You're reading from The Ultimate Docker Container Book Build, test, ship, and run containers with Docker and Kubernetes

Product type Paperback

Published in Aug 2023

Publisher Packt

ISBN-13 9781804613986

Length 626 pages

Edition 3rd Edition

Tools

Docker

Concepts

DevOps

Author (1):

Dr. Gabriel N. Schenker

View More author details

Table of Contents (26) Chapters

Preface

1. Part 1:Introduction

2. Chapter 1: What Are Containers and Why Should I Use Them? FREE CHAPTER

3. Chapter 2: Setting Up a Working Environment

4. Part 2:Containerization Fundamentals

5. Chapter 3: Mastering Containers

6. Chapter 4: Creating and Managing Container Images

7. Chapter 5: Data Volumes and Configuration

8. Chapter 6: Debugging Code Running in Containers

9. Chapter 7: Testing Applications Running in Containers

10. Chapter 8: Increasing Productivity with Docker Tips and Tricks

11. Part 3:Orchestration Fundamentals

12. Chapter 9: Learning about Distributed Application Architecture

13. Chapter 10: Using Single-Host Networking

14. Chapter 11: Managing Containers with Docker Compose

15. Chapter 12: Shipping Logs and Monitoring Containers

16. Chapter 13: Introducing Container Orchestration

17. Chapter 14: Introducing Docker Swarm

18. Chapter 15: Deploying and Running a Distributed Application on Docker Swarm

19. Part 4:Docker, Kubernetes, and the Cloud

20. Chapter 16: Introducing Kubernetes

21. Chapter 17: Deploying, Updating, and Securing an Application with Kubernetes

22. Chapter 18: Running a Containerized Application in the Cloud

23. Chapter 19: Monitoring and Troubleshooting an Application Running in Production

24. Index

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Cluster nodes

Cluster nodes are the nodes with which Kubernetes schedules application workloads. They are the workhorses of the cluster. A Kubernetes cluster can have a few, dozens, hundreds, or even thousands of cluster nodes. Kubernetes has been built from the ground up for high scalability. Don’t forget that Kubernetes was modeled on Google Borg, which has run tens of thousands of containers for years:

Figure 16.3 – Kubernetes worker node

A worker node – which is a cluster node, as are the master nodes – can run on a VM, bare metal, on-premises, or in the cloud. Originally, worker nodes could only be configured on Linux. But since version 1.10 of Kubernetes, worker nodes can also run on Windows Server 2010 or later. It is perfectly fine to have a mixed cluster with Linux and Windows worker nodes.

On each node, we have three services that need to run, as follows: