Exemple Terraform pour un équilibreur de charge HTTP(S) interne

Vous pouvez utiliser l'exemple suivant pour déployer un exemple d'équilibreur de charge HTTP(S) interne.

Si vous débutez avec Terraform sur Google Cloud, consultez la page Premiers pas avec Google Cloud sur le site Web de HashiCorp.

Équilibreur de charge HTTP(S) interne avec un backend de MIG

Vous pouvez utiliser des ressources Terraform pour générer un équilibreur de charge HTTP interne avec un backend de groupe d'instances géré.

Pour en savoir plus sur la configuration de l'équilibreur de charge, consultez le guide de configuration principal.

# VPC network
resource "google_compute_network" "ilb_network" {
  name                    = "l7-ilb-network"
  provider                = google-beta
  auto_create_subnetworks = false
}

# proxy-only subnet
resource "google_compute_subnetwork" "proxy_subnet" {
  name          = "l7-ilb-proxy-subnet"
  provider      = google-beta
  ip_cidr_range = "10.0.0.0/24"
  region        = "europe-west1"
  purpose       = "INTERNAL_HTTPS_LOAD_BALANCER"
  role          = "ACTIVE"
  network       = google_compute_network.ilb_network.id
}

# backend subnet
resource "google_compute_subnetwork" "ilb_subnet" {
  name          = "l7-ilb-subnet"
  provider      = google-beta
  ip_cidr_range = "10.0.1.0/24"
  region        = "europe-west1"
  network       = google_compute_network.ilb_network.id
}

# forwarding rule
resource "google_compute_forwarding_rule" "google_compute_forwarding_rule" {
  name                  = "l7-ilb-forwarding-rule"
  provider              = google-beta
  region                = "europe-west1"
  depends_on            = [google_compute_subnetwork.proxy_subnet]
  ip_protocol           = "TCP"
  load_balancing_scheme = "INTERNAL_MANAGED"
  port_range            = "80"
  target                = google_compute_region_target_http_proxy.default.id
  network               = google_compute_network.ilb_network.id
  subnetwork            = google_compute_subnetwork.ilb_subnet.id
  network_tier          = "PREMIUM"
}

# HTTP target proxy
resource "google_compute_region_target_http_proxy" "default" {
  name     = "l7-ilb-target-http-proxy"
  provider = google-beta
  region   = "europe-west1"
  url_map  = google_compute_region_url_map.default.id
}

# URL map
resource "google_compute_region_url_map" "default" {
  name            = "l7-ilb-regional-url-map"
  provider        = google-beta
  region          = "europe-west1"
  default_service = google_compute_region_backend_service.default.id
}

# backend service
resource "google_compute_region_backend_service" "default" {
  name                  = "l7-ilb-backend-subnet"
  provider              = google-beta
  region                = "europe-west1"
  protocol              = "HTTP"
  load_balancing_scheme = "INTERNAL_MANAGED"
  timeout_sec           = 10
  health_checks         = [google_compute_region_health_check.default.id]
  backend {
    group           = google_compute_region_instance_group_manager.mig.instance_group
    balancing_mode  = "UTILIZATION"
    capacity_scaler = 1.0
  }
}

# instance template
resource "google_compute_instance_template" "instance_template" {
  name         = "l7-ilb-mig-template"
  provider     = google-beta
  machine_type = "e2-small"
  tags         = ["http-server"]

  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
  }
}

# health check
resource "google_compute_region_health_check" "default" {
  name     = "l7-ilb-hc"
  provider = google-beta
  region   = "europe-west1"
  http_health_check {
    port_specification = "USE_SERVING_PORT"
  }
}

# MIG
resource "google_compute_region_instance_group_manager" "mig" {
  name     = "l7-ilb-mig1"
  provider = google-beta
  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 IAP and health check ranges
resource "google_compute_firewall" "fw-iap" {
  name          = "l7-ilb-fw-allow-iap-hc"
  provider      = google-beta
  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"
  }
}

