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Mastering Ansible, Second Edition

Mastering Ansible, Second Edition

By : Keating
3.8 (8)
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Mastering Ansible, Second Edition

Mastering Ansible, Second Edition

3.8 (8)
By: Keating

Overview of this book

This book provides you with the knowledge you need to understand how Ansible 2.1 works at a fundamental level and leverage its advanced capabilities. You'll learn how to encrypt Ansible content at rest and decrypt data at runtime. You will master the advanced features and capabilities required to tackle the complex automation challenges of today and beyond. You will gain detailed knowledge of Ansible workflows, explore use cases for advanced features, craft well thought out orchestrations, troubleshoot unexpected behaviour, and extend Ansible through customizations. Finally, you will discover the methods used to examine and debug Ansible operations, helping you to understand and resolve issues. By the end of the book, the readers will be able to unlock the true power of the Ansible automation engine and will tackle complex real world actions with ease.
Table of Contents (10 chapters)
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Failing fast


When performing an upgrade of an application, it may be desirable to fully stop the deployment at any sign of error. A partially upgraded system with mixed versions may not work at all, so continuing with part of the infrastructure while leaving the failed systems behind can lead to big problems. Fortunately, Ansible provides a mechanism to decide when to reach a fatal error scenario.

By default, when Ansible is running through a playbook and encounters an error, Ansible will remove the failed host from the list of play hosts and continue with the tasks or plays. Ansible will stop executing once either all the requested hosts for a play have failed, or all the plays have been completed. To change this behavior, there are a couple of play controls that can be employed. Those controls are any_errors_fatal and max_fail_percentage.

The any_errors_fatal option

This setting instructs Ansible to consider the entire operation to be fatal and stop executing immediately if any host encounters...

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