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The DevOps 2.3 Toolkit

You're reading from   The DevOps 2.3 Toolkit Kubernetes: Deploying and managing highly-available and fault-tolerant applications at scale

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Product type Paperback
Published in Sep 2018
Publisher Packt
ISBN-13 9781789135503
Length 418 pages
Edition 1st Edition
Concepts
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Author (1):
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Viktor Farcic Viktor Farcic
Author Profile Icon Viktor Farcic
Viktor Farcic
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Table of Contents (18) Chapters Close

Preface 1. How Did We Get Here? FREE CHAPTER 2. Running Kubernetes Cluster Locally 3. Creating Pods 4. Scaling Pods With ReplicaSets 5. Using Services to Enable Communication between Pods 6. Deploying Releases with Zero-Downtime 7. Using Ingress to Forward Traffic 8. Using Volumes to Access Host's File System 9. Using ConfigMaps to Inject Configuration Files 10. Using Secrets to Hide Confidential Information 11. Dividing a Cluster into Namespaces 12. Securing Kubernetes Clusters 13. Managing Resources 14. Creating a Production-Ready Kubernetes Cluster 15. Persisting State 16. The End 17. Other Books You May Enjoy

Pods are (almost) useless (by themselves)

Pods are fundamental building blocks in Kubernetes. In most cases, you will not create Pods directly. Instead, you'll use higher level constructs like Controllers.

Pods are disposable. They are not long lasting services. Even though Kubernetes is doing its best to ensure that the containers in a Pod are (almost) always up-and-running, the same cannot be said for Pods. If a Pod fails, gets destroyed, or gets evicted from a Node, it will not be rescheduled. At least, not without a Controller. Similarly, if a whole node is destroyed, all the Pods on it will cease to exist. Pods do not heal by themselves. Excluding some special cases, Pods are not meant to be created directly.

Do not create Pods by themselves. Let one of the controllers create Pods for you.
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