Exclude Resource in kustomization.yaml

Question

You can omit the specific resource by using a delete directive of Strategic Merge Patch like this.

Folder structure

$ tree .
.
├── base
│   ├── kustomization.yaml
│   └── namespace.yaml
└── overlays
    ├── dev
    │   └── kustomization.yaml
    └── prod
        ├── delete-ns-b.yaml
        └── kustomization.yaml

File content

$ cat base/kustomization.yaml
resources:
  - namespace.yaml

$  cat base/namespace.yaml
apiVersion: v1
kind: Namespace
metadata:
  name: ns-a
---
apiVersion: v1
kind: Namespace
metadata:
  name: ns-b

$ cat overlays/dev/kustomization.yaml
bases:
  - ../../base

$ cat overlays/prod/delete-ns-b.yaml
$patch: delete
apiVersion: v1
kind: Namespace
metadata:
  name: ns-b

$ cat overlays/prod/kustomization.yaml
bases:
  - ../../base
patches:
  - path: delete-ns-b.yaml

Behavior of kustomize

$ kustomize build overlays/dev
apiVersion: v1
kind: Namespace
metadata:
  name: ns-a
---
apiVersion: v1
kind: Namespace
metadata:
  name: ns-b

$ kustomize build overlays/prod
apiVersion: v1
kind: Namespace
metadata:
  name: ns-a

In this case, we have two namespaces in the base folder. In dev, kustomize produces 2 namespaces because there is no patch. But, in prod, kustomize produces only one namespace because delete patch deletes namespace ns-b.

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