Book Image

HashiCorp Infrastructure Automation Certification Guide

By : Ravi Mishra
Book Image

HashiCorp Infrastructure Automation Certification Guide

By: Ravi Mishra

Overview of this book

Terraform is a highly sought-after technology for orchestrating infrastructure provisioning. This book is a complete reference guide to enhancing your infrastructure automation skills, offering up-to-date coverage of the HashiCorp infrastructure automation certification exam. This book is written in a clear and practical way with self-assessment questions and mock exams that will help you from a HashiCorp infrastructure automation certification exam perspective. This book covers end-to-end activities with Terraform, such as installation, writing its configuration file, Terraform modules, backend configurations, data sources, and infrastructure provisioning. You'll also get to grips with complex enterprise infrastructures and discover how to create thousands of resources with a single click. As you advance, you'll get a clear understanding of maintaining infrastructure as code (IaC) in Repo/GitHub, along with learning how to create, modify, and remove infrastructure resources as and when needed. Finally, you'll learn about Terraform Cloud and Enterprise and their enhanced features. By the end of this book, you'll have a handy, up-to-date desktop reference guide along with everything you need to pass the HashiCorp Certified: Terraform Associate exam with confidence.
Table of Contents (17 chapters)
1
Section 1: The Basics
4
Section 2: Core Concepts
10
Section 3: Managing Infrastructure with Terraform
14
Chapter 11: Terraform Glossary

Understanding Terraform variables

In an earlier section, you learned about how you can write a resource code block in the Terraform configuration file. In that resource code block, we either hardcoded argument values or we referenced them from another resource code block. Now, we will try to understand how we can define those hardcoded values in a variable and define them in a separate file that can be used again and again.

Terraform variables

If you have basic experience of writing any scripting or programming language, you must have noticed that we can define some variables and use those defined variables again and again in the whole script. Likewise, in other programming languages, Terraform also supports variables that can be defined in the Terraform configuration code. The only difference between other programming language variables and Terraform variables is that, in Terraform variables, you are supposed to define input values when you want to execute your Terraform configuration...