Book Image

The Kubernetes Workshop

By : Zachary Arnold, Sahil Dua, Wei Huang, Faisal Masood, Mélony Qin, Mohammed Abu Taleb
Book Image

The Kubernetes Workshop

By: Zachary Arnold, Sahil Dua, Wei Huang, Faisal Masood, Mélony Qin, Mohammed Abu Taleb

Overview of this book

Thanks to its extensive support for managing hundreds of containers that run cloud-native applications, Kubernetes is the most popular open source container orchestration platform that makes cluster management easy. This workshop adopts a practical approach to get you acquainted with the Kubernetes environment and its applications. Starting with an introduction to the fundamentals of Kubernetes, you’ll install and set up your Kubernetes environment. You’ll understand how to write YAML files and deploy your first simple web application container using Pod. You’ll then assign human-friendly names to Pods, explore various Kubernetes entities and functions, and discover when to use them. As you work through the chapters, this Kubernetes book will show you how you can make full-scale use of Kubernetes by applying a variety of techniques for designing components and deploying clusters. You’ll also get to grips with security policies for limiting access to certain functions inside the cluster. Toward the end of the book, you’ll get a rundown of Kubernetes advanced features for building your own controller and upgrading to a Kubernetes cluster without downtime. By the end of this workshop, you’ll be able to manage containers and run cloud-based applications efficiently using Kubernetes.
Table of Contents (20 chapters)
Preface

API Groups

An API group is a collection of resources that are logically related to each other. For example, Deployments, ReplicaSets, and DaemonSets all belong to the apps API group: apps/v1.

Note

You will learn about Deployments, ReplicaSets, and DaemonSets in detail in Chapter 7, Kubernetes Controllers. In fact, this chapter will talk about many API resources that you will encounter in later chapters.

The --api-group flag can be used to scope the output to a specific API group, as we will see in the following sections. Let's take a closer look at the various API groups in the following sections.

Core Group

This is also called the legacy group. It contains objects such as pods, services, nodes, and namespaces. The URL path for these is /api/v1, and nothing other than the version is specified in the apiVersion field. For example, consider the following screenshot where we are getting information about a pod:

Figure 4.25: API group of a pod...