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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

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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