Three-tier web app

This repository contains the Terraform deployed by the Jump Start Solution (JSS) titled Three-tier web application. The source code for web application (frontend and middle tier) deployed by this JSS can be found at github.com/GoogleCloudPlatform/deploystack-three-tier-app.

Tagline

Create a web app using a three-tiered architecture

Detailed

This solution quickly and securely creates a web app using a three-tiered architecture with a front end, middleware, and back end (PostgreSQL database). You can choose whether to deploy your solution through the console directly or download as Terraform on GitHub to deploy later.

Architecture

1. User requests are sent to the front end, which is deployed on two Cloud Run services as containers to support high scalability applications.
2. The request then lands on the middle tier, which is the API layer that provides access to the backend. This is also deployed on Cloud Run for scalability and ease of deployment in multiple languages. This middleware is a Golang based API.
3. The frequent requests are cached in Memorystore for Redis for serving the request fast in-memory. The response is then served back to the user.
4. For new requests from the users, Cloud SQL provides the backend as the database layer. The response is then served back to the user.
5. For DevOps, Cloud Build packages up the containers and deploys them to be available as Cloud Run services.

Documentation

• Architecture Diagram

Usage

Basic usage of this module is as follows:

module "three_tier_app" {
  source  = "terraform-google-modules/three-tier-app/google"
  version = "~> 0.1"

  project_id  = var.project_id
  region = "us-central1"
  zone = "us-central1-a"
}

Functional examples are included in the examples directory.

Inputs

Name	Description	Type	Default	Required
database_type	Cloud SQL Database flavor, mysql or postgresql	string	"postgresql"	no
deployment_name	The name of this particular deployment, will get added as a prefix to most resources.	string	"three-tier-app"	no
enable_apis	Whether or not to enable underlying apis in this solution. .	string	true	no
labels	A map of labels to apply to contained resources.	map(string)	{ "three-tier-app": true }	no
project_id	The project ID to deploy to	string	n/a	yes
region	The Compute Region to deploy to	string	"us-central1"	no
run_roles_list	The list of roles that run needs	list(string)	[ "roles/cloudsql.instanceUser", "roles/cloudsql.client" ]	no
zone	The Compute Zone to deploy to	string	"us-central1-a"	no

Outputs

Name	Description
endpoint	The url of the front end which we want to surface to the user
neos_toc_url	The URL to launch the in-console tutorial for the Three Tier App solution
sqlservername	The name of the database that we randomly generated.

Requirements

These sections describe requirements for using this module.

Software

The following dependencies must be available:

• Terraform v0.13
• Terraform Provider for GCP plugin v3.0

Service Account

A service account with the following roles must be used to provision the resources of this module:

• Storage Admin: roles/storage.admin

The Project Factory module and the IAM module may be used in combination to provision a service account with the necessary roles applied.

APIs

A project with the following APIs enabled must be used to host the resources of this module:

• Google Cloud Storage JSON API: storage-api.googleapis.com

The Project Factory module can be used to provision a project with the necessary APIs enabled.

Contributing

Refer to the contribution guidelines for information on contributing to this module.

Security Disclosures

Please see our security disclosure process.