Root module concept in Terraform - Mini Project: Build & Apply

Terraform Root Module Setup

📖 Scenario: You are setting up a basic Terraform project to manage cloud infrastructure. The root module is the main folder where Terraform configuration files live. It defines resources and variables for your infrastructure.

🎯 Goal: Build a simple Terraform root module that defines a provider and a resource with variables.

📋 What You'll Learn

Create a Terraform configuration file named main.tf.

Define the aws provider with a region variable.

Create a resource of type aws_s3_bucket with a bucket name variable.

Use variables for region and bucket name with default values.

💡 Why This Matters

🌍 Real World

Terraform root modules are the starting point for managing cloud infrastructure as code. They organize resources and variables in one place.

💼 Career

Understanding root modules is essential for cloud engineers and DevOps professionals to build and maintain infrastructure reliably and repeatably.

1

Create the Terraform provider block

In the main.tf file, write a Terraform provider block for aws using the variable region for the region setting.

Terraform

# Your code here

Need a hint?

The provider block tells Terraform which cloud provider to use. Use var.region to get the region from a variable.

2

Add variables for region and bucket name

Below the provider block in main.tf, add two variable blocks named region and bucket_name. Set their default values to "us-east-1" and "my-terraform-bucket" respectively.

Terraform

provider "aws" {
  region = var.region
}

# Your code here

Need a hint?

Variables let you customize your Terraform configuration. Use variable "name" { default = "value" } syntax.

3

Create an S3 bucket resource using the bucket_name variable

Add a resource block of type aws_s3_bucket named my_bucket in main.tf. Set the bucket attribute to use the variable bucket_name.

Terraform

provider "aws" {
  region = var.region
}

variable "region" {
  default = "us-east-1"
}

variable "bucket_name" {
  default = "my-terraform-bucket"
}

# Your code here

Need a hint?

Resources define infrastructure components. Use resource "type" "name" { attribute = value } syntax.

4

Add output to show the bucket name

Add an output block named bucket_name_output in main.tf that outputs the value of the aws_s3_bucket.my_bucket.bucket attribute.

Terraform

provider "aws" {
  region = var.region
}

variable "region" {
  default = "us-east-1"
}

variable "bucket_name" {
  default = "my-terraform-bucket"
}

resource "aws_s3_bucket" "my_bucket" {
  bucket = var.bucket_name
}

# Your code here

Need a hint?

Outputs let you see important information after Terraform applies changes. Use output "name" { value = ... } syntax.