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

Approaches for managing environments


You have already learned about the need to create different environments with identical roles, but with different data. At the time of writing this, more than one approach exists for managing such multiple environment scenarios with Ansible. We are going to discuss two approaches here, and you can use your best judgment to pick either of the two or create your own approach. There is no explicit way to create an environment, but the following are the built-in features of Ansible, which could come in handy:

  • The use of an inventory to group together hosts that belong to one environment and isolate them from the hosts in other environments

  • The use of inventory variables, such as the group_vars and host_vars groups, to provide environment-specific variables

Before we proceed, it would be useful to review the inventory groups, variables, and precedence rules that are applicable to them.

The inventory groups and variables

You have already learned learned that the...