1. Kubernetes(k8s) Materials
Here are some commonly available documents.
Some of the books currently available do not differ much from the Japanese translations on the official website, so please try to learn online first.
However, for advanced use, such as extending the functionality of Kubernetes itself using Kubebuilder or other tools, commercially available books will be useful.
There are also some that cover older versions. If what is written does not work, please check the target Kubernetes version.
1.1. Kubernetes.io Official Website
This is useful for confirming accurate information.
The number of articles in Japanese has been increasing recently, but the Japanese descriptions may be outdated, so please compare them with the English version as appropriate.
1.2. [Gigazine Article] Easy-to-Understand Explanation of Containers, Docker, and Kubernetes for Beginners
Original version is here: What Are Software Containers?
1.3. [YouTube] List of Kubernetes-Related Videos Published by IBM
This is a list of Kubernetes-related videos published by IBM.
1.4. [Blog] Google Cloud Behind the Pokémon GO Explosion
This is an article published on the Google Cloud Platform (GCP) Japanese blog. It is not about learning how to use Kubernetes, but it is interesting as a concrete use case.
Original version is here: Bringing Pokémon GO to life on Google Cloud
1.5. [Article Summary] Why Do We Need Kubernetes?
This is a summary of articles on Impress’s ThinkIT site. The first article does a good job of explaining why Kubernetes is getting so much attention.
1.6. IBM Developer
IBM Developer had articles for developers.
Nowadays, the Japanese articles are archived on GitHub, though the articles are not updated. It is a good reference for learning about various case studies in companies.