provider/google: Google Cloud content-based load balancing example. (#14448)
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terraform.tfstate
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terraform.tfstate.backup
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terraform.tfvars
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# Content Based Load Balancing in Google Cloud
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This provides a template for running an HTTP load balancer that distributes traffic to different instances based on the
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path in the request URL. It is based on the tutorial at [https://cloud.google.com/compute/docs/load-balancing/http/content-based-example](https://cloud.google.com/compute/docs/load-balancing/http/content-based-example).
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To start, [download your credentials from Google Cloud Console](https://www.terraform.io/docs/providers/google/#credentials); suggested path for downloaded file is `~/.gcloud/Terraform.json`.
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Optionally update `variables.tf` to specify a default value for the `project_name` variable, and check other variables.
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After you run `terraform apply` on this configuration, it will
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automatically output the public IP address of the load balancer.
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After your instance registers, the LB should respond with the following at its root:
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```html
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<h1>www</h1>
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```
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And the following at the /video/ url:
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```html
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<h1>www-video</h1>
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```
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To run, configure your Google Cloud provider as described in
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https://www.terraform.io/docs/providers/google/index.html
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Run with a command like this:
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```
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terraform apply \
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-var="region=us-central1" \
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-var="region_zone=us-central1-f" \
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-var="project_name=my-project-id-123" \
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-var="credentials_file_path=~/.gcloud/Terraform.json" \
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```
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# https://cloud.google.com/compute/docs/load-balancing/http/content-based-example
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provider "google" {
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region = "${var.region}"
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project = "${var.project_name}"
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credentials = "${file("${var.credentials_file_path}")}"
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}
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resource "google_compute_instance" "www" {
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name = "tf-www-compute"
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machine_type = "f1-micro"
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zone = "${var.region_zone}"
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tags = ["http-tag"]
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disk {
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image = "projects/debian-cloud/global/images/family/debian-8"
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}
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network_interface {
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network = "default"
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access_config {
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// Ephemeral IP
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}
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}
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metadata_startup_script = "${file("scripts/install-www.sh")}"
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service_account {
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scopes = ["https://www.googleapis.com/auth/compute.readonly"]
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}
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}
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resource "google_compute_instance" "www-video" {
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name = "tf-www-video-compute"
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machine_type = "f1-micro"
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zone = "${var.region_zone}"
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tags = ["http-tag"]
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disk {
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image = "projects/debian-cloud/global/images/family/debian-8"
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}
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network_interface {
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network = "default"
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access_config {
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// Ephemeral IP
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}
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}
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metadata_startup_script = "${file("scripts/install-video.sh")}"
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service_account {
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scopes = ["https://www.googleapis.com/auth/compute.readonly"]
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}
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}
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resource "google_compute_global_address" "external-address" {
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name = "tf-external-address"
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}
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resource "google_compute_instance_group" "www-resources" {
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name = "tf-www-resources"
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zone = "${var.region_zone}"
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instances = ["${google_compute_instance.www.self_link}"]
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named_port {
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name = "http"
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port = "80"
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}
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}
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resource "google_compute_instance_group" "video-resources" {
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name = "tf-video-resources"
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zone = "${var.region_zone}"
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instances = ["${google_compute_instance.www-video.self_link}"]
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named_port {
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name = "http"
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port = "80"
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}
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}
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resource "google_compute_health_check" "health-check" {
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name = "tf-health-check"
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http_health_check {
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}
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}
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resource "google_compute_backend_service" "www-service" {
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name = "tf-www-service"
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protocol = "HTTP"
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backend {
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group = "${google_compute_instance_group.www-resources.self_link}"
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}
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health_checks = ["${google_compute_health_check.health-check.self_link}"]
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}
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resource "google_compute_backend_service" "video-service" {
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name = "tf-video-service"
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protocol = "HTTP"
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backend {
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group = "${google_compute_instance_group.video-resources.self_link}"
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}
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health_checks = ["${google_compute_health_check.health-check.self_link}"]
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}
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resource "google_compute_url_map" "web-map" {
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name = "tf-web-map"
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default_service = "${google_compute_backend_service.www-service.self_link}"
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host_rule {
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hosts = ["*"]
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path_matcher = "tf-allpaths"
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}
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path_matcher {
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name = "tf-allpaths"
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default_service = "${google_compute_backend_service.www-service.self_link}"
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path_rule {
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paths = ["/video", "/video/*",]
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service = "${google_compute_backend_service.video-service.self_link}"
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}
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}
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}
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resource "google_compute_target_http_proxy" "http-lb-proxy" {
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name = "tf-http-lb-proxy"
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url_map = "${google_compute_url_map.web-map.self_link}"
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}
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resource "google_compute_global_forwarding_rule" "default" {
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name = "tf-http-content-gfr"
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target = "${google_compute_target_http_proxy.http-lb-proxy.self_link}"
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ip_address = "${google_compute_global_address.external-address.address}"
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port_range = "80"
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}
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resource "google_compute_firewall" "default" {
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name = "tf-www-firewall-allow-internal-only"
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network = "default"
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allow {
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protocol = "tcp"
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ports = ["80"]
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}
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source_ranges = ["130.211.0.0/22", "35.191.0.0/16"]
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target_tags = ["http-tag"]
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}
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output "application_public_ip" {
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value = "${google_compute_global_forwarding_rule.default.ip_address}"
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}
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#!/bin/bash -xe
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sudo apt-get update
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sudo apt-get install apache2 -y
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sudo a2ensite default-ssl
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sudo a2enmod ssl
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sudo service apache2 restart
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echo '<!doctype html><html><body><h1>www-video</h1></body></html>' | sudo tee /var/www/html/index.html
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sudo mkdir /var/www/html/video
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echo '<!doctype html><html><body><h1>www-video</h1></body></html>' | sudo tee /var/www/html/video/index.html
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#!/bin/bash -xe
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sudo apt-get update
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sudo apt-get install apache2 -y
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sudo a2ensite default-ssl
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sudo a2enmod ssl
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sudo service apache2 restart
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echo '<!doctype html><html><body><h1>www</h1></body></html>' | sudo tee /var/www/html/index.html
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region = "us-central1"
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region_zone = "us-central1-b"
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project_name = "my-project-id-123"
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credentials_file_path = "~/.gcloud/Terraform.json"
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variable "region" {
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default = "us-central1"
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}
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variable "region_zone" {
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default = "us-central1-f"
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}
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variable "project_name" {
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description = "The ID of the Google Cloud project"
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}
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variable "credentials_file_path" {
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description = "Path to the JSON file used to describe your account credentials"
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default = "~/.gcloud/Terraform.json"
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}
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