Book Image

Docker and Kubernetes for Java Developers

By : Jarosław Krochmalski
Book Image

Docker and Kubernetes for Java Developers

By: Jarosław Krochmalski

Overview of this book

Imagine creating and testing Java EE applications on Apache Tomcat Server or Wildfly Application server in minutes along with deploying and managing Java applications swiftly. Sounds too good to be true? But you have a reason to cheer as such scenarios are only possible by leveraging Docker and Kubernetes. This book will start by introducing Docker and delve deep into its networking and persistent storage concepts. You will then proceed to learn how to refactor monolith application into separate services by building an application and then packaging it into Docker containers. Next, you will create an image containing Java Enterprise Application and later run it using Docker. Moving on, the book will focus on Kubernetes and its features and you will learn to deploy a Java application to Kubernetes using Maven and monitor a Java application in production. By the end of the book, you will get hands-on with some more advanced topics to further extend your knowledge about Docker and Kubernetes.

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Table of Contents (12 chapters)
Preface
Preface
What this book covers
What you need for this book
Who this book is for
Conventions
Reader feedback
Customer support
Free Chapter
1
Introduction to Docker
Introduction to Docker
The idea behind Docker
Virtualization and containerization compared
Docker concepts - images and containers
Additional tools
Installing Docker
Summary
2
Networking and Persistent Storage
Networking and Persistent Storage
Networking
Networking commands
Creating and inspecting a network
Connecting a container to the network
Exposing ports and mapping ports
Persistent storage
Volume-related commands
Creating a volume
Removing a volume
Volume drivers
Summary
3
Working with Microservices
Working with Microservices
An introduction to microservices
Monolithic versus microservices
Maintaining data consistency
The Docker role
Kubernetes' role
When to use the microservice architecture
Summary
4
Creating Java Microservices
Creating Java Microservices
Introduction to REST
REST in Java
Coding the Spring Boot microservice
Running the application
Making calls
Spring Initializr
Summary
5
Creating Images with Java Applications
Creating Images with Java Applications
Dockerfile
Dockerfile instructions
Summary
6
Running Containers with Java Applications
Running Containers with Java Applications
Starting and stopping containers
Container running modes
Monitoring containers
Restart policies
Runtime constraints on resources
Running with Maven
Summary
7
Introduction to Kubernetes
Introduction to Kubernetes
Why do we need Kubernetes?
Basic Kubernetes concepts
Summary
8
Using Kubernetes with Java
Using Kubernetes with Java
Installing Minikube
Installing kubectl
Deploying on the Kubernetes cluster
Minikube addons
Cleaning up
Summary
9
Working with the Kubernetes API
Working with the Kubernetes API
API versioning
Authentication
Authorization
Admission control
Using the API
Swagger docs
Summary
10
Deploying Java on Kubernetes in the Cloud
Deploying Java on Kubernetes in the Cloud
Benefits of using the cloud, Docker, and Kubernetes
Installing the tools
Configuring Amazon AWS
Creating an administrative user
Creating the cluster
Summary
11
More Resources
More Resources
Docker
Kubernetes

Working with Microservices

After reading the previous two chapters, you should now have an understanding of the Docker architecture and its concepts. Before we go further on our Java, Docker, and Kubernetes journey, let's get to know the concept of microservices.

By reading this chapter, you will find out why a transition to microservices and cloud development is necessary and why monolithic architecture is not an option anymore. The microservices architecture is also where Docker and Kubernetes will be especially useful.

This chapter will cover the following topics:

  • An introduction to microservices and comparison to a monolithic architecture
  • How Docker and Kubernetes fits into the microservices world
  • When to use microservices architecture

Before we actually create the Java microservice and deploy it using Docker and Kubernetes, let's start with an explanation of the...

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