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

Working with autoscale reactors


Some cloud providers are able to actively send updates to automated systems, such as Salt, which Salt Cloud can act on, but even if they don't, Salt Cloud is able to poll cloud providers for the information it needs and use that information when the cloud provider automatically scales your infrastructure for you.

Cloud cache

There are in fact two caches kept by Salt Cloud, but one is more of an index than anything. Both are kept in the cloud/ directory inside Salt's own cache directory. The normal location for the cloud cache is /var/cache/salt/cloud/.

If you've used Salt Cloud to create a compute instance, then there will be a file in this directory called index.p. This file, which is in the msgpack format, contains a list of all the compute instances that have been created by Salt Cloud (minus any that have been subsequently destroyed by Salt Cloud). There is no configuration variable to turn this on or off; it will be generated automatically.

If you were to...