Terraform configuration for create GCP instance

config.tf

provider "google" {
  credentials = "${file("credentials.json")}"
  project     = "project"
  region      = "us-central1"
}

resource "google_compute_instance" "gcp_instance" {
  count        = 1
  name         = "test-instance-${count.index}"
  machine_type = "f1-micro"
  zone         = "us-west1-a"

  tags = ["http-server", "https-server"]

  boot_disk {
    initialize_params {
      image = "debian-cloud/debian-9"
    }
  }

  network_interface {
    network = "default"
    access_config {}
  }

  metadata = {
    sshKeys = "username:${file("~/.ssh/id_rsa.pub")}"
  }

  metadata_startup_script = "sudo apt update && sudo apt upgrade -y"
}

output "ip" {
  value = "${google_compute_instance.gcp_instance.*.network_interface.0.access_config.0.nat_ip}"
}