Multi-Environment-Web-Application-Using-Terraform

This repository contains Terraform code to provision a scalable and highly available infrastructure on AWS. The infrastructure is designed to host a web application and includes networking, compute, database, and monitoring components.

Architecture

The infrastructure is composed of the following AWS resources:

• VPC: A Virtual Private Cloud (VPC) to provide an isolated network environment.
• Subnets: Public and private subnets across multiple Availability Zones for high availability.
• Internet Gateway: To provide internet access to the public subnets.
• NAT Gateway: To allow instances in the private subnets to access the internet for updates.
• Application Load Balancer (ALB): To distribute incoming traffic across the web servers.
• Auto Scaling Group: To automatically scale the number of web servers based on CPU utilization.
• EC2 Instances: Web servers running a generic Amazon Linux 2 AMI.
• RDS Instance: A MySQL database for data persistence, configured for high availability with Multi-AZ.
• CloudWatch: For monitoring and alerting.

Modules

The Terraform code is organized into modules for better reusability and maintainability:

• networking: Creates the VPC, subnets, route tables, internet gateway, NAT gateway, and security groups.
• compute: Provisions the Application Load Balancer, Auto Scaling Group, and launch template for the web servers.
• database: Sets up the RDS MySQL database, including a DB subnet group and parameter group.
• monitoring: Configures a CloudWatch dashboard and alarms for monitoring the application's health.

Environments

The repository is structured to support multiple environments, such as dev and prod. Each environment has its own directory under terraform/environments, with its own main.tf, variables.tf, and terraform.tfvars files. This allows for environment-specific configurations.

Prerequisites

Before you can use this Terraform code, you need to have the following:

• AWS Account: An active AWS account with the necessary permissions to create the resources defined in the code.
• Terraform: Terraform installed on your local machine.
• AWS CLI: The AWS Command Line Interface (CLI) installed and configured with your AWS credentials.

Usage

To deploy the infrastructure, follow these steps:

1. Clone the repository:

   git clone https://github.com/PreciousDipe/Multi-Environment-Web-Application-Using-Terraform.git
   cd Multi-Environment-Web-Application-Using-Terraform

2. Navigate to the desired environment directory:

   cd terraform/environments/dev

3. Initialize Terraform:

   terraform init

4. Review the plan:

   terraform plan

5. Apply the changes:

   terraform apply

To destroy the infrastructure, run the following command in the environment directory:

terraform destroy