Book Image

Kubernetes and Docker - An Enterprise Guide

By : Scott Surovich, Marc Boorshtein
Book Image

Kubernetes and Docker - An Enterprise Guide

By: Scott Surovich, Marc Boorshtein

Overview of this book

Containerization has changed the DevOps game completely, with Docker and Kubernetes playing important roles in altering the flow of app creation and deployment. This book will help you acquire the knowledge and tools required to integrate Kubernetes clusters in an enterprise environment. The book begins by introducing you to Docker and Kubernetes fundamentals, including a review of basic Kubernetes objects. You’ll then get to grips with containerization and understand its core functionalities, including how to create ephemeral multinode clusters using kind. As you make progress, you’ll learn about cluster architecture, Kubernetes cluster deployment, and cluster management, and get started with application deployment. Moving on, you’ll find out how to integrate your container to a cloud platform and integrate tools including MetalLB, externalDNS, OpenID connect (OIDC), pod security policies (PSPs), Open Policy Agent (OPA), Falco, and Velero. Finally, you will discover how to deploy an entire platform to the cloud using continuous integration and continuous delivery (CI/CD). By the end of this Kubernetes book, you will have learned how to create development clusters for testing applications and Kubernetes components, and be able to secure and audit a cluster by implementing various open-source solutions including OpenUnison, OPA, Falco, Kibana, and Velero.
Table of Contents (20 chapters)
Section 1: Docker and Container Fundamentals
Section 2: Creating Kubernetes Development Clusters, Understanding objects, and Exposing Services
Section 3: Running Kubernetes in the Enterprise

Implementing namespace multi-tenancy

Clusters deployed for multiple stakeholders, or tenants, should be divided up by namespace. This is the boundary that was designed into Kubernetes from the very beginning. When deploying namespaces, there are generally two ClusterRoles that are assigned to users in the namespace:

  • admin: This aggregated ClusterRole provides access to every verb and nearly every resource that ships with Kubernetes, making the admin user the ruler of their namespace. The exception to this is any namespace-scoped object that could affect the entire cluster, such as ResourceQuotas.
  • edit: Similar to admin, but without the ability to create RBAC Roles or RoleBindings.

It's important to note that the admin ClusterRole can't make changes to the namespace object by itself. Namespaces are cluster-wide resources, so they can only be assigned permissions via a ClusterRoleBinding.

Depending on your strategy for multi-tenancy, the admin ClusterRole...