alb snippets

main.tf

resource "aws_lb_target_group" "main" {
  name                 = "${lookup(var.target_groups[count.index], "name")}"
  vpc_id               = "${var.vpc_id}"
  port                 = "${lookup(var.target_groups[count.index], "backend_port")}"
  protocol             = "${upper(lookup(var.target_groups[count.index], "backend_protocol"))}"
  deregistration_delay = "${lookup(var.target_groups[count.index], "deregistration_delay", lookup(var.target_groups_defaults, "deregistration_delay"))}"
  target_type          = "${lookup(var.target_groups[count.index], "target_type", lookup(var.target_groups_defaults, "target_type"))}"

  health_check {
    interval            = "${lookup(var.target_groups[count.index], "health_check_interval", lookup(var.target_groups_defaults, "health_check_interval"))}"
    path                = "${lookup(var.target_groups[count.index], "health_check_path", lookup(var.target_groups_defaults, "health_check_path"))}"
    port                = "${lookup(var.target_groups[count.index], "health_check_port", lookup(var.target_groups_defaults, "health_check_port"))}"
    healthy_threshold   = "${lookup(var.target_groups[count.index], "health_check_healthy_threshold", lookup(var.target_groups_defaults, "health_check_healthy_threshold"))}"
    unhealthy_threshold = "${lookup(var.target_groups[count.index], "health_check_unhealthy_threshold", lookup(var.target_groups_defaults, "health_check_unhealthy_threshold"))}"
    timeout             = "${lookup(var.target_groups[count.index], "health_check_timeout", lookup(var.target_groups_defaults, "health_check_timeout"))}"
    protocol            = "${upper(lookup(var.target_groups[count.index], "healthcheck_protocol", lookup(var.target_groups[count.index], "backend_protocol")))}"
    matcher             = "${lookup(var.target_groups[count.index], "health_check_matcher", lookup(var.target_groups_defaults, "health_check_matcher"))}"
  }

  stickiness {
    type            = "lb_cookie"
    cookie_duration = "${lookup(var.target_groups[count.index], "cookie_duration", lookup(var.target_groups_defaults, "cookie_duration"))}"
    enabled         = "${lookup(var.target_groups[count.index], "stickiness_enabled", lookup(var.target_groups_defaults, "stickiness_enabled"))}"
  }

  tags  = "${merge(var.tags, map("Name", lookup(var.target_groups[count.index], "name")))}"
  count = "${var.target_groups_count}"

  depends_on = ["aws_lb.application"]
}

test_fixture_main.tf

locals {
  target_groups_count = 2

  target_groups = "${list(
                        map("name", "foo",
                            "backend_protocol", "HTTP",
                            "backend_port", 80,
                        ),
                        map("name", "bar",
                            "backend_protocol", "HTTP",
                            "backend_port", 8080,
                        ),
  )}
}

module "alb" {
  source                   = "terraform-aws-modules/alb/aws"
  version                  = "3.1.0"
  load_balancer_name       = "test-alb-${random_string.suffix.result}"
  security_groups          = ["${module.security_group.this_security_group_id}"]
  log_bucket_name          = "${aws_s3_bucket.log_bucket.id}"
  log_location_prefix      = "${var.log_location_prefix}"
  subnets                  = "${module.vpc.public_subnets}"
  tags                     = "${local.tags}"
  vpc_id                   = "${module.vpc.vpc_id}"
  https_listeners          = "${local.https_listeners}"
  https_listeners_count    = "${local.https_listeners_count}"
  http_tcp_listeners       = "${local.http_tcp_listeners}"
  http_tcp_listeners_count = "${local.http_tcp_listeners_count}"
  target_groups            = "${local.target_groups}"
  target_groups_count      = "${local.target_groups_count}"
  extra_ssl_certs          = "${local.extra_ssl_certs}"
  extra_ssl_certs_count    = "${local.extra_ssl_certs_count}"
}

variables.tf

variable "target_groups" {
  description = "A list of maps containing key/value pairs that define the target groups to be created. Order of these maps is important and the index of these are to be referenced in listener definitions. Required key/values: name, backend_protocol, backend_port. Optional key/values are in the target_groups_defaults variable."
  type        = "list"
  default     = []
}

variable "target_groups_count" {
  description = "A manually provided count/length of the target_groups list of maps since the list cannot be computed."
  default     = 0
}

variable "target_groups_defaults" {
  description = "Default values for target groups as defined by the list of maps."
  type        = "map"

  default = {
    "cookie_duration"                  = 86400
    "deregistration_delay"             = 300
    "health_check_interval"            = 10
    "health_check_healthy_threshold"   = 3
    "health_check_path"                = "/"
    "health_check_port"                = "traffic-port"
    "health_check_timeout"             = 5
    "health_check_unhealthy_threshold" = 3
    "health_check_matcher"             = "200-299"
    "stickiness_enabled"               = true
    "target_type"                      = "instance"
  }
}