Book Image

Hands-On Cloud Development with WildFly

By : Tomasz Adamski
Book Image

Hands-On Cloud Development with WildFly

By: Tomasz Adamski

Overview of this book

The book starts by introducing you to WildFly Swarm—a tool that allows you to create runnable microservices from Java EE components. You’ll learn the basics of Swarm operation—creating microservices containing only the parts of enterprise runtime needed in a specific case. Later, you’ll learn how to configure and test those services. In order to deploy our services in the cloud, we’ll use OpenShift. You’ll get to know basic information on its architecture, features, and relationship to Docker and Kubernetes. Later, you’ll learn how to deploy and configure your services to run in the OpenShift cloud. In the last part of the book, you’ll see how to make your application production-ready. You’ll find out how to configure continuous integration for your services using Jenkins, make your application resistant to network failures using Hystrix, and how to secure them using Keycloak. By the end of the book, you’ll have a functional example application and will have practical knowledge of Java EE cloud development that can be used as a reference in your other projects.
Table of Contents (14 chapters)

The OpenShift architecture

So far, we have been talking in abstract terms. In this section, we will give you an overview of the OpenShift architecture. As a result, you will gain a practical understanding of the functioning cloud PaaS infrastructure.

Let's start with a bird's-eye view architecture diagram:

The preceding diagram sketches the layers of OpenShift architecture. Docker runs on top of the operating system and provides layers of containers. Containers are lightweight, standalone, and executable pieces of software (Further reading, link 2) that can be run anywhere on the cloud. Those containers are orchestrated by Kubernetes, which provides a unified view of heterogeneous computing resources. Finally, OpenShift builds on top of Kubernetes, providing developer tools that automate most configuration tasks. If this short description sounded cryptic to you, don...