Automating AWS VPC and Security Group Deployment with Terraform

Introduction

Manual VPC configuration leads to errors and security gaps. Defining network environments in Terraform makes them testable and repeatable.

Core VPC Design Principles

• Public & Private Subnets: Databases should never have public IPs.
• NAT Gateways: Allow private instances to fetch updates securely.
• Least Privilege Security Groups: Restrict ingress traffic to explicit CIDR blocks and ports.

Example Configuration

Using modular Terraform, developers can provision identical environments for Staging and Production in minutes.