Book Image

Terraform Cookbook

By : Mikael Krief
Book Image

Terraform Cookbook

By: Mikael Krief

Overview of this book

HashiCorp Configuration Language (HCL) has changed how we define and provision a data center infrastructure with the launch of Terraform—one of the most popular and powerful products for building Infrastructure as Code. This practical guide will show you how to leverage HashiCorp's Terraform tool to manage a complex infrastructure with ease. Starting with recipes for setting up the environment, this book will gradually guide you in configuring, provisioning, collaborating, and building a multi-environment architecture. Unlike other books, you’ll also be able to explore recipes with real-world examples to provision your Azure infrastructure with Terraform. Once you’ve covered topics such as Azure Template, Azure CLI, Terraform configuration, and Terragrunt, you’ll delve into manual and automated testing with Terraform configurations. The next set of chapters will show you how to manage a balanced and efficient infrastructure and create reusable infrastructure with Terraform modules. Finally, you’ll explore the latest DevOps trends such as continuous integration and continuous delivery (CI/CD) and zero-downtime deployments. By the end of this book, you’ll have developed the skills you need to get the most value out of Terraform and manage your infrastructure effectively.
Table of Contents (10 chapters)

Importing existing resources

So far in this book, we have seen the normal use of Terraform, which is to write a Terraform configuration that is going to be executed and applied by Terraform. This execution will provision or apply changes to an infrastructure that will be reflected in the Terraform state file.

In certain scenarios, however, it may be necessary to import resources that have already been provisioned into the Terraform state file. Examples of such scenarios include the following:

  • Resources have been provisioned manually (or by scripts) and now it is desired that their configuration is in the Terraform configuration and in the state file.

  • A Terraform state file that contains the configuration of an infrastructure has been corrupted or deleted and regeneration is desirable.

In this recipe, we will discuss how, with the assistance of Terraform commands, we can import the configuration of resources that have already been provisioned into the Terraform state file.