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

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 main template. Let's first create our MightyTrousers module with terraform apply (you can remove 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 bastion host IP to your test suite. We will talk more about...