Preface
Imagine creating and testing Java EE applications on Apache Tomcat or Wildfly in minutes, along with deploying and managing Java applications swiftly. Sounds too good to be true? You have a reason to cheer, because such scenarios are 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 be then introduced to the concept of microservices and learn how to deploy and run Java microservices as Docker containers. Moving on, the book will focus on Kubernetes and its features. You will start by running the local cluster using Minikube. The next step will be to deploy your Java service in the real cloud, on Kubernetes running on top of Amazon AWS. At the end of the book, you will get hands-on experience of some more advanced topics to further extend your knowledge of Docker and Kubernetes.
What this book covers
Chapter 1, Introduction to Docker, introduces the reasoning behind Docker and presents the differences between Docker and traditional virtualization. The chapter also explains basic Docker concepts, such as images, containers, and Dockerfiles.
Chapter 2, Networking and Persistent Storage, explains how networking and persistent storage work in Docker containers.
Chapter 3, Working with Microservices, presents an overview of what microservices are and explains their advantages in comparison to monolithic architectures.
Chapter 4, Creating Java Microservices, explores a recipe for quickly constructing Java microservice, by utilizing either Java EE7 or the Spring Boot.
Chapter 5, Creating Images with Java Applications, teaches how to package the Java microservices into Docker images, either manually or from the Maven build file.
Chapter 6, Running Containers with Java Applications, shows how to run a containerized Java application using Docker.
Chapter 7, Introduction to Kubernetes, introduces the core concepts of Kubernetes, such as Pods, nodes, services, and deployments.
Chapter 8, Using Kubernetes with Java, shows how to deploy Java microservices, packaged as a Docker image, on the local Kubernetes cluster.
Chapter 9, Working with Kubernetes API, shows how the Kubernetes API can be used to automate the creation of Kubernetes objects such as services or deployments. This chapter gives examples of how to use the API to get information about the cluster's state.
Chapter 10, Deploying Java on Kubernetes in the Cloud, shows the reader how to configure Amazon AWS EC2 instances to make them suitable to run a Kubernetes cluster. This chapter also gives precise instructions on how to create a Kubernetes cluster on the Amazon AWS cloud.
Chapter 11, More Resources, explores how Java and Kubernetes point the reader to additional resources available on the internet that are of high quality, to further extend knowledge about Docker and Kubernetes.
What you need for this book
For this book, you will need any decent PC or Mac, capable of running a modern version of Linux, Windows 10 64-bit, or macOS.
Who this book is for
This book is for Java developers, who would like to get into the world of containerization. The reader will learn how Docker and Kubernetes can help with deployment and management of Java applications on clusters, either on their own infrastructure or in the cloud.
Conventions
In this book, you will find a number of text styles that distinguish between different kinds of information. Here are some examples of these styles and an explanation of their meaning. Code words in text, database table names, folder names, filenames, file extensions, pathnames, dummy URLs, user input, and Twitter handles are shown as follows: "The Dockerfile is used to create the image when you run the docker build command." A block of code is set as follows:
{
"apiVersion": "v1",
"kind": "Pod",
"metadata":{
"name": ”rest_service”,
"labels": {
"name": "rest_service"
}
},
"spec": {
"containers": [{
"name": "rest_service",
"image": "rest_service",
"ports": [{"containerPort": 8080}],
}]
}
}Any command-line input or output is written as follows:
docker rm $(docker ps -a -q -f status=exited)New terms and important words are shown in bold. Words that you see on the screen, for example, in menus or dialog boxes, appear in the text like this: "Clicking the Skip For Now will take you to the the images list without logging into the Docker Hub."
Note
Warnings or important notes appear in a box like this.
Note
Tips and tricks appear like this.
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Errata
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Questions
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