Book Image

Getting Started with Terraform - Second Edition

By : Kirill Shirinkin
1 (1)
Book Image

Getting Started with Terraform - Second Edition

1 (1)
By: Kirill Shirinkin

Overview of this book

Terraform is a tool used to efficiently build, configure, and improve the production infrastructure. It can manage the 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 the complete management of infrastructure with Terraform, starting with the basics of using providers and resources. It 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. The book ends with the complete workflow of managing a production infrastructure as code—this is achieved with the help of version control and continuous integration. The readers will also learn how to combine multiple providers in a single template and manage different code bases with many complex modules. It focuses on how to set up continuous integration for the infrastructure code. The readers will be able to use Terraform to build, change, and combine infrastructure safely and efficiently.
Table of Contents (15 chapters)
Title Page
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 output 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 the 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 = [""] 
  egress { 
    from_port =...