May 2024
Intermediate to advanced
366 pages
7h 58m
English
Content preview from Certified Kubernetes Application Developer (CKAD) Study Guide, 2nd Edition
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Chapter 4. Containers
Kubernetes is a container orchestrator that uses a container runtime to instantiate containers inside of Pods. Many Kubernetes clusters with version 1.24 or later use the container runtime containerd.
Container runtime used on a Kubernetes node
You can fetch information about the container runtime used on any node of a Kubernetes cluster. Simply look at the output of the CONTAINER-RUNTIME column produced by running the command kubectl get nodes -o wide. Check the Kubernetes documentation to learn more about configuring a container runtime for a
cluster.
For the exam, you are expected to understand the practical aspects of defining, building, and publishing container images, which this chapter covers. We’ll also touch on running a container image inside of a container. For all of those operations, we’ll use Docker Engine as the example container runtime though similar functionality is provided by other implementations.
The discussion on containers in this book only scratches the surface. There’s a lot more information on this topic if you want to fully immerse yourself. I can recommend the book Docker: Up & Running (O’Reilly) by Sean P. Kane and Karl Matthias for a detailed explanation of Docker.
Container Terminology
A container packages an application into a single unit of software including its runtime environment ...
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I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
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I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.