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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

Custom plugins

For most purpose, the plugins provided by Ohai will be good enough. However, sooner or later, one lands up in a situation where one wants some attributes associated with nodes being provisioned, and these attributes define a system-level property that can be used to make certain decisions during the chef-client run. For such cases, Ohai provides us with the ability to write our own custom plugins. Ohai provides a very simple DSL that can be used for this purpose. For example, we run a large number of machines on AWS and there are different kinds of machines available known by different names such as m1.xlarge, c1.xlarge, and so on. We want to push different configurations on the basis of different types of EC2 instance. So, we go ahead and write our plugin that emits an attribute called node['machine_type']. Now, in our cookbooks, we can make use of this attribute to decide which config to push to the node.

A custom plugin describes a set of attributes to be collected...

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