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Mastering Ansible

You're reading from   Mastering Ansible Effectively automate configuration management and deployment challenges with Ansible 2.7

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Product type Paperback
Published in Mar 2019
Publisher Packt
ISBN-13 9781789951547
Length 412 pages
Edition 3rd 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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Toc

Table of Contents (17) Chapters Close

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

Variable precedence

As you learned in the previous section, there are several major types of variables that can be defined in a myriad of locations. This leads to a very important question: what happens when the same variable name is used in multiple locations? Ansible has a precedence for loading variable data, and thus it has an order and a definition to decide which variable will win. Variable value overriding is an advanced usage of Ansible, so it is important to fully understand the semantics before attempting such a scenario.

Precedence order

Ansible defines the precedence order as follows, with those closest to the top of the list winning. Note that this can change from release to release, and has changed quite significantly...

You have been reading a chapter from
Mastering Ansible - Third Edition
Published in: Mar 2019
Publisher: Packt
ISBN-13: 9781789951547
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