kubectl 补丁部署日期返回错误

Question

When I try

kubectl patch deployment my-node-app -p "{\"spec\":{\"template\":{\"metadata\":{\"labels\":{\"date\":\" date +'%s' \"}}}}}" -n my-namespace

I get below error:

The Deployment "my-node-app" is invalid: spec.template.labels: Invalid value: " date +'%s' ": a valid label must be an empty string or consist of alphanumeric characters, '-', '_' or '.', and must start and end with an alphanumeric character (eg 'MyValue', or 'my_value', or '12345', regex used for validation is '(([A-Za-z0-9][-A-Za-z0-9_.]*)?[A-Za-z0-9])?')

What am I missing in my code?

apiVersion: apps/v1
kind: Deployment
metadata:
  name: node
  namespace: dev
  labels:
    app: my-node-app
spec:
  replicas: 2
  selector:
    matchLabels:
      app: my-node-app
  template:
    metadata:
      labels:
        app: my-node-app
    spec:
      hostNetwork: true
      securityContext:
        fsGroup: 1000
      containers:
      - name: node
        imagePullPolicy: Always
        image: gcr.io/my-repo/my-node-app:latest
        ports:
        - containerPort: 3000
        envFrom:
          - configMapRef:
              name: my-configmap
        resources:
          requests:
            cpu: 100m
            memory: 128Mi
          limits:
            cpu: 2
            memory: 8Gi
      restartPolicy: Always

Answer 1

You can try to echo your json string:

echo "{"spec":{"template":{"metadata":{"labels":{"date":"date +'%s'"}}}}}"
-> {spec:{template:{metadata:{labels:{date:date +%s}}}}}

In your case, you want to execute the date command, so:

echo "{"spec":{"template":{"metadata":{"labels":{"date":"$(date +'%s')"}}}}}"
-> {spec:{template:{metadata:{labels:{date:1594299081}}}}}

even better, you should wrap the json string in simple quotes:

echo '{"spec":{"template":{"metadata":{"labels":{"date":"'$(date +'%s')'"}}}}}'
-> {"spec":{"template":{"metadata":{"labels":{"date":"1594299282"}}}}}

Also, you don't really need quotes for date +%s