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

Scope of API Resources

All resource types can either be cluster-scoped resources or namespace-scoped resources. The scope of a resource affects the access of that resource and how that resource is managed. Let's look at the differences between namespace and cluster scope.

Namespace-Scoped Resources

As we saw in Chapter 2, An Overview of Kubernetes, Kubernetes makes use of Linux namespaces to organize most Kubernetes resources. Resources in the same namespace share the same control access policies and authorization checks. When a namespace is deleted, all resources in that namespace are also deleted.

Let's see what forms the request paths for interacting with namespace-scoped resources take:

  • Return the information about a specific pod in a namespace:
    GET /api/v1/namespaces/{my-namespace}/pods/{pod-name}
  • Return the information about a collection of all Deployments in a namespace:
    GET /apis/apps/v1/namespaces/{my-namespace}/deployments
  • Return the information...