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The Kubernetes Workshop

You're reading from   The Kubernetes Workshop Learn how to build and run highly scalable workloads on Kubernetes

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Product type Paperback
Published in Sep 2020
Publisher Packt
ISBN-13 9781838820756
Length 780 pages
Edition 1st Edition
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Authors (6):
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Zachary Arnold Zachary Arnold
Author Profile Icon Zachary Arnold
Zachary Arnold
Mohammed Abu Taleb Mohammed Abu Taleb
Author Profile Icon Mohammed Abu Taleb
Mohammed Abu Taleb
Wei Huang Wei Huang
Author Profile Icon Wei Huang
Wei Huang
Sahil Dua Sahil Dua
Author Profile Icon Sahil Dua
Sahil Dua
Mélony Qin Mélony Qin
Author Profile Icon Mélony Qin
Mélony Qin
Faisal Masood Faisal Masood
Author Profile Icon Faisal Masood
Faisal Masood
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Toc

Table of Contents (20) Chapters Close

Preface
1. Introduction to Kubernetes and Containers 2. An Overview of Kubernetes FREE CHAPTER 3. kubectl – Kubernetes Command Center 4. How to Communicate with Kubernetes (API Server) 5. Pods 6. Labels and Annotations 7. Kubernetes Controllers 8. Service Discovery 9. Storing and Reading Data on Disk 10. ConfigMaps and Secrets 11. Build Your Own HA Cluster 12. Your Application and HA 13. Runtime and Network Security in Kubernetes 14. Running Stateful Components in Kubernetes 15. Monitoring and Autoscaling in Kubernetes 16. Kubernetes Admission Controllers 17. Advanced Scheduling in Kubernetes 18. Upgrading Your Cluster without Downtime 19. Custom Resource Definitions in Kubernetes

StatefulSets

StatefulSets are used to manage stateful replicas. Similar to a Deployment, a StatefulSet creates and manages the specified number of Pod replicas from an identical Pod template. However, where StatefulSets differ from Deployments is that they maintain a unique identity for each of their Pods. So, even if all the Pods are of identical specs, they are not interchangeable. Each of the Pods has a sticky identity that can be used by the application code to manage the state of the application on a particular Pod. For a StatefulSet with n replicas, each Pod is assigned a unique integer ordinal between 0 and n – 1. The names of the Pods reflect the integer identity assigned to them. When a StatefulSet is created, all the Pods are created in the order of their integer ordinal.

Each of the Pods managed by a StatefulSet will persist their sticky identity (integer ordinal) even if the Pod restarts. For example, if a particular Pod crashes or is deleted, a new Pod will be...

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