Book Image

Mastering SaltStack - Second Edition

Book Image

Mastering SaltStack - Second Edition

Overview of this book

SaltStack is a powerful configuration management and automation suite designed to manage servers and tens of thousands of nodes. This book showcases Salt as a very powerful automation framework. We will review the fundamental concepts to get you in the right frame of mind, and then explore Salt in much greater depth. You will explore Salt SSH as a powerful tool and take Salt Cloud to the next level. Next, you’ll master using Salt services with ease in your infrastructure. You will discover methods and strategies to scale your infrastructure properly. You will also learn how to use Salt as a powerful monitoring tool. By the end of this book, you will have learned troubleshooting tips and best practices to make the entire process of using Salt pain-free and easy.
Table of Contents (20 chapters)
Mastering SaltStack Second Edition
Credits
Foreword
About the Author
About the Reviewer
www.PacktPub.com
Preface

Using aggregate data with Thorium


Because Thorium can store data in its register, you can keep track of a certain amount of aggregate data and perform operations based on it. Let's take a look at a classic example: load average. We'll use the load beacon to keep track of load on a minion and fire events when it falls outside the bounds configured for it. Then we'll have Thorium perform calculations and react when another threshold is reached.

First, we need to set up the load beacon. Let's go ahead and use the configuration that we looked at earlier in the chapter, with one addition. Add the following configuration to your minion file:

beacons: 
  load: 
    - 1m: 
      - 0.0 
      - 2.0 
    - interval: 30 
    - onchangeonly: True 

Setting onchangeonly to True will tell the beacon not to fire any events unless the thresholds that we have configured have been passed. This will cut down on the amount of traffic that is sent to the master.

Then we'll set up a Thorium SLS file to take a look...