full working example!

2-simple-example/iac/.terraform.lock.hcl

@@ -19,3 +19,20 @@ provider "registry.opentofu.org/hashicorp/aws" {
     "zh:e7b54a0faecd34a9c73729d1d1f0cfc1b8f56bae789f95987002616f1265ce72",
   ]
 }
+
+provider "registry.opentofu.org/hashicorp/null" {
+  version = "3.2.2"
+  hashes = [
+    "h1:xN1tSeF/rUBfaddk/AVqk4i65z/MMM9uVZWd2cWCCH0=",
+    "zh:00e5877d19fb1c1d8c4b3536334a46a5c86f57146fd115c7b7b4b5d2bf2de86d",
+    "zh:1755c2999e73e4d73f9de670c145c9a0dc5a373802799dff06a0e9c161354163",
+    "zh:2b29d706353bc9c4edda6a2946af3322abe94372ffb421d81fa176f1e57e33be",
+    "zh:34f65259c6d2bd51582b6da536e782b181b23725782b181193b965f519fbbacd",
+    "zh:370f6eb744475926a1fa7464d82d46ad83c2e1148b4b21681b4cec4d75b97969",
+    "zh:5950bdb23b4fcc6431562d7eba3dea37844aa4220c4da2eb898ae3e4d1b64ec4",
+    "zh:8f3d5c8d4b9d497fec36953a227f80c76d37fc8431b683a23fb1c42b9cccbf8a",
+    "zh:8f6eb5e65c047bf490ad3891efecefc488503b65898d4ee106f474697ba257d7",
+    "zh:a7040eed688316fe00379574c72bb8c47dbe2638b038bb705647cbf224de8f72",
+    "zh:e561f28df04d9e51b75f33004b7767a53c45ad96e3375d86181ba1363bffbc77",
+  ]
+}

2-simple-example/iac/ecs.tf

@@ -34,7 +34,7 @@ module "ecs_service" {
 
   name        = local.name
   cluster_arn = module.ecs_cluster.arn
-
+  desired_count = 3
   cpu    = 1024
   memory = 4096
 
@@ -44,20 +44,6 @@ module "ecs_service" {
   # Container definition(s)
   container_definitions = {
 
-    valkey = {
-      cpu       = 512
-      memory    = 1024
-      image     = "valkey/valkey:7.2.4-rc1-alpine"
-      port_mappings = [
-	{
-	  name		= "valkey"
-	  containerPort = 6379
-	  hostPort	= 6379
-	  protocol	= "tcp"
-	}
-      ]
-    }
-
     (local.container_name) = {
       cpu       = 512
       memory    = 1024
@@ -74,7 +60,7 @@ module "ecs_service" {
       environment = [
 	{
 	  name		= "REDIS_ENDPOINT"
-	  value		= "127.0.0.1"
+	  value		= "valkey"
 	},
       ]
 
@@ -82,6 +68,18 @@ module "ecs_service" {
     }
   }
 
+  service_connect_configuration = {
+    namespace = aws_service_discovery_http_namespace.this.arn
+    service = {
+      client_alias = {
+        port     = local.container_port
+        dns_name = local.container_name
+      }
+      port_name      = local.container_name
+      discovery_name = local.container_name
+    }
+  }
+
   load_balancer = {
     service = {
       target_group_arn = module.alb.target_groups["ex_ecs"].arn
@@ -116,6 +114,112 @@ module "ecs_service" {
   tags = local.tags
 }
 
+resource "aws_ecs_task_definition" "task" {
+  family                        = "service"
+  network_mode                  = "awsvpc"
+  requires_compatibilities      = ["FARGATE", "EC2"]
+  cpu                           = 512
+  memory                        = 1024
+  container_definitions         = jsonencode([
+    {
+      name      = "valkey"
+      image     = "valkey/valkey:7.2.4-rc1-alpine"
+      cpu       = 512
+      memory    = 1024
+      essential = true  # if true and if fails, all other containers fail. Must have at least one essential
+      portMappings = [
+        {
+	  name		= "valkey"
+          containerPort = 6379
+          hostPort      = 6379
+        }
+      ]
+    }
+  ])
+}
+
+resource "aws_ecs_service" "service" {
+  name              = "valkey"
+  cluster           = module.ecs_cluster.id
+  task_definition   = aws_ecs_task_definition.task.id
+  desired_count     = 1
+  launch_type       = "FARGATE"
+  platform_version  = "LATEST"
+
+  network_configuration {
+    assign_public_ip  = false
+    security_groups   = [aws_security_group.sg.id]
+    subnets           = module.vpc.private_subnets
+  }
+  lifecycle {
+    ignore_changes = [task_definition]
+  }
+
+  service_connect_configuration {
+    enabled   = true
+    namespace = "chat-app-demo" 
+    service {
+      discovery_name = "valkey"
+      port_name      = "valkey"
+      client_alias {
+        dns_name = "valkey"
+        port     = 6379
+      }
+    }
+  }
+
+}
+
+
+resource "aws_security_group" "sg" {
+  name        = "ecs"
+  vpc_id      = module.vpc.vpc_id
+
+  egress {
+    from_port   = 0
+    to_port     = 0
+    protocol    = "-1"
+    cidr_blocks = ["0.0.0.0/0"]
+  }
+
+  ingress {
+    protocol  = -1
+    self      = true
+    from_port = 0
+    to_port   = 0
+    description = ""
+  }
+
+  ingress {
+    from_port   = 6379
+    to_port     = 6379
+    protocol    = "tcp"
+    self        = "false"
+    cidr_blocks = ["0.0.0.0/0"]
+    description = "Port 80"
+  }
+
+}
+
+resource "null_resource" "update_desired_count" {
+  triggers = {
+    # Changes to this value will trigger the API call execution below
+    desired_count = 3
+  }
+
+  provisioner "local-exec" {
+    interpreter = ["/bin/bash", "-c"]
+
+    # Note: this requires the awscli to be installed locally where Terraform is executed
+    command = <<-EOT
+      aws ecs update-service \
+        --cluster ${module.ecs_cluster.name} \
+        --service ${module.ecs_service.name} \
+        --desired-count ${null_resource.update_desired_count.triggers.desired_count}
+    EOT
+  }
+}
+
 ################################################################################
 # Supporting Resources
 ################################################################################

2-simple-example/iac/route53.tf

@@ -0,0 +1,11 @@
+resource "aws_route53_record" "chat" {
+  zone_id = "Z2TWGHEC8YQMWW"
+  name    = "chat.ngd.io"
+  type    = "A"
+
+  alias {
+    name                   = module.alb.dns_name
+    zone_id                = module.alb.zone_id
+    evaluate_target_health = true
+  }
+}