terraform/modules/nw/main.tf

/**
 * Copyright 2021 Google LLC
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

locals {
  device_name_1      = "${var.instance_name}-${var.device_1}"
  device_name_2      = "${var.instance_name}-${var.device_2}"
  device_name_3      = "${var.instance_name}-${var.device_3}"
  subnetwork_project = var.subnetwork_project == "" ? var.project_id : var.subnetwork_project
}

resource "google_compute_disk" "gcp_nw_pd_0" {
  project = var.project_id
  name    = "${var.instance_name}-nw-0"
  type    = var.additional_disk_type
  zone    = var.zone
  #  count   = var.usrsap_disk_size > 0 ? 1 : 0
  size = var.usrsap_disk_size
}

resource "google_compute_disk" "gcp_nw_pd_1" {
  project = var.project_id
  name    = "${var.instance_name}-nw-1"
  type    = var.additional_disk_type
  zone    = var.zone
  #  count   = var.sapmnt_disk_size > 0 ? 1 : 0
  size = var.sapmnt_disk_size
}

resource "google_compute_disk" "gcp_nw_pd_2" {
  project = var.project_id
  name    = "${var.instance_name}-nw-2"
  type    = var.additional_disk_type
  zone    = var.zone
  #  count   = var.swap_disk_size > 0 ? 1 : 0
  size = var.swap_disk_size
}

resource "google_compute_attached_disk" "gcp_nw_attached_pd_0" {
  project     = var.project_id
  count       = var.usrsap_disk_size > 0 ? 1 : 0
  device_name = local.device_name_1
  disk        = element(google_compute_disk.gcp_nw_pd_0.*.self_link, count.index)
  instance    = google_compute_instance.gcp_nw.self_link
}

resource "google_compute_attached_disk" "gcp_nw_attached_pd_1" {
  project     = var.project_id
  count       = var.sapmnt_disk_size > 0 ? 1 : 0
  device_name = local.device_name_2
  disk        = element(google_compute_disk.gcp_nw_pd_1.*.self_link, count.index)
  instance    = google_compute_instance.gcp_nw.self_link
}

resource "google_compute_attached_disk" "gcp_nw_attached_pd_2" {
  project     = var.project_id
  count       = var.swap_disk_size > 0 ? 1 : 0
  device_name = local.device_name_3
  disk        = element(google_compute_disk.gcp_nw_pd_2.*.self_link, count.index)
  instance    = google_compute_instance.gcp_nw.self_link
}

data "google_compute_image" "image" {
  family  = var.source_image_family
  project = var.source_image_project
}

resource "google_compute_instance" "gcp_nw" {
  project                   = var.project_id
  name                      = var.instance_name
  machine_type              = var.instance_type
  zone                      = var.zone
  tags                      = var.network_tags
  allow_stopping_for_update = true
  can_ip_forward            = true

  scheduling {
    automatic_restart   = true
    on_host_maintenance = "MIGRATE"
  }

  boot_disk {
    auto_delete = var.autodelete_disk
    device_name = "${var.instance_name}-${var.device_0}"

    initialize_params {
      image = data.google_compute_image.image.self_link
      size  = var.boot_disk_size
      type  = var.boot_disk_type
    }
  }

  network_interface {
    subnetwork         = var.subnetwork
    subnetwork_project = local.subnetwork_project
    dynamic "access_config" {
      for_each = [for i in [""] : i if var.use_public_ip]
      content {}
    }

  }

  metadata = {
    ssh-keys = "${var.ssh_user}:${file("${var.public_key_path}")}"
  }

  lifecycle {
    # Ignore changes in the instance metadata, since it is modified by the SAP startup script.
    # https://github.com/terraform-providers/terraform-provider-google/issues/2098
    ignore_changes = [metadata, attached_disk]
  }

  service_account {
    email  = var.service_account_email
    scopes = ["cloud-platform"]
  }
}

data "google_compute_instance" "sap_instance" {
  name    = google_compute_instance.gcp_nw.name
  project = var.project_id
  zone    = var.zone
}