Book Image

Cloud-Native Applications in Java

By : Andreas Olsson, Ajay Mahajan, Munish Kumar Gupta, Shyam Sundar S
Book Image

Cloud-Native Applications in Java

By: Andreas Olsson, Ajay Mahajan, Munish Kumar Gupta, Shyam Sundar S

Overview of this book

Businesses today are evolving so rapidly that they are resorting to the elasticity of the cloud to provide a platform to build and deploy their highly scalable applications. This means developers now are faced with the challenge of building build applications that are native to the cloud. For this, they need to be aware of the environment, tools, and resources they’re coding against. If you’re a Java developer who wants to build secure, resilient, robust, and scalable applications that are targeted for cloud-based deployment, this is the book for you. It will be your one stop guide to building cloud-native applications in Java Spring that are hosted in On-prem or cloud providers - AWS and Azure The book begins by explaining the driving factors for cloud adoption and shows you how cloud deployment is different from regular application deployment on a standard data centre. You will learn about design patterns specific to applications running in the cloud and find out how you can build a microservice in Java Spring using REST APIs You will then take a deep dive into the lifecycle of building, testing, and deploying applications with maximum automation to reduce the deployment cycle time. Gradually, you will move on to configuring the AWS and Azure platforms and working with their APIs to deploy your application. Finally, you’ll take a look at API design concerns and their best practices. You’ll also learn how to migrate an existing monolithic application into distributed cloud native applications. By the end, you will understand how to build and monitor a scalable, resilient, and robust cloud native application that is always available and fault tolerant.
Table of Contents (20 chapters)
Title Page
Dedication
Packt Upsell
Foreword
Contributors
Preface
Index

Kubernetes – container orchestration


So far, we have been individually deploying the services such as Eureka, the config server, the product service, and Zuul.

Recollecting from the previous chapter, we can automate their deployment through CI, such as Jenkins. We also saw how the deployment could be done with Docker containers.

However, during runtime, the containers still run independently of each other. There is no mechanism to scale the containers, or to restart them if one has failed. Also, the decision on which service to deploy on which VM is manual, which means that the services always get deployed onto the static VMs that are designated for the services to run, instead of being mixed and matched intelligently. In short, the orchestration layer managing our application services is missing.

Kubernetes is a popular orchestration mechanism that makes deployment and runtime management an easier task.

Kubernetes architecture and services

Kubernetes is an open source project spearheaded by...