What are Kubernetes webhooks and how do they work for validation?

What are Kubernetes webhooks and how do they work for validation?

Kubernetes webhooks are HTTP callbacks that receive events from the Kubernetes API server. They can be used for validation by intercepting requests to create or update resources, allowing you to enforce custom rules.

Can you explain the difference between admission webhooks and validation webhooks?

Sure! Admission webhooks are a broader category that includes both validation and mutation webhooks. Validation webhooks check if a request is valid, while mutation webhooks can modify the request before it's processed.

How do I set up a validation webhook in my Kubernetes cluster?

To set up a validation webhook, you need to create a webhook configuration that points to your service, which will handle the validation logic. You'll also need to ensure your service is reachable and can handle HTTPS requests.

What are some common use cases for validation webhooks?

Common use cases include enforcing naming conventions, validating resource limits, and ensuring compliance with organizational policies.