Terraform block - module

A module in Terraform is a container for multiple resources that are used together. Modules can be:

• Local: in a subfolder.
• Remote: GitHub, Terraform Registry, etc. (e.g. source = “terraform-aws-modules/vpc/aws”)

Why?

• Code resuability
• simplified management with manageable components
• consistent deployment

Basic Structure File Tree Example:

main.tf
modules/
└── s3_bucket/
    ├── main.tf
    ├── variables.tf
    └── outputs.tf

Inside the module (modules/s3_bucket/) main.tf

resource "aws_s3_bucket" "this" {
  bucket = var.bucket_name
  acl    = "private"
}

variables.tf

variable "bucket_name" {
  type = string
}

outputs.tf

output "bucket_id" {
  value = aws_s3_bucket.this.id
}

Calling the module (main.tf in root)

provider "aws" {
  region = "us-east-1"
}

module "my_bucket" {
  source      = "./modules/s3_bucket"
  bucket_name = "stanley-test-bucket"
}