Book Image

Getting Started with Terraform

By : Kirill Shirinkin
Book Image

Getting Started with Terraform

By: Kirill Shirinkin

Overview of this book

Terraform is a tool used to efficiently build, configure, and improve production infrastructure. It can manage existing infrastructure as well as create custom in-house solutions. This book shows you when and how to implement infrastructure as a code practices with Terraform. It covers everything necessary to set up complete management of infrastructure with Terraform, starting with the basics of using providers and resources. This book is a comprehensive guide that begins with very small infrastructure templates and takes you all the way to managing complex systems, all using concrete examples that evolve over the course of the book. It finishes with the complete workflow of managing a production infrastructure as code – this is achieved with the help of version control and continuous integration. At the end of this book, you will be familiar with advanced techniques such as multi-provider support and multiple remote modules.
Table of Contents (15 chapters)
Getting Started with Terraform
About the Author
About the Reviewer
Customer Feedback

Removing duplication with modules

Modules in Terraform are used to group multiple resources. You can reuse this grouping multiple times. You can also configure modules with variables, and modules can return outputs that you can pass to other resources and modules.

To get started with modules, create a folder named modules in the same folder as the Inside this folder, create another one, named application. In this folder, we will keep the module, responsible for creating all resources required by a single application, be it MightyTrousers, CrazyFoods, or anything else.

A module is a regular Terraform template, so just create the ./modules/application/ file with the following contents:

resource "aws_security_group" "allow_http" { 
  name = "allow_http" 
  description = "Allow HTTP traffic" 
  vpc_id = "${}" 
  ingress { 
    from_port = 80 
    to_port = 80 
    protocol = "tcp" 
    cidr_blocks = ["