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Kubernetes for Developers

You're reading from   Kubernetes for Developers Use Kubernetes to develop, test, and deploy your applications with the help of containers

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Product type Paperback
Published in Apr 2018
Publisher Packt
ISBN-13 9781788834759
Length 374 pages
Edition 1st Edition
Languages
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Author (1):
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Joseph Heck Joseph Heck
Author Profile Icon Joseph Heck
Joseph Heck
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Table of Contents (12) Chapters Close

Preface 1. Setting Up Kubernetes for Development FREE CHAPTER 2. Packaging Your Code to Run in Kubernetes 3. Interacting with Your Code in Kubernetes 4. Declarative Infrastructure 5. Pod and Container Lifecycles 6. Background Processing in Kubernetes 7. Monitoring and Metrics 8. Logging and Tracing 9. Integration Testing 10. Troubleshooting Common Problems and Next Steps 11. Other Books You May Enjoy

Kubernetes concepts – labels


In the first example, you saw how creating a deployment also created a ReplicaSet and related pods, in order to run your software.

Kubernetes has a very flexible mechanism for connecting and referencing objects that it manages. Rather than having a very strict hierarchy of what can be connected, the Kubernetes project uses short, definitive key/value pairs as set of tags on resources, called labels. There is a matching mechanism to query and find related labels, called Selectors.

Labels are fairly strictly defined in format, and are intended to group together resources in Kubernetes. They are not intended to identify a single or unique resource. They can be used to describe relevant information about a set of Kubernetes resources, be that a Pod, ReplicaSet, Deployment, and so on.

As we mentioned earlier, labels are key-value structures. The keys in labels are limited in size and may include an optional prefix, followed by a / character, and then the rest of the...

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