Add a namesapce

apps/kustomization.yaml

@@ -1,4 +1,5 @@
 apiVersion: kustomize.config.k8s.io/v1beta1
 kind: Kustomization
+namespace: apps
 resources:
 - whoami

apps/whoami/ingress.yaml

@@ -10,4 +10,4 @@ spec:
     kind: Rule
     services:
     - name: podinfo
-      namespace: default
+      namespace: apps