Error on "HelloWorld" example

[godardt]

Describe the bug

I'm getting the following error when I try to apply the helloworld example from examples/helloWorld:

$ kubectl apply -k $DEMO_HOME/base
error: json: unknown field "metadata"

Files that can reproduce the issue

Thes files from https://raw.githubusercontent.com/kubernetes-sigs/kustomize/master/examples/helloWorld/{configMap,deployment,kustomization,service}.yaml

Expected output

exit 0 with successful application

Actual output

error: json: unknown field "metadata"

Kustomize version

I'm using kubectl -k ... from Docker desktop on Windows with:

$ k version
Client Version: version.Info{Major:"1", Minor:"18", GitVersion:"v1.18.12", GitCommit:"7cd5e9086de8ae25d6a1514d0c87bac67ca4a481", GitTreeState:"clean", BuildDate:"2020-11-12T09:18:55Z", GoVersion:"go1.13.15", Compiler:"gc", Platform:"linux/amd64"}

Platform

Linux (Windows WSL)

Resolution

Change kustomization.yaml from:

apiVersion: kustomize.config.k8s.io/v1beta1
kind: Kustomization
metadata:
  name: arbitrary

# Example configuration for the webserver
# at https://github.com/monopole/hello
commonLabels:
  app: hello

resources:
- deployment.yaml
- service.yaml
- configMap.yaml

to

apiVersion: kustomize.config.k8s.io/v1beta1
kind: Kustomization

# Example configuration for the webserver
# at https://github.com/monopole/hello
commonLabels:
  app: hello

resources:
- deployment.yaml
- service.yaml
- configMap.yaml

I'm posting the issue so that someone may update the kustomization.yaml if it's not an issue related to my own env (I'm not experimented enough with k8s/kustomize to say if that's the case).

[Shell32-Natsu]

I think this is a documentation issue in the example. Previously kustomization doesn't have metadata field and we added it months ago. kustomize version shipped with kubectl hasn't been updated for a long time.

[monopole]

Please use "bare" kustomize: https://kubectl.docs.kubernetes.io/installation/kustomize/binaries
and pipe the output to kubectl -f -, e.g.

kustomize build $DEMO_HOME/base | kubectl -f -

The hello world example is validated as part of it's release process.

The version in kubectl is very old; work to update it is tracking in #1500

[godardt]

@monopole in that case you should at least update the docs since the doc uses kubectl, see here

[codetheweb]

I would also appreciate a documentation update as I stumbled into this today as a new user of kustomize.