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

Using root module outputs

We already know that even our file is a module, named root module. And as with any module, it also has outputs. There is a terraform output command that retrieves outputs from your configuration. You can use it with modules, as well as with the main template. Let's first create our MightyTrousers module with terraform apply (you can remove the CrazyFoods module from for now, just to avoid extra AWS costs).

After the application is complete, run the terraform output command with the module name specified:

$> terraform output -module=mighty_trousers hostname

As an exercise, add the output to, it will get its value from the module output, and try to retrieve it by simply running the terraform output hostname.

Outputs are a simple yet powerful way to connect Terraform with all kinds of different tools. For example, you could output a bastion host IP to your test suite. We will talk more...