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Mastering Ansible, 4th Edition

You're reading from   Mastering Ansible, 4th Edition Automate configuration management and overcome deployment challenges with Ansible

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Product type Paperback
Published in Dec 2021
Publisher Packt
ISBN-13 9781801818780
Length 540 pages
Edition 4th Edition
Tools
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Authors (2):
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Jesse Keating Jesse Keating
Author Profile Icon Jesse Keating
Jesse Keating
James Freeman James Freeman
Author Profile Icon James Freeman
James Freeman
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Table of Contents (18) Chapters Close

Preface 1. Section 1: Ansible Overview and Fundamentals
2. Chapter 1: The System Architecture and Design of Ansible FREE CHAPTER 3. Chapter 2: Migrating from Earlier Ansible Versions 4. Chapter 3: Protecting Your Secrets with Ansible 5. Chapter 4: Ansible and Windows – Not Just for Linux 6. Chapter 5: Infrastructure Management for Enterprises with AWX 7. Section 2: Writing and Troubleshooting Ansible Playbooks
8. Chapter 6: Unlocking the Power of Jinja2 Templates 9. Chapter 7: Controlling Task Conditions 10. Chapter 8: Composing Reusable Ansible Content with Roles 11. Chapter 9: Troubleshooting Ansible 12. Chapter 10: Extending Ansible 13. Section 3: Orchestration with Ansible
14. Chapter 11: Minimizing Downtime with Rolling Deployments 15. Chapter 12: Infrastructure Provisioning 16. Chapter 13: Network Automation 17. Other Books You May Enjoy

Comparing values

Comparisons are used in many places with Ansible. Task conditionals are comparisons. Jinja2 control structures, such as if/elif/else blocks, for loops, and macros, often use comparisons; some filters use comparisons as well. To master Ansible's usage of Jinja2, it is important to understand what comparisons are available.

Comparisons

Like most languages, Jinja2 comes equipped with the standard set of comparison expressions you would expect, which will render a Boolean true or false.

The expressions in Jinja2 are as follows:

If you have written comparison operations in almost any other programming language (usually in the form of an if statement), these should all seem very familiar. Jinja2 maintains this functionality in templates, allowing for the same powerful comparison operations you would expect in conditional logic from any good programming language.

Logic

Sometimes, performing a single...

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