diff --git a/modules/instance-group/main.tf b/modules/instance-group/main.tf
deleted file mode 100644
index 973baf0..0000000
--- a/modules/instance-group/main.tf
+++ /dev/null
@@ -1,117 +0,0 @@
-resource "google_compute_target_pool" "fancy_target_pool_fe" {
-  name = "fancy-target-pool"
-
-  instances = [
-    google_compute_instance.fancy_fe_instance1.self_link,
-    google_compute_instance.fancy_fe_instance2.self_link,
-  ]
-
-  health_checks = [
-    google_compute_http_health_check.fancy_fe_hc.self_link,
-  ]
-
-  session_affinity = "CLIENT_IP"
-}
-resource "google_compute_target_pool" "fancy_target_pool_be" {
-  name = "fancy-target-pool"
-
-  instances = [
-    google_compute_instance.fancy_be_instance1.self_link,
-    google_compute_instance.fancy_be_instance2.self_link,
-  ]
-
-  health_checks = [
-    google_compute_http_health_check.fancy_be_hc.self_link,
-  ]
-
-  session_affinity = "CLIENT_IP"
-}
-
-
-resource "google_compute_instance_group_manager" "fancy_fe_mig" {
-  name = "fancy-fe-mig"
-  base_instance_name = "fancy-fe"
-  instance_template = google_compute_instance_template.fancy_fe_template.self_link
-  target_size = 2
-  
-  target_pools = [
-    google_compute_target_pool.fancy_target_pool_fe.self_link
-  ]
-  
-  zone = "us-central1-f"
-  
-  update_policy {
-    type = "PROACTIVE"
-    min_instance_restart_time_sec = 300
-  }
-  
-  named_port {
-    name = "frontend"
-    port = "8080"
-  }
-  
-  depends_on = [
-    google_compute_http_health_check.fancy_fe_hc,
-    google_compute_backend_service.fancy_backend_service,
-    google_compute_target_pool.fancy_target_pool_fe,
-  ]
-}
-
-resource "google_compute_instance_group_manager" "fancy_be_mig" {
-  name = "fancy-be-mig"
-  base_instance_name = "fancy-be"
-  instance_template = google_compute_instance_template.fancy_be_template.self_link
-  target_size = 2
-  
-  target_pools = [
-    google_compute_target_pool.fancy_target_pool_be.self_link
-  ]
-  
-  zone = "us-central1-f"
-  
-  update_policy {
-    type = "PROACTIVE"
-    min_instance_restart_time_sec = 300
-  }
-  
-  named_port {
-    name = "orders"
-    port = "8081"
-  }
-  
-  named_port {
-    name = "products"
-    port = "8082"
-  }
-  
-  depends_on = [
-    google_compute_http_health_check.fancy_be_hc,
-    google_compute_backend_service.fancy_backend_service,
-    google_compute_target_pool.fancy_target_pool_be,
-  ]
-}
-
-
-
-resource "google_compute_region_autoscaler" "fancy_fe_autoscaler" {
-  name = "fancy-fe-autoscaler"
-  target = google_compute_instance_group_manager.fancy_fe_mig.self_link
-  cooldown_period_sec = 60
-  load_balancing_utilization_target = 0.6
-  max_replicas = 2
-
-  depends_on = [
-    module.google_compute_instance_group_manager.fancy_fe_mig
-  ]
-}
-
-resource "google_compute_region_autoscaler" "fancy_be_autoscaler" {
-  name = "fancy-be-autoscaler"
-  target = google_compute_instance_group_manager.fancy_be_mig.self_link
-  cooldown_period_sec = 60
-  load_balancing_utilization_target = 0.6
-  max_replicas = 2
-  depends_on = [
-    google_compute_instance_group_manager.fancy_be_mig
-  ]
-}
diff --git a/modules/instances/main.tf b/modules/instances/main.tf
index 353b423..9f8d742 100644
--- a/modules/instances/main.tf
+++ b/modules/instances/main.tf
@@ -14,7 +14,11 @@ resource "google_compute_instance" "backend" {
       image = "debian-cloud/debian-10"
     }
   }
-
+  service_account {
+    // Use the default service account
+    email = "default"
+    scopes = ["cloud-platform"]
+  }
   network_interface {
     network = "default"
        access_config {
@@ -39,7 +43,11 @@ resource "google_compute_instance" "frontend" {
       image = "debian-cloud/debian-10"
     }
   }
-
+  service_account {
+    // Use the default service account
+    email = "default"
+    scopes = ["cloud-platform"]
+  }
   network_interface {
     network = "default"
        access_config {
diff --git a/modules/modify-instance-template/main.tf b/modules/modify-instance-template/main.tf
deleted file mode 100644
index 771689d..0000000
--- a/modules/modify-instance-template/main.tf
+++ /dev/null
@@ -1,61 +0,0 @@
-# Change machine type of frontend instance
-resource "google_compute_instance" "frontend" {
-  name = "frontend"
-  zone = "us-central1-f"
-  machine_type = "custom-4-3840"
-}
-
-# Create a new instance template for the frontend instances
-resource "google_compute_instance_template" "fancy_fe_new" {
-  name = "fancy-fe-new"
-  source_instance = google_compute_instance.frontend.self_link
-  source_instance_zone = google_compute_instance.frontend.zone
-
-  disk {
-    source = google_compute_instance.frontend.boot_disk[0].source
-    auto_delete = true
-  }
-
-  network_interface {
-    network = "default"
-    access_config {
-      nat_ip = google_compute_address.fancy_lb_ip.address
-    }
-  }
-}
-
-# Update the instance group with the new instance template
-resource "google_compute_region_instance_group_manager_rolling_update" "fancy_fe_mig_update" {
-  name = "fancy-fe-mig-update"
-  region = "us-central1"
-
-  managed_instance_group = google_compute_instance_group_manager.fancy_fe_mig.self_link
-
-  version {
-    name = "fancy-fe-new"
-    instance_template = google_compute_instance_template.fancy_fe_new.self_link
-  }
-
-  # Optional flags
-  max_surge = 1
-  max_unavailable = 1
-}
-
-
-# ENABLE CDN
-resource "google_compute_backend_service" "fancy_fe_frontend" {
-  name = "fancy-fe-frontend"
-  port_name = "frontend"
-  protocol = "HTTP"
-  load_balancing_scheme = "INTERNAL_SELF_MANAGED"
-
-  backend {
-    group = google_compute_instance_group_manager.fancy_fe_mig.self_link
-  }
-
-  health_checks = [
-    google_compute_http_health_check.fancy_fe_frontend_hc.self_link
-  ]
-
-  enable_cdn = true
-}
\ No newline at end of file