Book Image

Docker Deep Dive

By : Nigel Poulton
Book Image

Docker Deep Dive

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 to thrive in the modern cloud-first world. With this book, you’ll gain the skills you need to work with Docker and its containers. The book begins with an introduction to containers and explains its functionality and application in the real world. You’ll then get an overview of VMware, Kubernetes, and Docker and learn to install Docker on Windows, Mac, and Linux. Once you’ve understood the Ops and Dev perspective of Docker, you’ll 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 your through practical exercises covering Docker engine, Docker images, and Docker containers. You’ll learn techniques for containerizing an app, deploying apps with Docker Compose, and managing cloud-native applications with Swarm. You’ll also build Docker networks and Docker overlay networks and handle applications that write persistent data. Finally, you’ll deploy apps with Docker stacks and secure your Docker environment. By the end of this book, you’ll be well-versed in Docker and containers and have developed the skills to create, deploy, and run applications on the cloud.
Table of Contents (3 chapters)

8: Containerizing an app

Docker is all about taking applications and running them in containers.

The process of taking an application and configuring it to run as a container is called “containerizing”.

In this chapter, we’ll walk through the process of containerizing a simple Linux-based web application. If you don’t have a Linux Docker environment to follow along with, you can use Play With Docker for free. Just point your web browser to and spin up some Linux Docker nodes. It’s my favourite way to spin up Docker and do testing!

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 process of containerizing an app looks like this:

  1. Start with your application code and dependencies
  2. Create a Dockerfile that describes your...