Book Image

Getting Started with Kubernetes - Third Edition

By : Jonathan Baier, Jesse White
Book Image

Getting Started with Kubernetes - Third Edition

By: Jonathan Baier, Jesse White

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. Based on the recent release of Kubernetes 1.12, Getting Started with Kubernetes gives you a complete understanding of how to install a Kubernetes cluster. The book focuses on core Kubernetes constructs, such as pods, services, replica sets, replication controllers, and labels. You will understand cluster-level networking in Kubernetes, and learn to set up external access to applications running in the cluster. As you make your way through the book, you'll understand how to manage deployments and perform updates with minimal downtime. In addition to this, you will explore operational aspects of Kubernetes , such as monitoring and logging, later moving on to advanced concepts such as container security and cluster federation. You'll get to grips with integrating your build pipeline and deployments within a Kubernetes cluster, and be able to understand and interact with open source projects. In the concluding chapters, you'll orchestrate updates behind the scenes, avoid downtime on your cluster, and deal with underlying cloud provider instability within your cluster. By the end of this book, you'll have a complete understanding of the Kubernetes platform and will start deploying applications on it.
Table of Contents (23 chapters)
Title Page
Dedication
Packt Upsell
Contributors
Preface
Index

Node selection


As mentioned previously, we can schedule DaemonSets to run on a subset of nodes as well. This can be achieved using something called nodeSelectors. These allow us to constrain the nodes a pod runs on, by looking for specific labels and metadata. They simply match key-value pairs on the labels for each node. We can add our own labels or use those that are assigned by default.

 

 

The default labels are listed in the following table:

Default node labels

Description

kubernetes.io/hostname

This shows the hostname of the underlying instance or machine

beta.kubernetes.io/os

This shows the underlying operating system as a report in the Go language

beta.kubernetes.io/arch

This shows the underlying processor architecture as a report in the Go language

beta.kubernetes.io/instance-type

This is the instance type of the underlying cloud provider (cloud-only) 

failure-domain.beta.kubernetes.io/region

This is the region of the underlying cloud provider (cloud-only) 

failure-domain.beta.kubernetes.io/zone...