Continuous delivery doesn't stop with deployment. Modern software teams rely on an emerging set of best practices post-deployment to continuously improve their software. With this practical guide, CTOs, software architects, and senior engineering leaders will learn what these practices are and how to apply them to their existing operations. Author John Kodumal, cofounder and CTO at LaunchDarkly, provides actionable insights into setting up and maintaining a smooth operational process post-deployment. You'll learn new approaches to releasing software, controlling systems at runtime, and measuring the impact of change. Armed with this knowledge, you can easily anticipate the next planning and building phase, feeding back into the software development lifecycle. This book helps you: Understand why mature incident management processes are an essential part of the CI/CD story Use the tools and processes necessary to measure the impact of change to production systems Learn how to use canary launches and feature flags to release faster with less risk Set up effective incident management systems to reduce the impact of broken changes Explore an emerging class of techniques that extend the practice beyond deployment Use experimentation and impact analysis to continuously improve

Make code deployments completely safe and change your application in production in real time with LaunchDarkly using percentage-based rollouts, kill switches, and A/B and multi-variant testing Key Features Learn how to work with LaunchDarkly to turn features on and off within your production applications Explore the ways in which feature management can change how software is built and how teams work Master every aspect of LaunchDarkly's functionality to test in production and learn from your users Book DescriptionOver 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. What you will learn Get to grips with the basics of LaunchDarkly and feature flags Roll out a feature to a percentage or group of users Find out how to experiment with multi-variant and A/B testing Discover how to adopt a trunk-based development workflow Explore methods to manage infrastructure changes and migrations Gain an in-depth understanding of all aspects of the LaunchDarkly tool Who this book is forThis book is for developers, quality assurance engineers and DevOps engineers. This includes individuals who want to decouple the deployment of code from the release of a feature, run experiments in production, or understand how to change processes to build and deploy software. Software engineers will also benefit from learning how feature management can be used to improve products and processes. A basic understanding of software is all that you need to get started with this book as it covers the basics before moving on to more advanced topics.