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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Basic operations

Like all other programming languages, Ruby comes packed with a whole bunch of operators.

Arithmetic operators

Assume a = 2 and b = 4.

Operator	Description	Example
+	Addition: Adds values on either side of the operator	a + b will give 6
-	Subtraction: Subtracts the right-hand side operand from the left-hand side operand	a – b will give -2
*	Multiplication: Multiplies values on either side of the operator	a * b will give 8
/	Division: Divides the left-hand side operand by the right-hand side operand	b / a will give 2
%	Modulus: Divides the left-hand side operand by the right-hand side operand and returns the remainder	b % a will give 0
**	Exponent: Performs exponential (power) calculations on operators	a ** b will give 2 to the power of 4, which is 16

Comparison operators

Operator	Description	Example
==	Checks whether the values of the two operands are equal or not; if yes, then the condition becomes true.	(a == b) is not true.
!=	Checks whether the...

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83

Tech Concepts

36

Programming languages

73

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