# allow http from proxy subnet to backends
resource "google_compute_firewall" "fw-ilb-to-backends" {
  name          = "l7-ilb-fw-allow-ilb-to-backends"
  provider      = google-beta
  direction     = "INGRESS"
  network       = google_compute_network.ilb_network.id
  source_ranges = ["10.0.0.0/24"]
  target_tags   = ["http-server"]
  allow {
    protocol = "tcp"
    ports    = ["80", "443", "8080"]
  }
}

# test instance
resource "google_compute_instance" "vm-test" {
  name         = "l7-ilb-test-vm"
  provider     = google-beta
  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"
    }
  }
}

Équilibreur de charge HTTP(S) interne avec un backend de MIG et une redirection HTTP vers HTTPS

Vous pouvez utiliser les ressources Terraform pour afficher un équilibreur de charge HTTPS interne avec un backend de MIG et une redirection HTTP vers HTTPS.

Pour en savoir plus sur la configuration de l'équilibreur de charge, consultez le guide de configuration principal.


# VPC network
resource "google_compute_network" "default" {
  name                    = "l7-ilb-network"
  auto_create_subnetworks = false
}

# Proxy-only subnet
resource "google_compute_subnetwork" "proxy_subnet" {
  name          = "l7-ilb-proxy-subnet"
  ip_cidr_range = "10.0.0.0/24"
  region        = "europe-west1"
  purpose       = "INTERNAL_HTTPS_LOAD_BALANCER"
  role          = "ACTIVE"
  network       = google_compute_network.default.id
}

# Backend subnet
resource "google_compute_subnetwork" "default" {
  name          = "l7-ilb-subnet"
  ip_cidr_range = "10.0.1.0/24"
  region        = "europe-west1"
  network       = google_compute_network.default.id
}

# Reserved internal address
resource "google_compute_address" "default" {
  name         = "l7-ilb-ip"
  provider     = google-beta
  subnetwork   = google_compute_subnetwork.default.id
  address_type = "INTERNAL"
  address      = "10.0.1.5"
  region       = "europe-west1"
  purpose      = "SHARED_LOADBALANCER_VIP"
}

# Regional forwarding rule
resource "google_compute_forwarding_rule" "default" {
  name                  = "l7-ilb-forwarding-rule"
  region                = "europe-west1"
  depends_on            = [google_compute_subnetwork.proxy_subnet]
  ip_protocol           = "TCP"
  ip_address            = google_compute_address.default.id
  load_balancing_scheme = "INTERNAL_MANAGED"
  port_range            = "443"
  target                = google_compute_region_target_https_proxy.default.id
  network               = google_compute_network.default.id
  subnetwork            = google_compute_subnetwork.default.id
  network_tier          = "PREMIUM"
}

# Self-signed regional SSL certificate for testing
resource "tls_private_key" "default" {
  algorithm = "RSA"
  rsa_bits  = 2048
}

resource "tls_self_signed_cert" "default" {
  key_algorithm   = tls_private_key.default.algorithm
  private_key_pem = tls_private_key.default.private_key_pem

  # Certificate expires after 12 hours.
  validity_period_hours = 12

  # Generate a new certificate if Terraform is run within three
  # hours of the certificate's expiration time.
  early_renewal_hours = 3

  # Reasonable set of uses for a server SSL certificate.
  allowed_uses = [
    "key_encipherment",
    "digital_signature",
    "server_auth",
  ]

  dns_names = ["example.com"]

  subject {
    common_name  = "example.com"
    organization = "ACME Examples, Inc"
  }
}

resource "google_compute_region_ssl_certificate" "default" {
  name_prefix = "my-certificate-"
  private_key = tls_private_key.default.private_key_pem
  certificate = tls_self_signed_cert.default.cert_pem
  region      = "europe-west1"
  lifecycle {
    create_before_destroy = true
  }
}

# Regional target HTTPS proxy
resource "google_compute_region_target_https_proxy" "default" {
  name             = "l7-ilb-target-https-proxy"
  region           = "europe-west1"
  url_map          = google_compute_region_url_map.https_lb.id
  ssl_certificates = [google_compute_region_ssl_certificate.default.self_link]
}

# Regional URL map
resource "google_compute_region_url_map" "https_lb" {
  name            = "l7-ilb-regional-url-map"
  region          = "europe-west1"
  default_service = google_compute_region_backend_service.default.id
}

