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Mastering SaltStack

You're reading from   Mastering SaltStack Use Salt to the fullest

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Product type Paperback
Published in Nov 2016
Publisher Packt
ISBN-13 9781786467393
Length 378 pages
Edition 2nd Edition
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Author (1):
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Joseph Hall Joseph Hall
Author Profile Icon Joseph Hall
Joseph Hall
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Table of Contents (14) Chapters Close

Preface 1. Essentials Revisited FREE CHAPTER 2. Diving into Salt Internals 3. Managing States 4. Exploring Salt SSH 5. Managing Tasks Asynchronously 6. Taking Advantage of Salt Information Systems 7. Taking Salt Cloud to the Next Level 8. Using Salt with REST 9. Understanding the RAET and TCP Transports 10. Strategies for Scaling 11. Monitoring with Salt 12. Exploring Best Practices 13. Troubleshooting Problems

Templates and variables

When we're talking about the balance between generic and explicit, we'd better talk about variable names. A good variable name will also strike this balance and become an emulsifier between the minion and the state tree.

Nested variables

Salt allows hierarchical data structures to be used in order to define variables. In a way, this allows variables to behave like directories, in which these structures may be either shallow or deep.

However, unlike directory structures, searching through deep variable structures is not necessarily as painful. When you use flat files to define a structure, it may actually be easier to read a structure that is deeply nested. Let's turn the ingredients for a chocolate chip cookie recipe into a set of Salt grains, as follows:

cookies: 
  fats: 
    - butter 
  sugars: 
    - granulated sugar 
    - light brown sugar 
  wet_ingredients: 
    - eggs 
    - vanilla extract 
  dry_ingredients: 
    - flour 
    - baking soda ...
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