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)

Provisioning multiple resources with the count property

In corporate scenarios, there is a need to provide infrastructure and to take into account the so-called horizontal scalability, that is, N identical resources that will reduce the load on individual resources (such as compute instances) and the application as a whole.

The challenge we will have to face is as follows:

  • Writing Terraform configuration that does not require duplicate code for each instance of identical resources to be provisioned

  • Being able to rapidly increase or reduce the number of instances of these resources

We will see in this recipe how Terraform makes it possible to provision N instances of resources quickly and without the duplication of code.

Getting ready

To begin, we will use a Terraform configuration that allows us to provision one Azure App Service, which is in a main.tf file and of which the following is an extract:

resource "azurerm_app_service" "app" {
name ...