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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
+2 more Show less
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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

Persistent Volumes

The Volumes we have seen so far have the limitation that their life cycle depends on the life cycle of pods. Volumes such as emptyDir or hostPath get deleted when the pod using them is deleted or gets restarted. For example, if we use Volumes to store user data and inventory records for our e-commerce website, the data will be deleted when the application pod restarts. Hence, Volumes are not suited to store data that you want to persist.

To solve this problem, Kubernetes supports persistent storage in the form of a Persistent Volume (PV). A PV is a Kubernetes object that represents a block of storage in the cluster. It can either be provisioned beforehand by the cluster administrators or be dynamically provisioned. A PV can be considered a cluster resource just like a node and, hence, it is not scoped to a single namespace. These Volumes work similarly to the Volumes we have seen in previous sections. The life cycle of a PV doesn't depend on the life cycle...

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