Three Tier Azure Infra

This repository contains the terraform code responsible for creating classic three tier setup.

Prerequisites

1. Azure account
2. Azure CLI
3. Az login
4. Terraform
5. public key and private key for VMs at ./compute/vm-access.pem amd ./compute/vm-access.pub

Approach

1. User sends a request to a LB in gateway subnet which accepts traffic on port 80
2. Request is then routed to web VMs in web subnet
3. Web VMs then sends requests to Logic LB in logic subnet on port 3000
4. Logic VMs then queries a DB instance in data subnet through data LB on port 3306

Considerations

1. VMs in vnet are only accesible from Bastion Hosts
2. Subnets are locked down to accept traffic from intended subnets only

Design and Request Flow

Technical Design

High Level

Create Azure Diagram with AzViz

Low Level

Create Azure Diagram with AzViz

Resources

Useful Commands

# module initialisation
terraform init

# format code
terraform format

# validate code
terraform validate

# apply
terraform apply

# destroy
terraform destroy