John Clingan - Kubernetes Native Microservices with Quarkus and MicroProfile

Bank application architecture overview

with Quarkus and MicroProfile

John Clingan and Ken Finnigan

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ISBN: 9781617298653

We, the authors, have been involved in the Enterprise Java industry for more than a decade. We started working together at Red Hat in 2016, during the founding of MicroProfile to create Java microservices specifications, and with WildFly Swarm, now called Thorntail, as a runtime to implement those specifications.

Since then, Kubernetes has continued to grow as a container orchestration platform. Given Red Hats integral involvement with Kubernetes and OpenShiftits enterprise distributionour job was to facilitate Thorntail deployments on Kubernetes. We also worked with the MicroProfile community, who also recognized the growth of Kubernetes, to evolve its specifications to add support for Java microservices deployments on Kubernetes.

We also recognized the limitations of Java and runtimes like Thorntail deployed to Kubernetes, consuming hundreds of megabytes of RAM for each microservice instance. Resource utilization can put Java at a considerable disadvantage, compared with other runtimes like Node.js or Golang, for shared deployment environments like Kubernetes clusters. To address this, Red Hat introduced Supersonic Subatomic Javain other words, Quarkus!

Quarkus is a unique runtime. It supports MicroProfile and other industry-leading specifications and frameworks, helping developers become productive quickly. Kubernetes is a first-class deployment platform for Quarkus, with built-in tooling that reduces native compilation and Kubernetes deployment to a single command. We have to say that working together with a couple of dozen other Red Hat employees crammed into a conference room in Neuchtel, Switzerland, on Quarkuss launch day was one of the most memorable and rewarding days of our professional careers.

We recognize that plenty of books are available for MicroProfile, Kubernetes, and, more recently, Quarkus. We set out to write a book that reflects how the three used together are greater than the sum of their parts. Deploying to Kubernetes is not an afterthought; it is integral to each chapter. We wanted to go beyond developing an application locally by deploying it (implemented as a collection of microservices) to Kubernetes as it evolves throughout the book. We wanted to show how MicroProfile-based APIs interoperate with backend services while running in a Kubernetes cluster, like Prometheus and Grafana, Jaeger, and Kafka. We wanted a balance between demonstrating the step-by-step Quarkus live coding iterative development style with MicroProfile and Quarkus APIs like JUnit 5 and WireMock for automated testing of MicroProfile applications.

The challenge is to bring microservices development with Quarkus, MicroProfile, and Kubernetes together in a single book and make it feel like the natural experience it truly is. Hopefully, we have met this challenge, and you learn as much from reading this book as we did in writing it. Happy reading (and coding)!

We would like to thank Elesha Hyde, our development editor, for being so understanding of our delays in finishing the writing. In addition, wed like to thank all the reviewers: Alain Lompo, Alessandro Campeis, Andres Sacco, Asif Iqbal, Daniel Corts, David Torrubia Iigo, DeUndre Rushon, John Guthrie, Kent R. Spillner, Krzysztof Kamyczek, Micha Ambroziewicz, Mladen Kneic, Ramakrishna Chintalapati, Sergio Britos, and Yogesh Shetty. Their suggestions helped make this a better book.

Also, a thank-you goes to the entire Manning team for all their efforts on the project: Raphael Villela, technical development editor; Aleksander Dragosavljevi, review editor; Keri Hales, production editor; Pamela Hunt, copyeditor; Mladen Knei, technical proofreader; Katie Tennant, proofreader; as well as the rest of the production team. Its been greatly appreciated, and the book wouldnt be here today without them.

John Clingan: Id like to thank my wife, Tran, and daughters, Sarah and Hailey, who had a part-time spouse and father, respectively, while working on this book in the home office, car, and hotel during many weekend soccer tournaments. I also thank my coauthor, Ken, as an experienced author and friend, for his patience and guidance while authoring my first book.

Ken Finnigan: I will be forever indebted to Erin, my wife, for her continued understanding and support throughout the process. I would also like to thank my sons, Lorcn and Daire, for understanding their dad disappearing to work on the book in the evenings or weekends.

Over the last couple of years, Quarkus has exploded in popularity as a framework for developing microservices, and Eclipse MicroProfile is continuing to grow as a set of APIs for developing microservices with Java. This book details how to create, build, debug, and deploy Quarkus microservices with MicroProfile and Spring APIs to Kubernetes.