Init repo

main.tf

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+provider "google" {
+  credentials = file(var.credentials_file)
+  project     = var.project_id
+  region      = var.region
+  zone        = var.zone
+}
+
+module "compute_engine_template" {
+  source = "./modules/compute_engine_template"
+  project_id  = var.project_id
+  region      = var.region
+  image_name  = var.image_name
+  instance_type = var.instance_type
+  startup_script = file("${path.module}/scripts/startup.sh")
+}
+
+module "compute_engine_instance_group" {
+  source = "./modules/compute_engine_instance_group"
+  project_id  = var.project_id
+  region      = var.region
+  template_self_link = module.compute_engine_template.self_link
+}
+
+module "load_balancer" {
+  source = "./modules/load_balancer"
+  project_id  = var.project_id
+  region      = var.region
+  backend_instance_group_self_link = module.compute_engine_instance_group.self_link
+}

modules/compute_engine_template/outputs.tf

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+output "self_link" {
+  value = google_compute_instance_template.template.self_link
+}

modules/load_balancer/outputs.tf

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+output "ip_address" {
+  value = google_compute_global_address.lb_address.address
+}

modules/load_balancer/variables.tf

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+variable "project_id" {}
+variable "region" {}
+variable "backend_instance_group_self_link" {}

outputs.tf

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+output "instance_group_url" {
+  value = module.compute_engine_instance_group.self_link
+}
+
+output "load_balancer_ip" {
+  value = module.load_balancer.ip_address
+}

scripts/startup.sh

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+#!/bin/bash
+sudo apt-get update
+sudo apt-get install -y nginx

terraform.tfvars

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+credentials_file = "path/to/credentials.json"
+project_id       = "terraform-demo-382210"
+region           = "us-central1"
+zone             = "us-central1-a"
+image_name       = "debian-cloud/debian-11"
+instance_type    = "n1-standard-1"

variables.tf

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+variable "credentials_file" {}
+variable "project_id" {}
+variable "region" {}
+variable "zone" {}
+variable "image_name" {}
+variable "instance_type" {}