Book Image

The DevOps 2.3 Toolkit

By : Viktor Farcic
Book Image

The DevOps 2.3 Toolkit

By: Viktor Farcic

Overview of this book

Building on The DevOps 2.0 Toolkit, The DevOps 2.1 Toolkit: Docker Swarm, and The DevOps 2.2 Toolkit: Self-Sufficient Docker Clusters, Viktor Farcic brings his latest exploration of the DevOps Toolkit as he takes you on a journey to explore the features of Kubernetes. The DevOps 2.3 Toolkit: Kubernetes is a book in the series that helps you build a full DevOps Toolkit. This book in the series looks at Kubernetes, the tool designed to, among other roles, make it easier in the creation and deployment of highly available and fault-tolerant applications at scale, with zero downtime. Within this book, Viktor will cover a wide range of emerging topics, including what exactly Kubernetes is, how to use both first and third-party add-ons for projects, and how to get the skills to be able to call yourself a “Kubernetes ninja.” Work with Viktor and dive into the creation and exploration of Kubernetes with a series of hands-on guides.
Table of Contents (18 chapters)
16
The End
17
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Accessing host's resources through hostPath volumes

Sooner or later, we'll have to build our images. A simple solution would be to execute the docker image build command directly from a server. However, that might cause problems. Building images on a single host means that there is an uneven resource utilization and that there is a single point of failure. Wouldn't it be better if we could build images anywhere inside a Kubernetes cluster?

Instead of executing the docker image build command, we could create a Pod based on the docker image. Kubernetes will make sure that the Pod is scheduled somewhere inside the cluster, thus distributing resource usage much better.

Let's start with an elementary example. If we can list the images, we'll prove that running docker commands inside containers works. Since, from Kubernetes' point of view, Pods are the...