Terraform Azure Infrastructure Module for Todo List Application

This repository contains a comprehensive Terraform configuration designed to provision the infrastructure required for a Todo List application on Microsoft Azure.

The project heavily emphasizes Terraform modularity and best practices, structuring the deployment into logical, reusable components.

🏗 Project Architecture & Terraform Modules

The infrastructure is broken down into specific, purpose-built Terraform modules to ensure clean code, reusability, and easy maintainability.

1. Root Module

The root directory serves as the main entry point for the infrastructure deployment.

• main.tf: Orchestrates the execution of child modules and creates the base Azure Resource Group.
• variables.tf / terraform.tfvars: Centralized configuration for input parameters (locations, sizes, names).
• outputs.tf: Defines the essential outputs like the VM's Public IP to access the deployed application.
• backend.tf: Configures the remote state backend using Azure Blob Storage for secure state management and team collaboration.

2. Network Module (modules/network)

Responsible for all networking components.

• Virtual Network (VNet) & Subnet: Creates the isolated network environment.
• Network Security Group (NSG): Implements security rules (e.g., allowing SSH and HTTP traffic).
• Public IP Address: Provisions a dynamically allocated Public IP with a custom DNS label.

3. Compute Module (modules/compute)

Responsible for provisioning the virtual machine and bootstrapping the application.

• Network Interface (NIC): Attaches the VM to the created Subnet and Public IP.
• Virtual Machine: Provisions an Ubuntu 22.04 VM (Standard_B1s by default) using SSH key authentication.
• VM Extension (CustomScript): Automatically executes the install-app.sh script during the VM creation phase to install dependencies and deploy the Todo List application without manual intervention.

4. Storage Module (modules/storage)

Responsible for auxiliary storage requirements.

• Storage Account & Container: Provisions an Azure Storage Account and a specific container (task-artifacts) which can be used for application backups, state files, or artifact storage.

🚀 Getting Started

Prerequisites

• Terraform installed (v1.0+ recommended)
• Azure CLI installed and authenticated (az login)
• An active Azure Subscription

Deployment Steps

1. Clone the repository:

   git clone <repository-url>
   cd Terraform_Azure_Module

2. Configure your variables: Review variables.tf and customize the values in terraform.tfvars if necessary (e.g., provide your ssh_key_public content).

3. Initialize Terraform: This command downloads the required providers (like azurerm) and initializes the remote backend.

   terraform init

4. Review the execution plan: See exactly what resources Terraform will create before actually making changes.

   terraform plan

5. Apply the configuration: Provision the resources on Azure. Type yes when prompted.

   terraform apply

6. Access the Application: Once applied, Terraform will output the Public IP address of the newly created VM. Open that IP in your web browser to access the Todo List application.

🧹 Cleanup

To avoid incurring unwanted charges, destroy the infrastructure when you are done:

terraform destroy