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)
1
Section 1: Docker and Container Fundamentals
5
Section 2: Creating Kubernetes Development Clusters, Understanding objects, and Exposing Services
9
Section 3: Running Kubernetes in the Enterprise

Docker tmpfs mounts

At the beginning of this chapter, we mentioned that Docker allows you to use the host's RAM as a temporary storage location for container data. This type of mount will not persist data but for the right workload, it can be a very useful storage location. tmpfs offers a few unique advantages that are not available in volumes or bind mounts:

  • The size can be pre-defined to limit the amount of RAM that is consumed for storage.
  • Offers very fast data access.

There are also some limitations to tmpfs mounts:

  • They are only available on Linux; Windows is not supported.
  • A single tmpfs can only be mounted to one container.

Using a tmpfs mount in a container

A container can be started with a tmpfs mount by adding either --mount or using the --tmpfs option. In general, you should use the --mount option by default since --tmpfs does not allow for any customizations on the mount. If you use --tmpfs, you will not be able to set a size...