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Advanced 22 min readModule: Module 9: Infrastructure as Code (IaC) with Terraform

Terraform & Declarative Infrastructure as Code

Provision cloud infrastructure (AWS/GCP VPCs, databases, clusters) declaratively using HashiCorp Terraform.

What You Will Learn in This Lesson

  • HashiCorp Configuration Language (HCL) syntax and providers
  • The Terraform workflow: init, plan (dry-run preview), and apply
  • Managing remote state files (terraform.tfstate) in S3 with DynamoDB state locking

Introduction & Core Concept

Infrastructure as Code (IaC) allows you to define, provision, and manage cloud servers, networks, and databases using human-readable configuration files.
WHY DOES THIS MATTER IN THE REAL WORLD?

IaC eliminates manual console clicking errors, allows infrastructure changes to be reviewed in PRs, and enables rebuilding an entire cloud region in minutes.

Terraform AWS S3 Bucket Provisioning

hcl
hcl
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terraform {
  required_providers {
    aws = {
      source  = "hashicorp/aws"
      version = "~> 5.0"
    }
  }
}
 
provider "aws" {
  region = "us-east-1"
}
 
resource "aws_s3_bucket" "kwas_assets" {
  bucket = "kwas-academy-production-assets"
}

Line-by-Line Technical Breakdown

1terraform plan computes the diff between real cloud state and desired configuration.

Try It Yourself (Interactive Editor)

Modify the code in real-time and click Run to test live browser output and console logs.

Intelligent Code Runner & Live Sandbox[HCL]
HCL SOURCE EDITOR
Interactive Live Code

Industry Best Practices & Professional Standards

  • Always run 'terraform plan' and verify the execution plan before running 'terraform apply'.

Lesson Summary & Core Takeaways

  • Terraform turns cloud infrastructure into version-controlled, reproducible software.