Terraform AWS EC2 instance with security groups example — Complete Guide

A practical, in-depth guide to Terraform AWS EC2 instance with security groups example with examples.

INTRO

Provisioning an EC2 instance without a reproducible, version‑controlled definition is a recipe for drift. In fast‑moving teams, you’ll see security groups manually tweaked in the console, IP ranges added ad‑hoc, and instances launched with the wrong AMI. The result? Security audits that raise red flags, unexpected outages, and a nightmare when you try to replicate the environment for staging or disaster recovery.

Terraform gives you a single source of truth for both the compute resource and its network fence. By describing the EC2 instance and its security groups in code, you lock down the attack surface, make changes auditable, and let the same configuration spin up identical machines across accounts or regions.…