What are Kubernetes finalizers and how do I use them?

What are Kubernetes finalizers and how do I use them?

Kubernetes finalizers are special metadata that prevent the deletion of a resource until certain conditions are met. They allow you to execute cleanup logic before a resource is removed.

Can you give me an example of how to implement a finalizer?

Sure! You can add a finalizer to a resource by modifying its metadata. For example, in a custom resource definition, you can add a finalizer like this: metadata: { finalizers: ["example.com/my-finalizer"] }.

What happens if the finalizer logic fails?

If the finalizer logic fails, the resource will not be deleted. You need to ensure that the finalizer's cleanup logic is robust and handles errors properly.

How can I remove a finalizer once I'm done?

To remove a finalizer, you can update the resource by removing the finalizer from the metadata. This can be done using a PATCH request to the Kubernetes API.