Add cross-region replication support to AlloyDB (#9012) (#566)

[upstream:79d5d56903e5ad2b38e9f855164132e5c53da8f6]

Signed-off-by: Modular Magician <[email protected]>

alloydb_secondary_cluster_basic/backing_file.tf

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+# This file has some scaffolding to make sure that names are unique and that
+# a region and zone are selected when you try to create your Terraform resources.
+
+locals {
+  name_suffix = "${random_pet.suffix.id}"
+}
+
+resource "random_pet" "suffix" {
+  length = 2
+}
+
+provider "google" {
+  region = "us-central1"
+  zone   = "us-central1-c"
+}

alloydb_secondary_cluster_basic/main.tf

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+resource "google_alloydb_cluster" "primary" {
+  cluster_id = "alloydb-primary-cluster-${local.name_suffix}"
+  location   = "us-central1"
+  network    = google_compute_network.default.id
+}
+
+resource "google_alloydb_instance" "primary" {
+  cluster       = google_alloydb_cluster.primary.name
+  instance_id   = "alloydb-primary-instance-${local.name_suffix}"
+  instance_type = "PRIMARY"
+
+  machine_config {
+    cpu_count = 2
+  }
+
+  depends_on = [google_service_networking_connection.vpc_connection]
+}
+
+resource "google_alloydb_cluster" "secondary" {
+  cluster_id   = "alloydb-secondary-cluster-${local.name_suffix}"
+  location     = "us-east1"
+  network      = google_compute_network.default.id
+  cluster_type = "SECONDARY"
+
+  continuous_backup_config {
+    enabled = false
+  }
+
+  secondary_config {
+    primary_cluster_name = google_alloydb_cluster.primary.name
+  }
+
+  depends_on = [google_alloydb_instance.primary]
+}
+
+data "google_project" "project" {}
+
+resource "google_compute_network" "default" {
+  name = "alloydb-secondary-cluster-${local.name_suffix}"
+}
+
+resource "google_compute_global_address" "private_ip_alloc" {
+  name          =  "alloydb-secondary-cluster-${local.name_suffix}"
+  address_type  = "INTERNAL"
+  purpose       = "VPC_PEERING"
+  prefix_length = 16
+  network       = google_compute_network.default.id
+}
+
+resource "google_service_networking_connection" "vpc_connection" {
+  network                 = google_compute_network.default.id
+  service                 = "servicenetworking.googleapis.com"
+  reserved_peering_ranges = [google_compute_global_address.private_ip_alloc.name]
+}

alloydb_secondary_cluster_basic/motd

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+===
+
+These examples use real resources that will be billed to the
+Google Cloud Platform project you use - so make sure that you
+run "terraform destroy" before quitting!
+
+===

alloydb_secondary_cluster_basic/tutorial.md

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+# Alloydb Secondary Cluster Basic - Terraform
+
+## Setup
+
+<walkthrough-author name="[email protected]" analyticsId="UA-125550242-1" tutorialName="alloydb_secondary_cluster_basic" repositoryUrl="https://github.com/terraform-google-modules/docs-examples"></walkthrough-author>
+
+Welcome to Terraform in Google Cloud Shell! We need you to let us know what project you'd like to use with Terraform.
+
+<walkthrough-project-billing-setup></walkthrough-project-billing-setup>
+
+Terraform provisions real GCP resources, so anything you create in this session will be billed against this project.
+
+## Terraforming!
+
+Let's use {{project-id}} with Terraform! Click the Cloud Shell icon below to copy the command
+to your shell, and then run it from the shell by pressing Enter/Return. Terraform will pick up
+the project name from the environment variable.
+
+```bash
+export GOOGLE_CLOUD_PROJECT={{project-id}}
+```
+
+After that, let's get Terraform started. Run the following to pull in the providers.
+
+```bash
+terraform init
+```
+
+With the providers downloaded and a project set, you're ready to use Terraform. Go ahead!
+
+```bash
+terraform apply
+```
+
+Terraform will show you what it plans to do, and prompt you to accept. Type "yes" to accept the plan.
+
+```bash
+yes
+```
+
+
+## Post-Apply
+
+### Editing your config
+
+Now you've provisioned your resources in GCP! If you run a "plan", you should see no changes needed.
+
+```bash
+terraform plan
+```
+
+So let's make a change! Try editing a number, or appending a value to the name in the editor. Then,
+run a 'plan' again.
+
+```bash
+terraform plan
+```
+
+Afterwards you can run an apply, which implicitly does a plan and shows you the intended changes
+at the 'yes' prompt.
+
+```bash
+terraform apply
+```
+
+```bash
+yes
+```
+
+## Cleanup
+
+Run the following to remove the resources Terraform provisioned:
+
+```bash
+terraform destroy
+```
+```bash
+yes
+```