infra/terraform/modules/a3/common/network/main.tf

/*
 Copyright 2024 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

      https://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 {
  nic0 = {
    network = {
      id = one(concat(
        data.google_compute_network.nic0[*].id,
        resource.google_compute_network.nic0[*].id,
      ))
      name = one(concat(
        data.google_compute_network.nic0[*].name,
        resource.google_compute_network.nic0[*].name,
      ))
      self_link = one(concat(
        data.google_compute_network.nic0[*].self_link,
        resource.google_compute_network.nic0[*].self_link,
      ))
    }
    subnetwork = {
      name = one(concat(
        data.google_compute_subnetwork.nic0[*].name,
        resource.google_compute_subnetwork.nic0[*].name,
      ))
      self_link = one(concat(
        data.google_compute_subnetwork.nic0[*].self_link,
        resource.google_compute_subnetwork.nic0[*].self_link,
      ))
    }
  }
}

// CPU NIC

data "google_compute_network" "nic0" {
  count = var.nic0_existing != null ? 1 : 0

  name    = var.nic0_existing.network_name
  project = var.project_id
}

data "google_compute_subnetwork" "nic0" {
  count = var.nic0_existing != null ? 1 : 0

  name    = var.nic0_existing.subnetwork_name
  project = var.project_id
  region  = var.region
}

resource "google_compute_network" "nic0" {
  count = var.nic0_existing != null ? 0 : 1

  auto_create_subnetworks = false
  mtu                     = 8896
  name                    = var.resource_prefix
  project                 = var.project_id
}

resource "google_compute_subnetwork" "nic0" {
  count = var.nic0_existing != null ? 0 : 1

  ip_cidr_range = "10.0.0.0/19"
  name          = var.resource_prefix
  network       = google_compute_network.nic0[0].self_link
  project       = var.project_id
  region        = var.region
}

resource "google_compute_firewall" "internal-ingress" {
  count = var.nic0_existing != null ? 0 : 1

  description   = "internal ingress traffic (icmp/tcp/udp) to machine on nic0"
  direction     = "INGRESS"
  name          = "${var.resource_prefix}-internal-ingress"
  network       = google_compute_network.nic0[0].self_link
  project       = var.project_id
  source_ranges = ["10.0.0.0/8"]

  allow {
    protocol = "icmp"
  }
  allow {
    protocol = "tcp"
    ports    = ["0-65535"]
  }
  allow {
    protocol = "udp"
    ports    = ["0-65535"]
  }
}

resource "google_compute_firewall" "external-ingress" {
  count = var.nic0_existing != null ? 0 : 1

  description   = "external ingress traffic (icmp) to machine on nic0"
  direction     = "INGRESS"
  name          = "${var.resource_prefix}-external-ingress"
  network       = google_compute_network.nic0[0].self_link
  project       = var.project_id
  source_ranges = ["0.0.0.0/0"]

  allow {
    protocol = "icmp"
  }
}

resource "google_compute_firewall" "iap-ssh" {
  count = var.nic0_existing != null ? 0 : 1

  description   = "identity-aware proxy ssh traffic to machine on nic0"
  direction     = "INGRESS"
  name          = "${var.resource_prefix}-iap-ssh"
  network       = google_compute_network.nic0[0].self_link
  project       = var.project_id
  source_ranges = ["35.235.240.0/20"]

  allow {
    protocol = "tcp"
    ports    = ["22"]
  }
}

// GPU NICs

resource "google_compute_network" "gpus" {
  count = 4

  auto_create_subnetworks = false
  mtu                     = 8244
  name                    = "${var.resource_prefix}-gpu-${count.index}"
  project                 = var.project_id
}

resource "google_compute_subnetwork" "gpus" {
  count = 4

  ip_cidr_range = "10.${count.index + 1}.0.0/19"
  name          = "${var.resource_prefix}-gpu-${count.index}"
  network       = google_compute_network.gpus[count.index].self_link
  project       = var.project_id
  region        = var.region
}

resource "google_compute_firewall" "internal-ingress-gpus" {
  count = 4

  description   = "allow internal ingress traffic to gpus on nic${count.index + 1}"
  direction     = "INGRESS"
  name          = "${var.resource_prefix}-internal-ingress-gpu-${count.index}"
  network       = resource.google_compute_network.gpus[count.index].self_link
  project       = var.project_id
  source_ranges = ["10.0.0.0/8"]

  allow {
    protocol = "icmp"
  }
  allow {
    protocol = "tcp"
    ports    = ["0-65535"]
  }
  allow {
    protocol = "udp"
    ports    = ["0-65535"]
  }
}