# Regional backend service
resource "google_compute_region_backend_service" "default" {
  name                  = "l7-ilb-backend-service"
  region                = "europe-west1"
  protocol              = "HTTP"
  port_name             = "http-server"
  load_balancing_scheme = "INTERNAL_MANAGED"
  timeout_sec           = 10
  health_checks         = [google_compute_region_health_check.default.id]
  backend {
    group           = google_compute_region_instance_group_manager.default.instance_group
    balancing_mode  = "UTILIZATION"
    capacity_scaler = 1.0
  }
}

# Instance template
resource "google_compute_instance_template" "default" {
  name         = "l7-ilb-mig-template"
  machine_type = "e2-small"
  tags         = ["http-server"]
  network_interface {
    network    = google_compute_network.default.id
    subnetwork = google_compute_subnetwork.default.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
  }
}

# Regional health check
resource "google_compute_region_health_check" "default" {
  name   = "l7-ilb-hc"
  region = "europe-west1"
  http_health_check {
    port_specification = "USE_SERVING_PORT"
  }
}

# Regional MIG
resource "google_compute_region_instance_group_manager" "default" {
  name   = "l7-ilb-mig1"
  region = "europe-west1"
  version {
    instance_template = google_compute_instance_template.default.id
    name              = "primary"
  }
  named_port {
    name = "http-server"
    port = 80
  }
  base_instance_name = "vm"
  target_size        = 2
}

# Allow all access to health check ranges
resource "google_compute_firewall" "default" {
  name          = "l7-ilb-fw-allow-hc"
  direction     = "INGRESS"
  network       = google_compute_network.default.id
  source_ranges = ["130.211.0.0/22", "35.191.0.0/16", "35.235.240.0/20"]
  allow {
    protocol = "tcp"
  }
}

# Allow http from proxy subnet to backends
resource "google_compute_firewall" "backends" {
  name          = "l7-ilb-fw-allow-ilb-to-backends"
  direction     = "INGRESS"
  network       = google_compute_network.default.id
  source_ranges = ["10.0.0.0/24"]
  target_tags   = ["http-server"]
  allow {
    protocol = "tcp"
    ports    = ["80", "443", "8080"]
  }
}

# Test instance
resource "google_compute_instance" "default" {
  name         = "l7-ilb-test-vm"
  zone         = "europe-west1-b"
  machine_type = "e2-small"
  network_interface {
    network    = google_compute_network.default.id
    subnetwork = google_compute_subnetwork.default.id
  }
  boot_disk {
    initialize_params {
      image = "debian-cloud/debian-10"
    }
  }
}

### HTTP-to-HTTPS redirect ###

# Regional forwarding rule
resource "google_compute_forwarding_rule" "redirect" {
  name                  = "l7-ilb-redirect"
  region                = "europe-west1"
  ip_protocol           = "TCP"
  ip_address            = google_compute_address.default.id # Same as HTTPS load balancer
  load_balancing_scheme = "INTERNAL_MANAGED"
  port_range            = "80"
  target                = google_compute_region_target_http_proxy.default.id
  network               = google_compute_network.default.id
  subnetwork            = google_compute_subnetwork.default.id
  network_tier          = "PREMIUM"
}

# Regional HTTP proxy
resource "google_compute_region_target_http_proxy" "default" {
  name    = "l7-ilb-target-http-proxy"
  region  = "europe-west1"
  url_map = google_compute_region_url_map.redirect.id
}

# Regional URL map
resource "google_compute_region_url_map" "redirect" {
  name            = "l7-ilb-redirect-url-map"
  region          = "europe-west1"
  default_service = google_compute_region_backend_service.default.id
  host_rule {
    hosts        = ["*"]
    path_matcher = "allpaths"
  }

  path_matcher {
    name            = "allpaths"
    default_service = google_compute_region_backend_service.default.id
    path_rule {
      paths = ["/"]
      url_redirect {
        https_redirect         = true
        host_redirect          = "10.0.1.5:443"
        redirect_response_code = "PERMANENT_REDIRECT"
        strip_query            = true
      }
    }
  }
}