kubernetes-course/service-discovery/helloworld-db.yml

apiVersion: apps/v1
kind: Deployment
metadata:
  name: helloworld-deployment
spec:
  replicas: 3
  selector:
    matchLabels:
      app: helloworld-db
  template:
    metadata:
      labels:
        app: helloworld-db
    spec:
      containers:
      - name: k8s-demo
        image: wardviaene/k8s-demo
        command: ["node", "index-db.js"]
        ports:
        - name: nodejs-port
          containerPort: 3000
        env:
          - name: MYSQL_HOST
            value: database-service
          - name: MYSQL_USER
            value: root
          - name: MYSQL_PASSWORD
            valueFrom:
              secretKeyRef:
                name: helloworld-secrets
                key: rootPassword
          - name: MYSQL_DATABASE
            valueFrom:
              secretKeyRef:
                name: helloworld-secrets
                key: database