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Kubernetes for Developers

You're reading from  Kubernetes for Developers

Product type Book
Published in Apr 2018
Publisher Packt
ISBN-13 9781788834759
Pages 374 pages
Edition 1st Edition
Languages
Author (1):
Joseph Heck Joseph Heck
Profile icon Joseph Heck

Table of Contents (16) Chapters

Title Page
Packt Upsell
Contributors
Preface
1. Setting Up Kubernetes for Development 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 1. Other Books You May Enjoy Index

Probes 


The two probes enabled in Kubernetes are the liveness probe and readiness Probe. They are complimentary, but different in intent and usage, and can be defined for each container within a Pod. In both cases, they provide a means for your code to influence how Kubernetes manages the containers.

Liveness probe

The most basic probe is the Liveness probe. If defined, it provides a command or URL that Kubernetes can use to determine whether a Pod is still operational. If the call succeeds, Kubernetes will assume the container is healthy; if it fails to respond, then the Pod can be handled as the restartPolicy is defined. The result is binary: either the probe succeeds, and Kubernetes believes your Pod is running, or it fails, so Kubernetes believes your Pod is no longer functional. In the latter case, it will check with the defined RestartPolicy to choose what to do.

The default value for restartPolicy is Always, meaning if a container within the Pod fails, Kubernetes will always attempt...

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