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Ansible Playbook Essentials

Ansible Playbook Essentials

By : Shah
4.4 (14)
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Ansible Playbook Essentials

Ansible Playbook Essentials

4.4 (14)
By: 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 (14 chapters)
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1
Setting Up the Learning Environment
12
A. References
13
Index

Chapter 5. Controlling Execution Flow – Conditionals

Control structures refer to anything and everything that have an effect on a program's execution flow. Control structures are mainly of the following two types:

  • Conditional
  • Iterative

At times, we need to execute code conditionally based on a value of a variable, type of platform, or even a result of some other command. There are times when we also need to iterate multiple objects, such as list hashes or multilevel variables.

Most programming languages and tools use powerful but machine-friendly constructs, such as if else, for, unless, do while, and so on. However, Ansible stays true to its design tenet of being a human-friendly automation language and manages to achieve the same with the omnipotent when and with_* constructs, which are closer to the English language. Let's begin to explore how it does so.

In this chapter, we are going to cover the following topics:

  • Using conditional controls with the when statements...
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Ansible Playbook Essentials
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