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

Configuring modules

Let's list the data we need to pass to the module:

  • Name of the application
  • VPC ID
  • Subnet ID

That should be sufficient for now. Update the module inside to look as follows:

module "mighty_trousers" { 
  source = "./modules/application" 
  vpc_id = "${}" 
  subnet_id = "${}" 
  name = "MightyTrousers" 

Passing data like this is not enough though. We need to define variables inside the module template. The thing is, our is a module itself, a special module named root module. That's what you saw on the last graph we drew--resources were coming from the root module. So, we were actually already using modules all this time, and every module, including the root module, can be configured with variables.


We have not looked much into Terraform variables in general till now, and most of the content on this topic is explained in Chapter 4,Storing and Supplying Configuration. For now, let's get a short introduction to them...