Feat: register service to multiple target groups (#70)

examples/basic/extra-target-groups.tf

@@ -0,0 +1,25 @@
+// In case of extra target groups (extra_target_groups)
+
+resource "aws_lb_target_group" "extra" {
+  name        = "${var.name_prefix}-3000"
+  port        = 3000 // extra port the Fargate service expose
+  protocol    = "HTTP"
+  target_type = "ip"
+  vpc_id      = data.aws_vpc.main.id
+  tags = {
+    environment = "dev"
+    terraform   = "True"
+  }
+}
+
+
+resource "aws_lb_listener" "extra_listener" {
+  load_balancer_arn = module.fargate_alb.arn
+  port              = 9000 // The port alb listen to and, bind to the service port (3000)
+  protocol          = "HTTP"
+
+  default_action {
+    target_group_arn = aws_lb_target_group.extra.arn
+    type             = "forward"
+  }
+}

examples/basic/main.tf

@@ -101,6 +101,13 @@ module "fargate" {
     }
   ]
 
+  extra_target_groups = [
+    {
+      port = 3000,
+      arn  = aws_lb_target_group.extra.arn
+    }
+  ]
+
   task_container_environment = {
     TEST_VARIABLE = "TEST_VALUE"
   }

main.tf

@@ -229,6 +229,15 @@ resource "aws_ecs_service" "service" {
     }
   }
 
+  dynamic "load_balancer" {
+    for_each = length(var.extra_target_groups) == 0 ? [] : var.extra_target_groups
+    content {
+      container_name   = var.container_name != "" ? var.container_name : var.name_prefix
+      container_port   = load_balancer.value.port
+      target_group_arn = load_balancer.value.arn
+    }
+  }
+
   deployment_controller {
     # The deployment controller type to use. Valid values: CODE_DEPLOY, ECS.
     type = var.deployment_controller_type

variables.tf

@@ -277,3 +277,12 @@ variable "volumes" {
   type        = list(any)
   default     = []
 }
+
+variable "extra_target_groups" {
+  description = "List of extra target group configurations used to register a service to multiple target groups"
+  type = list(object({
+    port = number
+    arn  = string
+  }))
+  default = []
+}