What are Kubernetes finalizers and how do they work?

What are Kubernetes finalizers and how do they work?

Kubernetes finalizers are a mechanism that allows you to control the deletion of resources. They ensure that certain cleanup actions are completed before a resource is fully deleted.

Can you give me an example of how to use finalizers in a custom resource?

Sure! You can add a finalizer to your custom resource definition (CRD) by including it in the metadata. When you delete the resource, the finalizer will prevent the deletion until your cleanup logic is executed.

What happens if a finalizer is stuck and doesn't allow the resource to be deleted?

If a finalizer is stuck, the resource will remain in a 'terminating' state. You may need to manually remove the finalizer from the resource's metadata to allow deletion.

Are there any best practices for using finalizers?

Yes, it's best to keep finalizer logic simple, ensure it completes quickly, and handle errors gracefully to avoid resource leaks.