Working Deployment Spec with ConfigMaps

vote-deploy-cm.yaml

apiVersion: apps/v1
kind: Deployment
metadata:
  name: vote
  labels:
    role: vote
  annotations:
    kubernetes.io/change-cause: "image updated to v4"
spec:
  replicas: 4
  minReadySeconds: 20
  strategy:
    type: RollingUpdate
    rollingUpdate:
      maxSurge: 2
      maxUnavailable: 1
  selector:
    matchLabels:
      app: python
      role: vote
    matchExpressions:
      - key: version
        operator: Exists
  template:
    metadata:
      name: vote
      labels:
        app: python
        role: vote
        version: v4
    spec:
      containers:
        - name: app
          image: schoolofdevops/vote:v4
          envFrom:
            - configMapRef:
                name: vote
                optional: true
          resources:
            requests:
              memory: "64Mi"
              cpu: "50m"
            limits:
              memory: "128Mi"
              cpu: "250m"
          volumeMounts:
            - name: config
              mountPath: "/app/config"
              readOnly: true
      volumes:
        - name: config
          configMap:
            name: vote
            items:
              - key: "development_config.py"
                path: "development_config.py"
              - key: "production_config.py"
                path: "production_config.py"
            optional: true