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Mastering Chef

You're reading from   Mastering Chef Build, deploy, and manage your IT infrastructure to deliver a successful automated system with Chef in any environment

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Product type Paperback
Published in Jun 2015
Publisher
ISBN-13 9781783981564
Length 374 pages
Edition 1st Edition
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Author (1):
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Mayank Joshi Mayank Joshi
Author Profile Icon Mayank Joshi
Mayank Joshi
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Table of Contents (15) Chapters Close

Preface 1. Introduction to the Chef Ecosystem FREE CHAPTER 2. Knife and Its Associated Plugins 3. Chef and Ruby 4. Controlling Access to Resources 5. Starting the Journey to the World of Recipes 6. Cookbooks and LWRPs 7. Roles and Environments 8. Attributes and Their Uses 9. Ohai and Its Plugin Ecosystem 10. Data Bags and Templates 11. Chef API and Search 12. Extending Chef 13. (Ab)Using Chef Index

Role and environment attributes


We can define an attribute in a role or an environment and use it to override the default settings on a node. When a role or an environment is applied during a chef-client run, the attributes defined in them are compared against those already present on the node. Finally, depending on the precedence order, the right attributes are applied to the node.

A role or environment attribute can be either a default attribute or an override attribute. It can't be a normal attribute.

A default attribute is automatically reset at every start of chef-client runs and has the lowest attribute precedence. Any cookbook should be authored to make the most of default attributes.

An override attribute, on the other hand, has higher attribute precedence over the default, force_default, and normal attributes. A cookbook should be authored to make use of override_attribute only when required.

Attribute precedence

Attributes are always applied to a machine by chef-client in the following...

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