3. Chef and Ruby | Mastering Chef

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Mastering Chef

By : Mayank Joshi

2.5 (4)

Mastering Chef

2.5 (4)

By: Mayank Joshi

Overview of this book

If you have used Chef before and are interested in automation of infrastructure and want to develop your own tools to manage large-scale infrastructures, then this book is for you.

Preface

Preface

What this book covers

What you need for this book

Who this book is for

Conventions

Reader feedback

Customer support

Free Chapter

1. Introduction to the Chef Ecosystem

1. Introduction to the Chef Ecosystem

Different modes of running Chef

Terminology used in the world of Chef

The anatomy of a Chef run

Setting up a work environment

Summary

2. Knife and Its Associated Plugins

2. Knife and Its Associated Plugins

Introducing Knife

Summary

3. Chef and Ruby

3. Chef and Ruby

Ruby

IRB

Variables and types

Symbols

Basic operations

Conditional statements and loops

Methods

Arrays

Bang methods

Hashes

Classes and objects

Summary

4. Controlling Access to Resources

4. Controlling Access to Resources

The bootstrap process

Authentication

Authorization

Summary

5. Starting the Journey to the World of Recipes

5. Starting the Journey to the World of Recipes

Resources

Recipes

Best practices when writing recipes

Summary

6. Cookbooks and LWRPs

6. Cookbooks and LWRPs

Cookbooks

Custom resources

Summary

7. Roles and Environments

7. Roles and Environments

Managing roles

Managing environments

Setting up an environment on a node

Role and environment attributes

Environment run lists

Summary

8. Attributes and Their Uses

8. Attributes and Their Uses

Attribute naming

Different types of attributes

Different sources of attributes

Attribute precedence

Attribute whitelisting

Summary

9. Ohai and Its Plugin Ecosystem

9. Ohai and Its Plugin Ecosystem

Running the Ohai binary

Ohai plugins

Custom plugins

Summary

10. Data Bags and Templates

10. Data Bags and Templates

Data bags

Templates

Summary

11. Chef API and Search

11. Chef API and Search

Prerequisites for using Chef API

Authentication of requests

Endpoints

Search

Ridley

Summary

12. Extending Chef

12. Extending Chef

Custom Knife plugins

Custom Chef handlers

Summary

13. (Ab)Using Chef

13. (Ab)Using Chef

The dynamic server list in Capistrano using Chef

Capistrano style deployments using Chef's "deploy" resource

Extending Chef to bootstrap distributed systems

Test-driven development with Chef

Types of tests

Summary

Index

Index

Customer Reviews

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Symbols

Symbols look like variables, however, with a colon (:) prefixed. For example, :symbol_1. Symbols need not be predeclared and assigned a value. Ruby guarantees that the symbol has a particular value, no matter where it appears in a Ruby program.

Symbols are very useful because a given symbol name refers to the same object throughout a Ruby program. Two strings with the same content are two different objects; however, for a given name, there can only be one single symbol object. Let's examine the following example to illustrate this fact:

irb
2.1-head :001 > puts "string".object_id
70168328185680
 => nil
2.1-head :002 > puts "string".object_id
70168328173400
 => nil
2.1-head :003 > puts :symbol.object_id
394888
 => nil
2.1-head :004 > puts :symbol.object_id
394888
nil

As you can see, we started by creating a string object with the string value and sought its object ID using the object_id method. Next, we tried the same thing once more. In both the cases, we received...

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83

Tech Concepts

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Programming languages

73

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