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Mastering Kubernetes

You're reading from  Mastering Kubernetes

Product type Book
Published in May 2017
Publisher Packt
ISBN-13 9781786461001
Pages 426 pages
Edition 1st Edition
Languages
Author (1):
Gigi Sayfan Gigi Sayfan
Profile icon Gigi Sayfan
Toc

Table of Contents (22) Chapters close

Mastering Kubernetes
Credits
About the Author
About the Reviewer
www.PacktPub.com
Customer Feedback
Preface
1. Understanding Kubernetes Architecture 2. Creating Kubernetes Clusters 3. Monitoring, Logging, and Troubleshooting 4. High Availability and Reliability 5. Configuring Kubernetes Security, Limits, and Accounts 6. Using Critical Kubernetes Resources 7. Handling Kubernetes Storage 8. Running Stateful Applications with Kubernetes 9. Rolling Updates, Scalability, and Quotas 10. Advanced Kubernetes Networking 11. Running Kubernetes on Multiple Clouds and Cluster Federation 12. Customizing Kubernetes - API and Plugins 13. Handling the Kubernetes Package Manager 14. The Future of Kubernetes Index

Shared environment variables versus DNS records for discovery


Kubernetes provides several mechanisms for global discovery across the cluster. If your storage cluster is not managed by Kubernetes, you still need to tell Kubernetes pods how to find it and access it. There are two main methods:

  • DNS

  • Environment variables

In some cases, you may want to use both where environment variables can override DNS.

Accessing external data stores via DNS

The DNS approach is simple and straightforward. Assuming your external storage cluster is load balanced and can provide a stable endpoint, then pods can just hit directly that endpoint and connect to the external cluster.

Accessing external data stores via environment variables

Another simple approach is to use environment variables to pass connection information to an external storage cluster. Kubernetes offers the ConfigMap resource as a way to keep configuration separate from the container image. The configuration is a set of key-value pairs. The configuration...

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