[SOLVED] How to override a namespace override

How to override a namespace override

In the following scenario I have my containers defined in ../base/.

In this /dev/ directory I want to start all the deployments and statefulsets in namespace dev.

The rub is that I also want to run the local-path-storage CSI in the local-path-storage namespace. kustomize will override it and create it in the "dev" namespace.

apiVersion: kustomize.config.k8s.io/v1beta1
kind: Kustomization
namespace: dev
bases:
  - ../base    
resources:
  - local-path-storage.yaml

How can I undo the namespace override for just local-path-storage.yaml?

Solution

It is possible since kustomize 4.5.6 by adding a namespaceTransformer. You want to set the field unsetOnly to true.

Here is an example:

apiVersion: kustomize.config.k8s.io/v1beta1
kind: Kustomization
bases:
 - ../base    
resources:
 - local-path-storage.yaml
transformers:
  - |-
    apiVersion: builtin
    kind: NamespaceTransformer
    metadata:
      name: notImportantHere
      namespace: dev
    unsetOnly: true

This should set the namespace to dev for all resources that DO NOT have a namespace set.

Link to namespaceTransformer spec: https://kubectl.docs.kubernetes.io/references/kustomize/builtins/#_namespacetransformer_