Is it possible to use kustomize to lookup into deployed K8s resource?

[jaythamke]

Hi,
I am trying out replacements (former vars) feature (kustomize version v5.4.*) to replace the configuration from source to target.
For me the source is a Kubernetes secret but already deployed in a cluster and I want to lookup the deployed secret data e.g. .spec.data.foo into the given target field.
I could successfully replace the placeholders if it is placed in a file. But I did not find how to fetch that secret from a deployed secret object. Is it really possible and how it can be achieved? Thanks

[ChristianCiach]

It's not possible. Kustomize is a manifest generator, not a deployment tool. Kustomize never connects to a Kubernetes cluster.