Book Image

Mastering Ansible, 4th Edition - Fourth Edition

By : James Freeman, Jesse Keating
Book Image

Mastering Ansible, 4th Edition - Fourth Edition

By: James Freeman, Jesse Keating

Overview of this book

Ansible is a modern, YAML-based automation tool (built on top of Python, one of the world’s most popular programming languages) with a massive and ever-growing user base. Its popularity and Python underpinnings make it essential learning for all in the DevOps space. This fourth edition of Mastering Ansible provides complete coverage of Ansible automation, from the design and architecture of the tool and basic automation with playbooks to writing and debugging your own Python-based extensions. You'll learn how to build automation workflows with Ansible’s extensive built-in library of collections, modules, and plugins. You'll then look at extending the modules and plugins with Python-based code and even build your own collections — ultimately learning how to give back to the Ansible community. By the end of this Ansible book, you'll be confident in all aspects of Ansible automation, from the fundamentals of playbook design to getting under the hood and extending and adapting Ansible to solve new automation challenges.
Table of Contents (18 chapters)
Section 1: Ansible Overview and Fundamentals
Section 2: Writing and Troubleshooting Ansible Playbooks
Section 3: Orchestration with Ansible

Chapter 2: Migrating from Earlier Ansible Versions

As Ansible has grown over the years, certain headaches have presented themselves to the team that develops and manages the Ansible code base. In many ways, these headaches have been the price of Ansible's own growth and success, and have resulted in a need to structure the code a little differently. Indeed, anyone with a little prior experience of Ansible from versions before 2.10 will have noticed that our example code presented in this book looks a little different, along with a new term, Collections.

In this chapter, we will explain these changes in detail, along with how they came about. We will then take you through some practical examples so you can see how these changes work in the real world, before finally teaching you how to migrate any existing or legacy playbooks you might have to Ansible 4.3 and beyond.

Specifically, in this chapter, we will cover the following topics:

  • Changes in Ansible 4.3
  • Upgrading...