Esempi Terraform per un bilanciatore del carico di rete passthrough interno

Puoi utilizzare l'esempio seguente per eseguire il deployment di un bilanciatore del carico di rete passthrough interno di esempio.

Se non hai mai utilizzato Terraform per Google Cloud, consulta la guida introduttiva a Terraform.

Bilanciatore del carico di rete passthrough interno senza backend

Puoi utilizzare un modulo Terraform per visualizzare un bilanciatore del carico di rete passthrough interno minimo con una rete Virtual Private Cloud, una subnet e tutti i componenti di bilanciamento del carico necessari, ma senza backend. Questo può essere utile se hai già altri script o processi per la creazione dei tuoi backend.

Per informazioni su questo esempio e per scoprire come eseguirlo, consulta il file README in GitHub.

esempi/minimal/main.tf 
module "test_ilb" {
  source       = "GoogleCloudPlatform/lb-internal/google"
  version      = "~> 5.0"
  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
}

Bilanciatore del carico di rete passthrough interno con backend del gruppo di istanze gestite

Puoi utilizzare le risorse Terraform per visualizzare un bilanciatore del carico di rete passthrough interno con il backend di un gruppo di istanze gestite.

lb/internal_tcp_udp_lb_with_mig_backend/main.tf 

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-10"
    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-10"
    }
  }
}