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Mastering SaltStack

You're reading from   Mastering SaltStack Take charge of SaltStack to automate and configure enterprise-grade environments

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Product type Paperback
Published in Aug 2015
Publisher
ISBN-13 9781785282164
Length 306 pages
Edition 1st 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 (13) Chapters Close

Preface 1. Reviewing a Few Essentials 2. Diving into Salt Internals FREE CHAPTER 3. Exploring Salt SSH 4. Managing Tasks Asynchronously 5. Taking Salt Cloud to the Next Level 6. Using Salt with REST 7. Understanding the RAET Protocol 8. Strategies for Scaling 9. Monitoring with Salt 10. Exploring Best Practices 11. Troubleshooting Problems Index

Looking at the event system

The event system is one of the oldest components of Salt. Yet, it is now used more than almost any other part. Most of its usage is internal to Salt, but don't worry, because there's plenty of functionalities that we can take advantage of as users and administrators.

Reviewing the basics

Salt is built based on a message queue. Commands that are issued from the Master generate jobs, which are posted to the queue. Minions watch the queue for anything that targets them. When a Minion picks up a job, it attempts to perform the work associated with it. Once it has finished, it posts the return data back to another queue; this is the one that the Master listens to.

Minions also have the ability to fire information, which is not associated with a job that was generated on the Master. These pieces of information form the basis of the event bus.

There are in fact two event buses: one for Minions to communicate with themselves (but not with other Minions) and one...

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