matchExpression-pod.yaml

kind: Deployment
metadata:
  name: expert
  labels:
    run: app
apiVersion: apps/v1
spec:
  replicas: 4
  selector:
    matchLabels:
      ver: v1
    matchExpressions:
    #   - {key: "kernel", operator: Exists, values: }    # In case of Exists,DoesNotExist value must be empty. It will fix later on patch.
    #   - {key: "kernel", operator: NotIn, values: ["v1","v2"]}     # kernel value is not v1, v2.   
        - {key: "kernel", operator: In, values: ["latest","new"]}
        - {key: "env", operator: In, values: ["server","app"]}
  template:
    metadata:
      name: rush
      labels:
        ver: v1
        kernel: latest
        env: server
    spec:
      volumes:
        - name: vamp
          emptyDir: {}
      containers:
        - image: nginx
          name: web-app
          ports:
            - containerPort: 80
          volumeMounts:
            - name: vamp
              mountPath: /usr/share/nginx/html
      initContainers:
        - image: busybox
          name: helper
          command:
            - sh
            - -c
          args:
            - echo "This is your web page" > /tmp/index.html
          volumeMounts:
            - name: vamp
              mountPath: /tmp/