Book Image

Learn Docker - Fundamentals of Docker 18.x

By : Dr. Gabriel N. Schenker
Book Image

Learn Docker - Fundamentals of Docker 18.x

By: Dr. Gabriel N. Schenker

Overview of this book

Docker containers have revolutionized the software supply chain in small and big enterprises. Never before has a new technology so rapidly penetrated the top 500 enterprises worldwide. Companies that embrace containers and containerize their traditional mission-critical applications have reported savings of at least 50% in total maintenance cost and a reduction of 90% (or more) of the time required to deploy new versions of those applications. Furthermore they are benefitting from increased security just by using containers as opposed to running applications outside containers. This book starts from scratch, introducing you to Docker fundamentals and setting up an environment to work with it. Then we delve into concepts such as Docker containers, Docker images, Docker Compose, and so on. We will also cover the concepts of deployment, orchestration, networking, and security. Furthermore, we explain Docker functionalities on public clouds such as AWS. By the end of this book, you will have hands-on experience working with Docker containers and orchestrators such as SwarmKit and Kubernetes.
Table of Contents (21 chapters)
Title Page
Packt Upsell
Contributors
Preface
Index

Introduction to Minikube


Minikube is a tool that creates a single node Kubernetes cluster in VirtualBox or Hyper-V (other hypervisors are supported) ready to be used during development of a containerized application. We have shown in Chapter 2Setting up a Working Environment, how Minikube and with it the tool  kubectl can be installed on your Mac or Windows laptop. As stated, Minikube is a single node Kubernetes cluster and thus the node is, at the same time, a Kubernetes master as well as a worker node.

Let's make sure that Minikube is running with the following command:

$ minikube start

Once Minikube is ready, we can access its single node cluster using kubectl. And we should see something similar to the following screenshot:

Listing all nodes in Minikube

As mentioned before, we have a single node cluster with a node called minikube . Don't get confused by the value <none> in the column ROLES; the node  plays the role of a worker and a master node at the same time.

Now, let's try to...