Hooking service to a load balancer

infra/alpha.tf

@@ -121,6 +121,12 @@ resource "aws_ecs_service" "sample" {
   task_definition = aws_ecs_task_definition.sample.arn
   desired_count   = 1
   launch_type = "FARGATE"
+  load_balancer {
+    target_group_arn = aws_lb_target_group.alpha_cluster.arn
+    container_name = "${var.athens_prefix}-sample-container"
+    container_port = 8080
+  }
+
   network_configuration {
     assign_public_ip = true
     subnets          = [ local.subnet ]

infra/load-balancer.tf

@@ -0,0 +1,36 @@
+# Here is the application load balancer that we use for services hosted on ECS
+##############################################################################
+
+
+# The LB that we'll use to move traffic into our services
+#########################################################
+resource "aws_lb" "alpha" {
+    name = "alpha-lb"
+    internal = false
+    load_balancer_type = "application"
+    subnets = [ aws_subnet.delphi.id, aws_subnet.crete_subnet.id ]
+    security_groups = [ aws_security_group.ecs_web_ingress.id ]
+    # TODO: change this to true later
+    enable_deletion_protection = false
+}
+
+# ECS services manage themselves when it comes to registering to the
+# target group so we only need to provide the pool
+####################################################################
+resource "aws_lb_target_group" "alpha_cluster" {
+  name = "${var.athens_prefix}-alpha-cluster"
+  port = 80
+  protocol = "HTTP"
+  target_type = "ip"
+  vpc_id = aws_vpc.athens_vpc.id
+}
+
+resource "aws_lb_listener" "http" {
+    load_balancer_arn = aws_lb.alpha.arn
+    port = 80
+    protocol = "HTTP"
+    default_action {
+      type = "forward"
+      target_group_arn = aws_lb_target_group.alpha_cluster.arn
+    }
+}