lc" {
  lifecycle { create_before_destroy = true }

  image_id = "${var.ami_version}"
  instance_type = "${var.instance_type}"

  iam_instance_profile = "${var.service_name}-${var.environment}"
  key_name = "${var.key_name}"
  security_groups = ["${aws_security_group.sg1.id}"]
  user_data = "user-data.sh"
  depends_on = ["aws_iam_instance_profile.service_instance_profile"]
}

resource "aws_autoscaling_group" "asg" {
  lifecycle { create_before_destroy = true }

  # We generate a name that includes the launch config name to force a recreate
  name = "asg-${var.service_name}-${var.environment}-${aws_launch_configuration.lc.name}"

  availability_zones = ["${split(",", var.availability_zones)}"]

  health_check_grace_period = "${var.health_check_grace_period}"
  health_check_type = "${var.health_check_type}"
  launch_configuration = "${aws_launch_configuration.lc.id}"

  vpc_zone_identifier = ["${element(split(",", data.terraform_remote_state.core.core_public_subnets), 0)},${element(split(",", data.terraform_remote_state.core.core_public_subnets), 1)},${element(split(",", data.terraform_remote_state.core.core_public_subnets), 2)}"]

  max_size = "${var.asg_max_instances}"
  min_size = "${var.asg_min_instances}"

  tag {
    key = "Name"
    value = "asg-${var.service_name}-${var.environment}-${aws_launch_configuration.lc.name}"
    propagate_at_launch = true
  }
}