README.md

Install kustomize

brew install kustomize

Prepare namespace prefix

export NS_PREFIX=chanwit

Create 2 directories

mkdir podinfo
mkdir prod

Create 2 Subnamespaces

Don't forget to prefix the objects with your name first.

cat <<EOF | kubectl apply -f -
---
apiVersion: hnc.x-k8s.io/v1alpha2
kind: SubnamespaceAnchor
metadata:
  namespace: team-denim
  name: ${NS_PREFIX}-dev
---
apiVersion: hnc.x-k8s.io/v1alpha2
kind: SubnamespaceAnchor
metadata:
  namespace: team-denim
  name: ${NS_PREFIX}-prod
EOF

Check Subnamespaces

kubectl get subns

Go into podinfo DIR

cd podinfo
# download deployment.yaml and service.yaml, place them in the podinfo dir

Run Kustomize

kustomize create --autodetect --namespace=${NS_PREFIX}-dev
cat kustomization.yaml

Run Kustomize Build

kustomize build .

Now move to the prod DIR

cd ../prod
kustomize create --resources ../podinfo --namespace ${NS_PREFIX}-prod

# This is the real flags used by Flux when process the FLux's Kustomization objects.
kustomize build --load-restrictor=LoadRestrictionsNone --reorder=legacy .

deployment.yaml

apiVersion: apps/v1
kind: Deployment
metadata:
  name: podinfo
spec:
  minReadySeconds: 3
  revisionHistoryLimit: 5
  progressDeadlineSeconds: 60
  strategy:
    rollingUpdate:
      maxUnavailable: 0
    type: RollingUpdate
  selector:
    matchLabels:
      app: podinfo
  template:
    metadata:
      annotations:
        prometheus.io/scrape: "true"
        prometheus.io/port: "9797"
      labels:
        app: podinfo
    spec:
      containers:
      - name: podinfod
        image: ghcr.io/stefanprodan/podinfo:6.2.0
        imagePullPolicy: IfNotPresent
        ports:
        - name: http
          containerPort: 9898
          protocol: TCP
        - name: http-metrics
          containerPort: 9797
          protocol: TCP
        - name: grpc
          containerPort: 9999
          protocol: TCP
        command:
        - ./podinfo
        - --port=9898
        - --port-metrics=9797
        - --grpc-port=9999
        - --grpc-service-name=podinfo
        - --level=info
        - --random-delay=false
        - --random-error=false
        env:
        - name: PODINFO_UI_COLOR
          value: "#34577c"
        livenessProbe:
          exec:
            command:
            - podcli
            - check
            - http
            - localhost:9898/healthz
          initialDelaySeconds: 5
          timeoutSeconds: 5
        readinessProbe:
          exec:
            command:
            - podcli
            - check
            - http
            - localhost:9898/readyz
          initialDelaySeconds: 5
          timeoutSeconds: 5
        resources:
          limits:
            cpu: 2000m
            memory: 512Mi
          requests:
            cpu: 100m
            memory: 64Mi

service.yaml

apiVersion: v1
kind: Service
metadata:
  name: podinfo
spec:
  type: ClusterIP
  selector:
    app: podinfo
  ports:
    - name: http
      port: 9898
      protocol: TCP
      targetPort: http
    - port: 9999
      targetPort: grpc
      protocol: TCP
      name: grpc

subns.yaml

---
apiVersion: hnc.x-k8s.io/v1alpha2
kind: SubnamespaceAnchor
metadata:
  namespace: team-denim
  name: <your-user>-dev
---
apiVersion: hnc.x-k8s.io/v1alpha2
kind: SubnamespaceAnchor
metadata:
  namespace: team-denim
  name: <your-user>-prod