Blog / Terraform

Infrastructure as Code with Terraform: Best Practices for AWS

By Vruta Baldha·April 18, 2026·8 min read

Infrastructure as Code turns "it works on the console" into a reviewed, repeatable, version-controlled system. Here are the Terraform practices that keep AWS infrastructure clean as a team grows.

1. Remote state with locking

Store state in an S3 bucket with a DynamoDB lock table. Never keep state on a laptop, remote state lets the whole team (and CI) work safely without clobbering each other.

terraform {
  backend "s3" {
    bucket         = "mycompany-tfstate"
    key            = "prod/network.tfstate"
    region         = "us-east-1"
    dynamodb_table = "tf-locks"
    encrypt        = true
  }
}

2. Build reusable modules

Wrap common patterns (a VPC, an ECS service, an RDS instance) into modules with clear inputs and outputs. You write it once, review it once, and reuse it everywhere, consistently.

3. Separate environments cleanly

Keep dev, staging and prod isolated, separate state and variables per environment. New environments then spin up identically in minutes, with no drift and no "works in staging" surprises.

4. Plan in CI, apply on approval

Run terraform plan automatically on every pull request so reviewers see exactly what will change. apply only after approval. Infrastructure changes become as reviewable as code.

5. Least privilege and no secrets in state

• Scope the Terraform role to only what it manages.
• Keep secrets in AWS Secrets Manager or SSM, referenced, not hard-coded.
• Enable state encryption and restrict who can read the state bucket.