Book Image

Implementing DevOps with Ansible 2

By : Jonathan McAllister
Book Image

Implementing DevOps with Ansible 2

By: Jonathan McAllister

Overview of this book

Thinking about adapting the DevOps culture for your organization using a very simple, yet powerful automation tool, Ansible 2? Then this book is for you! In this book, you will start with the role of Ansible in the DevOps module, which covers fundamental DevOps practices and how Ansible is leveraged by DevOps organizations to implement consistent and simplified configuration management and deployment. You will then move on to the next module, Ansible with DevOps, where you will understand Ansible fundamentals and how Ansible Playbooks can be used for simple configuration management and deployment tasks. After simpler tasks, you will move on to the third module, Ansible Syntax and Playbook Development, where you will learn advanced configuration management implementations, and use Ansible Vault to secure top-secret information in your organization. In this module, you will also learn about popular DevOps tools and the support that Ansible provides for them (MYSQL, NGINX, APACHE and so on). The last module, Scaling Ansible for the enterprise, is where you will integrate Ansible with CI and CD solutions and provision Docker containers using Ansible. By the end of the book you will have learned to use Ansible to leverage your DevOps tasks.
Table of Contents (20 chapters)
Title Page
Credits
About the Author
Acknowledgments
About the Reviewer
www.PacktPub.com
Customer Feedback
Preface

Jinja2 Programming Constructs


Jinja2 was incorporated into the Ansible architecture back in 2012 when Ansible 0.5 was released. The implementation of Ansible at the time incorporated the concept of Jinja2 filters and supported basic Jinja2 syntax. As ansible evolved, so did its developer support for Jinja. By coupling YAML and Jinja2, Ansible was soon able to provide a comprehensive scripting-oriented solution for Ansible playbook developers.

By the time Ansible 1.0 was released, the Ansible playbook concept (including Jinja and YAML) had evolved enough to support a wide array of syntax implementations. As a result of the integration of YAML, Jinja and Ansible's popularity skyrocketed. After the release of Ansible 1.0, playbooks could be authored to incorporate the following syntaxes:

Jinja tag syntax:

{{ .. }} for expressions (including variables)
{% ... %} for control structures
{# ... #}} Comments

Each of these tags serves a unique role within the Jinja universe, and it is important to understand...