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


In this chapter, you learned that it is possible to define specifically how Ansible perceives a failure or a change when a specific task is run, how to use blocks to gracefully handle errors and perform cleanup, and how to write tight, efficient code using loops.

As a result, you should now be able to alter any given task to provide specific conditions under which Ansible will fail it or consider a change successful. This is incredibly valuable when running shell commands, as we have demonstrated in this chapter, and also serves when defining specialized use cases for existing modules. You should also now be able to organize your Ansible tasks into blocks, ensuring that if failures do occur, recovery actions can be taken that would otherwise not need to be run. Finally, you should now be able to write tight, efficient Ansible playbooks using loops, removing the need for repetitive code and lengthy, inefficient playbooks.

In the next chapter, we'll explore...