Book Image

Docker Deep Dive - Second Edition

By : Nigel Poulton
5 (1)
Book Image

Docker Deep Dive - Second Edition

5 (1)
By: Nigel Poulton

Overview of this book

Most applications, even the funky cloud-native microservices ones, need high-performance, production-grade infrastructure to run on. Having impeccable knowledge of Docker will help you thrive in the modern cloud-first world. With this book, you will gain the skills you need in order to work with Docker and its containers. The book begins with an introduction to containers and explains their functionality and application in the real world. You will then get an overview of VMware, Kubernetes, and Docker and learn to install Docker on Windows, Mac, and Linux. Once you have understood the Ops and Dev perspective of Docker, you will be able to see the big picture and understand what Docker exactly does. The book then turns its attention to the more technical aspects, guiding you through practical exercises covering Docker engine, Docker images, and Docker containers. You will learn techniques for containerizing an app, deploying apps with Docker Compose, and managing cloud-native applications with Swarm. You will also build Docker networks and Docker overlay networks and handle applications that write persistent data. Finally, you will deploy apps with Docker stacks and secure your Docker environment. By the end of this book, you will be well-versed in Docker and containers and have developed the skills to create, deploy, and run applications on the cloud.
Table of Contents (2 chapters)

8: Containerizing an app

Docker is all about making it easy to take application source code and get it running in a container. This process is called containerization.

In this chapter, we’ll walk through the process of containerizing some simple Linux apps. You’ll need a Docker environment if you want to follow along. Any of the environments form the Getting Docker chapter will work.

We’ll split this chapter into the usual three parts:

  • The TLDR
  • The deep dive
  • The commands

Let’s containerize an app!

Containerizing an app - The TLDR

Containers are all about making apps simple to build, ship, and run. The end-to-end process looks like this:

  1. Start with your application code and dependencies
  2. Create a Dockerfile that describes your app, dependencies, and how to run it
  3. Build it into an image by passing the Dockerfile to the docker build command
  4. Push the new image to a registry (optional)
  5. Run a container from the image

Figure 8.1 shows the...