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

Deploying Kubernetes using K3s

The final tool we are going to take a look at is K3s from Rancher. Like MicroK8s, K3s is a lightweight Kubernetes distribution designed for edge and IoT devices. This again makes it perfect for local development too as K3s is also a certified Kubernetes distribution – as is Docker, Kind, and MicroK8s.

Important note

You may be wondering why on earth it is called K3s. There is some logic behind it. As Rancher's main design aim for K3s was to produce something with half of the memory footprint of a typical Kubernetes distribution, they decided that as Kubernetes is a 10-letter word but is stylized as K8s, then their distribution would be half the size – 5 letters – and would, therefore, be stylized as K3s. However, there is no long-form for K3s and nor is there an official pronunciation.

Finally, K3s supports multi-node clusters, so we are going to look at building a three-node cluster. The commands we'll be using...