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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

Looking at asynchronous programming


Considering that asynchronous is in RAET's name itself, it should come as no surprise that RAET is a type of asynchronous protocol. TCP is not an asynchronous protocol by nature, but it can be used for asynchronous tasks. UDP isn't exactly asynchronous either; it uses more of a "fire and forget" methodology.

So what is asynchronous programming? First of all, let's examine what synchronous programming is. Classical programming is synchronous by its very nature. A program issues a command and then waits for it to complete before issuing the next command.

In terms of more complex software, a program will start with a series of commands, which will usually end up calling subroutines or functions, which themselves may call more subroutines and functions. Each time a piece of code calls another piece of code, it must wait until that code completes before moving onto its next step.

This kind of code is limited by blocking. This means that if you have a number of...

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