Docker has got a lot of attention in the last few years. Today it has thousands of community contributors, countless numbers of containers downloads, and more and more third party projects using it. It seems that its acclaim will grow even more in the next few years. In this book, we will try to explain this extraordinary popularity and show how you can benefit from faster and simpler application development, testing, and deployment. We will learn Docker from a developer’s perspective mostly and focus on creating, running, and publishing Docker images, rather than managing and clustering them. We will begin with the basic ideas and advantages which Docker brings to the developer’s tool set.
Chapter 1, Introduction to Docker, briefly describes what Docker is and how it can be useful in modern software development and deployment. We will point out what advantages come with the tool and why it is helpful. This chapter will also demonstrate how the containers containing code, runtime, system tools, and libraries can speed up the development and deployment, at the same time making it a more enjoyable experience.
Chapter 2, Installing Docker, contains the brief description of the available tools, such as Docker CLI or Kinematic (Docker GUI). Next, we will go straight to the action--installing the tools. The chapter will give precise and practical instructions on how to install the Docker Toolbox on Mac, Linux, and Windows. The chapter will also describe the process of installing Docker in the cloud, such as Amazon AWS.
Chapter 3, Understanding Images and Containers, talks about the Docker’s architecture. We will explain the terminology related to working with it. After reading this chapter you will understand the concepts and architecture behind Docker; it is a must when going through the next chapters.
Chapter 4, Networking and Persistent Storage, describes the Dockers networking and storage concepts. The chapter will introduce the reader to containers networking and present different kind of containers (open, closed, bridged and joined). The reader will also get familiar with the idea of volumes and their types. Additionally, the reader will learn how to manage, mount, and share Docker volumes.
Chapter 5, Finding Images, describes the process of identifying software, finding and installing it with the Docker Hub, and the alternative sources. After reading this chapter, the reader will be able to find a specified image in the Docker repository and then install it.
Chapter 6, Creating Images, tells the reader how to write a Dockerfile, how to build an image from it, and get familiar with the image build process. The chapter will contain the best practices for writing Dockerfiles and useful tips and tricks for dealing with the images.
Chapter 7, Running Containers, tells us how to run programs within containers. The chapter will describe the concept of starting, stopping, restarting, listing, and viewing the container output. The reader will run multiple programs in a container and get familiar with injecting the configuration into the container. We will also describe the container life cycle and the cleanup process.
Chapter 8, Publishing Images, familiarizes us with the process of packaging software for distribution. After reading this chapter, the reader will be able to create a Docker Hub account & repository. Then, he will push his image up to it so other people with Docker Engine can run it. The chapter will also describe the process of private software distribution. At the end of the chapter, the reader will pull his own image from the repository to test the process.
Chapter 9 , Using Docker in Development, discusses how to incorporate building Docker images into the Maven build process. To do that, we will utilize docker-maven plugins. We will also package a Java web application running on Spring Boot embedded server. To demonstrate the process of packaging a static web application into Docker container we will also run angular.js application with node.js backend from inside the Docker container.
Appendix A, More resources, directs you to some more useful resources for further reading, such as forums, blogs, and websites related to Docker. The chapter will also mention some useful third party tools related to Docker and show how they can be useful when working with Docker.
You will need a Mac or PC, running OS X, MS Windows or Linux to be able to setup and run Docker. You can download Docker for free. You can read how to get and install it in Chapter 2, Installing Docker.
This book is aimed at being a fast-paced and practical guide to get you up and running with Docker. It targets developers, IT professionals, DevOps, or anyone looking to quickly develop and deploy software to production at scale. If you are interested in Docker, DevOps, or containers in general, don’t look any further.
You will start with installing Docker and start working with images and containers. We will present different types of containers, their applications and show how to find and build images. This will allow you to familiarize with the image building process and you will be able to successfully run your programs within containers. By finishing this book, you will be well equipped in deploying your applications using Docker and will have a clear understanding of concepts, techniques, and practical methods to get it running in production systems.
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: "Mount the downloaded WebStorm-10*.dmg disk image file as another disk in your system."
A block of code is set as follows:
html, body, #map {
height: 100%;
margin: 0;
padding: 0
}Any command-line input or output is written as follows:
$ mkdir css $ cd css
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: "The shortcuts in this book are based on the Mac OS X 10.5+ scheme."
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