managed-instance-group/mig.tf

data "template_file" "startup_script" {
  template = "${format("%s%s", file("${path.module}/scripts/common.sh.tpl"), file("${path.module}/scripts/${var.web_server}.sh.tpl"))}"

  vars = {
    WEB_SERVER  = var.web_server
    DOMAIN_NAME = var.domain_name

    DB_NAME     = var.db_name
    DB_USER     = var.db_user
    DB_PASSWORD = var.db_password
    DB_HOST     = var.db_host
  }
}

data "google_service_account" "vm" {
  account_id = var.service_account
}

module "instance_template" {
  source  = "terraform-google-modules/vm/google//modules/instance_template"
  version = "~> 7.4.0"

  name_prefix = var.hostname_prefix
  subnetwork  = data.google_compute_subnetwork.this.name
  service_account = {
    email  = data.google_service_account.vm.email
    scopes = ["cloud-platform"]
  }
  disk_type            = var.disk_type
  machine_type         = var.machine_type
  region               = data.google_client_config.current.region
  startup_script       = data.template_file.startup_script.rendered
  source_image         = var.image
  source_image_project = var.image_project
  tags = compact([
    var.hostname_prefix,
    var.nat_router_name,
  ])
}

module "mig" {
  source  = "terraform-google-modules/vm/google//modules/mig"
  version = "~> 7.4.0"

  project_id        = data.google_client_config.current.project
  region            = data.google_client_config.current.region
  target_size       = var.target_size
  hostname          = var.hostname_prefix
  instance_template = module.instance_template.self_link
  subnetwork        = data.google_compute_subnetwork.this.name
  named_ports = [{
    name = "http",
    port = var.port
  }]
}