Book Image

Ansible Playbook Essentials

By : Gourav Shah, GOURAV JAWAHAR SHAH
Book Image

Ansible Playbook Essentials

By: Gourav Shah, GOURAV JAWAHAR SHAH

Overview of this book

Ansible Playbook Essentials will show you how to write a blueprint of your infrastructure, encompassing multitier applications using Ansible's playbooks. Beginning with basic concepts such as plays, tasks, handlers, inventory, and YAML Ain't Markup Language (YAML) syntax that Ansible uses, you'll understand how to organize your code into a modular structure. Building on this, you will study techniques to create data-driven playbooks with variables, templates, logical constructs, and encrypted data, which will further strengthen your application skills in Ansible. Adding to this, the book will also take you through advanced clustering concepts, such as discovering topology information about other nodes in the cluster and managing multiple environments with isolated configurations. As you approach the concluding chapters, you can expect to learn about orchestrating infrastructure and deploying applications in a coordinated manner. By the end of this book, you will be able to design solutions to your automation and orchestration problems using playbooks quickly and efficiently.
Table of Contents (20 chapters)
Ansible Playbook Essentials
Credits
About the Author
Acknowledgments
About the Reviewers
www.PacktPub.com
Preface
Setting Up the Learning Environment
References
Index

Summary


We started this chapter by learning about why and how to separate data from code using Ansible variables, facts, and Jinja2 templates. You learnt how to create data-driven roles by providing variables and facts in templates, tasks, handlers, and playbooks. Additionally, we created a new role for the database tier, which supports both the Debian and RedHat families of operating systems. You learnt what system facts are and how they are discovered and used. You learnt how variables can be specified from more than one place, how they are merged, and the precedence rules. Finally, you learnt about the best practices for using variables.

In the next chapter, we will work with custom commands and scripts, understand what registered variables are, and deploy a sample WordPress application using all this information.