What are some examples of Kubernetes finalizers?

What are some examples of Kubernetes finalizers?

Kubernetes finalizers are used to control the deletion of resources. They allow you to execute custom logic before a resource is deleted. For example, you might have a finalizer that ensures all dependent resources are cleaned up before the main resource is removed.

Can you give me a specific example of a finalizer in action?

Sure! Let's say you have a custom resource called 'MyApp'. You can add a finalizer like 'myapp.finalizers.example.com' to it. When you try to delete 'MyApp', Kubernetes will prevent the deletion until your finalizer logic runs, which could involve deleting associated resources or notifying other services.

How do I implement a finalizer in my Kubernetes resource?

To implement a finalizer, you need to modify the resource's metadata to include the finalizer name. Then, in your controller, you should watch for deletion events and handle the cleanup logic before removing the finalizer from the resource.

What happens if the finalizer logic fails?

If the finalizer logic fails, the resource will remain in a 'deleting' state, and Kubernetes will not complete the deletion until the finalizer is removed. It's important to handle errors gracefully in your finalizer logic.