Book Image

Mastering Docker - Third Edition

By : Russ McKendrick, Scott Gallagher
Book Image

Mastering Docker - Third Edition

By: Russ McKendrick, Scott Gallagher

Overview of this book

Docker has been a game-changer when it comes to how modern applications are deployed and created. It has now grown into a key driver of innovation beyond system administration, with an impact on the world of web development. But how can you make sure you're keeping up with the innovations it's driving, or be sure you're using it to its full potential? Mastering Docker shows you how; this book not only demonstrates how to use Docker more effectively, but also helps you rethink and reimagine what's possible with it. You will cover concepts such as building, managing, and storing images, along with best practices to make you confident, before delving more into Docker security. You'll find everything related to extending and integrating Docker in new and innovative ways. Docker Compose, Docker Swarm, and Kubernetes will help you take control of your containers in an efficient manner. By the end of the book, you will have a broad, yet detailed, sense of what's possible with Docker, and how seamlessly it fits in with a range of other platforms and tools.
Table of Contents (17 chapters)

Container considerations

When Docker was first released, there was a lot of talk about Docker versus virtual machines. I remember reading articles in magazines, commenting on threads on Reddit, and reading endless blog posts. In the early days of the Docker alpha and beta versions, people used to approach Docker containers like virtual machines, because there weren't really any other points of reference, and we viewed them as tiny VMs.

In the past, I would enable SSH, run multiple processes in containers, and even create my container images by launching a container and running the commands to install my software stack. This is something that we discussed in Chapter 2, Building Container Images; you should never do it, as it is considered a bad practice.

So, rather than discussing containers versus virtual machines, let's look at some of the considerations that you need...