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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

Attribute naming


This can be confusing for some people, especially those who aren't coming from the Ruby world. You looked up two different cookbooks and, in one of them, you found something like the following in the attributes file:

default[:app][:user] = "web-admin"

On the other hand, the other cookbook had something like the following:

default['app]['user'] = "web-admin"

These are two different styles of specifying the keys in a Ruby hash. In one, you are making use of symbols; in the other, you are using strings. You can choose either of these but, for the sake of sanity, try to be consistent. There are some pitfalls in using either approach and there are some inherent benefits too. For example, symbols are immutable and are allocated just once, which is a performance gain. On the other hand, they can be pretty irritating if you are trying to include stuff such as hyphens in their names. If symbols confuse you, stick with strings or vice-versa.

Note

One of the popular lint tools called Foodcritic...

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