Ejemplos de Terraform para un balanceador de carga de red de paso a través interno

Puedes usar el siguiente ejemplo para desplegar un balanceador de carga de red de paso a través interno de muestra.

Si no has usado Terraform para Google Cloud, consulta el artículo Introducción a Terraform.

Balanceador de carga de red de paso a través interno sin backends

Puedes usar un módulo de Terraform para crear un balanceador de carga de red interno de transferencia mínimo con una red de nube privada virtual, una subred y todos los componentes de balanceo de carga necesarios, pero sin back-ends. Esto puede ser útil si ya tienes otro script o proceso para crear tus back-ends.

Para obtener información sobre este ejemplo y saber cómo ejecutarlo, consulta el archivo README en GitHub.

module "test_ilb" {
  source  = "GoogleCloudPlatform/lb-internal/google"
  version = "~> 7.0"

  project      = var.project_id
  network      = google_compute_network.test.name
  subnetwork   = google_compute_subnetwork.test.name
  region       = var.region
  name         = local.resource_name
  ports        = ["8080"]
  source_tags  = ["source-tag-foo"]
  target_tags  = ["target-tag-bar"]
  backends     = []
  health_check = local.health_check
}

Balanceador de carga de red de paso a través interno con backend de grupo de instancias gestionado

Puede usar recursos de Terraform para crear un balanceador de carga de red interno de transferencia con un backend de grupo de instancias gestionado.

resource "google_compute_network" "ilb_network" {
  name                    = "l4-ilb-network"
  auto_create_subnetworks = false
}

resource "google_compute_subnetwork" "ilb_subnet" {
  name          = "l4-ilb-subnet"
  ip_cidr_range = "10.0.1.0/24"
  region        = "europe-west1"
  network       = google_compute_network.ilb_network.id
}

resource "google_compute_forwarding_rule" "google_compute_forwarding_rule" {
  name                  = "l4-ilb-forwarding-rule"
  backend_service       = google_compute_region_backend_service.default.id
  region                = "europe-west1"
  ip_protocol           = "TCP"
  load_balancing_scheme = "INTERNAL"
  all_ports             = true
  allow_global_access   = true
  network               = google_compute_network.ilb_network.id
  subnetwork            = google_compute_subnetwork.ilb_subnet.id
}

resource "google_compute_region_backend_service" "default" {
  name                  = "l4-ilb-backend-subnet"
  region                = "europe-west1"
  protocol              = "TCP"
  load_balancing_scheme = "INTERNAL"
  health_checks         = [google_compute_region_health_check.default.id]
  backend {
    group          = google_compute_region_instance_group_manager.mig.instance_group
    balancing_mode = "CONNECTION"
  }
}

resource "google_compute_instance_template" "instance_template" {
  name         = "l4-ilb-mig-template"
  machine_type = "e2-small"
  tags         = ["allow-ssh", "allow-health-check"]

  network_interface {
    network    = google_compute_network.ilb_network.id
    subnetwork = google_compute_subnetwork.ilb_subnet.id
    access_config {
      # add external ip to fetch packages
    }
  }
  disk {
    source_image = "debian-cloud/debian-12"
    auto_delete  = true
    boot         = true
  }

  # install nginx and serve a simple web page
  metadata = {
    startup-script = <<-EOF1
      #! /bin/bash
      set -euo pipefail

      export DEBIAN_FRONTEND=noninteractive
      apt-get update
      apt-get install -y nginx-light jq

      NAME=$(curl -H "Metadata-Flavor: Google" "http://metadata.google.internal/computeMetadata/v1/instance/hostname")
      IP=$(curl -H "Metadata-Flavor: Google" "http://metadata.google.internal/computeMetadata/v1/instance/network-interfaces/0/ip")
      METADATA=$(curl -f -H "Metadata-Flavor: Google" "http://metadata.google.internal/computeMetadata/v1/instance/attributes/?recursive=True" | jq 'del(.["startup-script"])')

      cat <<EOF > /var/www/html/index.html
      <pre>
      Name: $NAME
      IP: $IP
      Metadata: $METADATA
      </pre>
      EOF
    EOF1
  }
  lifecycle {
    create_before_destroy = true
  }
}

resource "google_compute_region_health_check" "default" {
  name   = "l4-ilb-hc"
  region = "europe-west1"
  http_health_check {
    port = "80"
  }
}

resource "google_compute_region_instance_group_manager" "mig" {
  name   = "l4-ilb-mig1"
  region = "europe-west1"
  version {
    instance_template = google_compute_instance_template.instance_template.id
    name              = "primary"
  }
  base_instance_name = "vm"
  target_size        = 2
}

# allow all access from health check ranges
resource "google_compute_firewall" "fw_hc" {
  name          = "l4-ilb-fw-allow-hc"
  direction     = "INGRESS"
  network       = google_compute_network.ilb_network.id
  source_ranges = ["130.211.0.0/22", "35.191.0.0/16", "35.235.240.0/20"]
  allow {
    protocol = "tcp"
  }
  target_tags = ["allow-health-check"]
}

# allow communication within the subnet
resource "google_compute_firewall" "fw_ilb_to_backends" {
  name          = "l4-ilb-fw-allow-ilb-to-backends"
  direction     = "INGRESS"
  network       = google_compute_network.ilb_network.id
  source_ranges = ["10.0.1.0/24"]
  allow {
    protocol = "tcp"
  }
  allow {
    protocol = "udp"
  }
  allow {
    protocol = "icmp"
  }
}

# allow SSH
resource "google_compute_firewall" "fw_ilb_ssh" {
  name      = "l4-ilb-fw-ssh"
  direction = "INGRESS"
  network   = google_compute_network.ilb_network.id
  allow {
    protocol = "tcp"
    ports    = ["22"]
  }
  target_tags   = ["allow-ssh"]
  source_ranges = ["0.0.0.0/0"]
}

resource "google_compute_instance" "vm_test" {
  name         = "l4-ilb-test-vm"
  tags         = ["allow-ssh"]
  zone         = "europe-west1-b"
  machine_type = "e2-small"
  network_interface {
    network    = google_compute_network.ilb_network.id
    subnetwork = google_compute_subnetwork.ilb_subnet.id
  }
  boot_disk {
    initialize_params {
      image = "debian-cloud/debian-12"
    }
  }
}