Book Image

Extending SaltStack

Book Image

Extending SaltStack

Overview of this book

Salt already ships with a very powerful set of tools, but that doesn't mean that they all suit your needs perfectly. By adding your own modules and enhancing existing ones, you can bring the functionality that you need to increase your productivity. Extending SaltStack follows a tutorial-based approach to explain different types of modules, from fundamentals to complete and full-functioning modules. Starting with the Loader system that drives Salt, this book will guide you through the most common types of modules. First you will learn how to write execution modules. Then you will extend the configuration using the grain, pillar, and SDB modules. Next up will be state modules and then the renderers that can be used with them. This will be followed with returner and output modules, which increase your options to manage return data. After that, there will be modules for external file servers, clouds, beacons, and finally external authentication and wheel modules to manage the master. With this guide in hand, you will be prepared to create, troubleshoot, and manage the most common types of Salt modules and take your infrastructure to new heights!
Table of Contents (21 chapters)
Extending SaltStack
About the Author
About the Reviewer

Chapter 6. Handling Return Data

When the Salt Master issues a command to a Minion and the task completes successfully, there will always be return data. The salt command normally listens for return data, and if it is sent back in time, it will be displayed using an outputter. But whether or not that happens, the Minion will always send return data back to the Master, and any other destinations configured as returners.

This chapter is all about handling that return data, using both returner and outputter modules. We'll talk about:

  • How data is returned to the Master

  • Writing returner modules

  • Extending returners to be used as external job caches

  • Troubleshooting returners

  • Writing outputter modules

  • Troubleshooting outputters