Book Image

Feature Management with LaunchDarkly

By : Michael Gillett
Book Image

Feature Management with LaunchDarkly

By: Michael Gillett

Overview of this book

Over the past few years, DevOps has become the de facto approach for designing, building, and delivering software. Feature management is now extending the DevOps methodology to allow applications to change on demand and run experiments to validate the success of new features. If you want to make feature management happen, LaunchDarkly is the tool for you. This book explains how feature management is key to building modern software systems. Starting with the basics of LaunchDarkly and configuring simple feature flags to turn features on and off, you'll learn how simple functionality can be applied in more powerful ways with percentage-based rollouts, experimentation, and switches. You'll see how feature management can change the way teams work and how large projects, including migrations, are planned. Finally, you'll discover various uses of every part of the tool to gain mastery of LaunchDarkly. This includes tips and tricks for experimentation, identifying groups and segments of users, and investigating and debugging issues with specific users and feature flag evaluations. By the end of the book, you'll have gained a comprehensive understanding of LaunchDarkly, along with knowledge of the adoption of trunk-based development workflows and methods, multi-variant testing, and managing infrastructure changes and migrations.
Table of Contents (18 chapters)
1
Section 1: The Basics
5
Section 2:Getting the Most out of Feature Management
11
Section 3: Mastering LaunchDarkly

Summary

This chapter has covered the practical ways in which you can use LaunchDarkly, both through the tool itself and how to implement the LaunchDarkly client within an application, which resulted in you setting up and configuring your first feature flag.

Initially, we looked at creating a LaunchDarkly account and how to set up the LD client through .NET code examples. This has given you the skills to do this within any framework and language, and you now have some appreciation for how simple it is to get started with LaunchDarkly.

Next, we explored the topics of projects and environments to make sure you understood these concepts and their purpose beforehand while setting up your first flag. We looked at how to do this within LaunchDarkly and from this, it should be clear to see how easy it is to create flags. With the flag set up, we added it to our example application, where we were able to return true or false to the application, depending on the state of the flag.

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