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Mastering Ansible

Mastering Ansible

4.6 (15)
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Mastering Ansible

Mastering Ansible

4.6 (15)

Overview of this book

Automation is critical to success in the world of DevOps. How quickly and efficiently an application deployment can be automated, or a new infrastructure can be built up, can be the difference between a successful product or a failure. Ansible provides a simple yet powerful automation engine. Beyond the basics of Ansible lie a host of advanced features which are available to help you increase efficiency and accomplish complex orchestrations with ease. This book provides you with the knowledge you need to understand how Ansible 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.
Table of Contents (10 chapters)
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Data manipulation

While control structures influence the flow of template processing, another tool exists to modify the contents of a variable. This tool is called a filter. Filters are like small functions, or methods, that can be run on the variable. Some filters operate without arguments, some take optional arguments, and some require arguments. Filters can be chained together as well, where the result of one filter action is fed into the next filter and the next. Jinja2 comes with many built-in filters, and Ansible extends these with many custom filters available to you when using Jinja2 within templates, tasks, or any other place Ansible allows templating.

Syntax

A filter is applied to a variable by way of the pipe symbol (|), followed by the name of the filter and then any arguments for the filter inside parentheses. There can be a space between the variable name and the pipe symbol, as well as a space between the pipe symbol and the filter name. For example, if we wanted to apply the...

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