Ejemplos de Terraform para un balanceador de cargas de red de transferencia interno

Puedes usar el siguiente ejemplo para implementar un balanceador de cargas de red de transferencia interno de muestra.

Si es la primera vez que usas Terraform para Google Cloud, consulta Comienza a usar Terraform.

Balanceador de cargas de red de transferencia interno sin backends

Puedes usar un módulo de Terraform para abrir un balanceador de cargas de red de transferencia interno mínimo con una red de nube privada virtual, una subred y todos los componentes necesarios del balanceo de cargas, pero no los backends. Esto puede ser útil si ya tienes otra secuencia de comandos o proceso para crear tus backends.

Para obtener información sobre este ejemplo y aprender a 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 cargas de red de transferencia interno con backend de grupo de instancias administrado

Puedes usar los recursos de Terraform para abrir un balanceador de cargas de red de transferencia interno con un backend de grupo de instancias administrado.

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"
    }
  }
}