Book Image

Mastering Docker, Fourth Edition - Fourth Edition

Book Image

Mastering Docker, Fourth Edition - Fourth Edition

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 a significant impact on the world of web development. Mastering Docker shows you how you can ensure that you're keeping up with the innovations it's driving and be sure you're using it to its full potential. This fourth edition not only demonstrates how to use Docker more effectively but also helps you rethink and reimagine what you can achieve with it. You'll start by building, managing, and storing images along with exploring best practices for working with Docker confidently. Once you've got to grips with Docker security, the book covers essential concepts for extending and integrating Docker in new and innovative ways. You'll also learn how to take control of your containers efficiently using Docker Compose, Docker Swarm, and Kubernetes. By the end of this Docker book, you’ll 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 (22 chapters)
1
Section 1: Getting Up and Running with Docker
8
Section 2: Clusters and Clouds
16
Section 3: Best Practices

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. We discussed in Chapter 2, Building Container Images, that you should never install, configure, and export SSH on your containers as it is regarded as a bad practice as Docker provides ways for you to access your containers without having to use SSH.

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