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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 resources


There are two ways to define custom resources – via LWRPs (lightweight resource providers) or HWRPs (heavyweight resource providers). Before LWRPs were introduced, all extensions to Chef were written using Ruby, and these are referred to as HWRPs. While LWRPs are simple, a HWRP is extremely flexible. The HWRPs reside in the libraries folder of the cookbook repository. Chef tries to import anything residing there at runtime and is interpreted as code, rather than a Chef DSL. We'll mostly be concerned with LWRPs in this chapter.

A LWRP is meant to extend chef-client so that custom actions can be defined and eventually used in a recipe.

A LWRP has two main components. They are as follows:

  • A lightweight resource that defines a set of actions and attributes

  • A lightweight provider that tells the chef-client how to handle each action

One may use existing resources or custom Ruby code to build a new LWRP. Once a LWRP is ready, it's read every time during the chef-client run and processed...

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