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Getting Started with Kubernetes, Second Edition

Getting Started with Kubernetes, Second Edition

By : Jonathan Baier
4.7 (3)
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Getting Started with Kubernetes, Second Edition

Getting Started with Kubernetes, Second Edition

4.7 (3)
By: Jonathan Baier

Overview of this book

Kubernetes has continued to grow and achieve broad adoption across various industries, helping you to orchestrate and automate container deployments on a massive scale. This book will give you a complete understanding of Kubernetes and how to get a cluster up and running. You will develop an understanding of the installation and configuration process. The book will then focus on the core Kubernetes constructs such as pods, services, replica sets, replication controllers, and labels. You will also understand how cluster level networking is done in Kubernetes. The book will also show you how to manage deployments and perform updates with minimal downtime. Additionally, you will learn about operational aspects of Kubernetes such as monitoring and logging. Advanced concepts such as container security and cluster federation will also be covered. Finally, you will learn about the wider Kubernetes ecosystem with OCP, CoreOS, and Tectonic and explore the third-party extensions and tools that can be used with Kubernetes. By the end of the book, you will have a complete understanding of the Kubernetes platform and will start deploying applications on it.
Table of Contents (13 chapters)
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Deployments


In the previous chapter, we explored some of the core concepts for application updates using the old rolling-update method. Starting with version 1.2, Kubernetes added the Deployment construct, which improves on the basic mechanisms of rolling-update and Replication Controllers. As the name suggests, it gives us a finer control of the code deployment itself. Deployments allow us to pause and resume application rollouts. Additionally, it keeps a history of past deployments and allows the user to easily rollback to previous versions.

In the following, listing 5-1, we can see that the definition is very similar to a Replication Controller. The main difference is that we now have an ability to make changes and updates to the deployment objects and let Kubernetes manage updating the underlying pods and replicas for us:

apiVersion: extensions/v1beta1
kind: Deployment
metadata:
  name: node-js-deploy
labels:
    name: node-js-deploy
spec:
    replicas: 1
   template:
     metadata:
 ...

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