chore(docs): Added Shared VPC forwarding rule example (#344)

* Added Shared VPC forwarding rule example

* Updated README

* Fixed tf fmt

* Made shared data region tags specific so that we don't have to include both the network and subnetwork when both are not needed

examples/basic_shared_vpc/README.md

@@ -1,16 +1,24 @@
-# Simple shared VPC Project
+# Shared VPC network
 
 This example:
 
-* Enables shared VPC on a host project
-* Attaches a service project
-* Reserves an internal IP address in a subnet of a Shared VPC network
-* Creates a VM instance
+* Enables Shared VPC on a host project
 
-The IP address configuration object is created in the service
-project. Its value can come from the range of available addresses in
-the chosen shared subnet, or you can specify an address.
+* Attaches a service project
 
+* In the host project's shared subnet, creates the following service project
+  resources:
+
+  * Reserved internal IP address. The IP address can come from the range of
+    available addresses in the shared subnet, or you can specify an address.
+  * VM instance that uses the reserved IP address and has an interface in
+    the shared subnetwork.
+  * VM instance that uses an ephemeral IP address and has an interface in
+    the shared subnetwork.
+  * VM instance template that creates an interface in
+    the shared subnetwork.
+  * Forwarding rule in the shared VPC network and subnetwork, along with
+    a backend service and a health check.
 
 <!-- BEGINNING OF PRE-COMMIT-TERRAFORM DOCS HOOK -->
 ## Inputs

examples/basic_shared_vpc/main.tf

@@ -27,13 +27,20 @@ resource "google_compute_shared_vpc_service_project" "service1" {
 }
 # [END vpc_shared_vpc_service_project_attach]
 
-# [START compute_shared_data]
+# [START compute_shared_data_network]
+data "google_compute_network" "network" {
+  name    = "my-network-123"
+  project = var.project
+}
+# [END compute_shared_data_network]
+
+# [START compute_shared_data_subnet]
 data "google_compute_subnetwork" "subnet" {
   name    = "my-subnet-123"
   project = var.project
   region  = "us-central1"
 }
-# [END compute_shared_data]
+# [END compute_shared_data_subnet]
 
 # [START compute_shared_internal_ip_create]
 resource "google_compute_address" "internal" {
@@ -96,3 +103,32 @@ resource "google_compute_instance_template" "default" {
   }
 }
 # [END compute_shared_instance_template_create]
+
+resource "google_compute_region_health_check" "default" {
+  name   = "l4-ilb-hc"
+  region = "europe-west1"
+  http_health_check {
+    port = "80"
+  }
+}
+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]
+}
+# [START compute_shared_forwarding_rule_l4_ilb]
+resource "google_compute_forwarding_rule" "default" {
+  project               = var.service_project
+  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               = data.google_compute_network.network.self_link
+  subnetwork            = data.google_compute_subnetwork.subnet.self_link
+}
+# [END compute_shared_forwarding_rule_l4_ilb]