python/django/python-guestbook/kubernetes-manifests/guestbook-app.deployment.yaml

apiVersion: apps/v1
kind: Deployment
metadata:
  name: python-guestbook-frontend
  labels:
    app: python-guestbook
    tier: frontend
spec:
  replicas: 1
  selector:
    matchLabels:
      app: python-guestbook
      tier: frontend
  template:
    metadata:
      labels:
        app: python-guestbook
        tier: frontend
    spec:
      initContainers:
      # Wait for the database to get ready before starting the server, otherwise
      # the server will crash
      - name: check-db-ready
        image: postgres
        command: ['sh', '-c',
          'until pg_isready -h python-guestbook-db -p 5432;
          do echo waiting for database; sleep 2; done;']
      containers:
      - name: frontend
        image: python-guestbook-frontend-django
        ports:
        - name: http-server
          containerPort: 8080
        env:
        - name: DATABASE_NAME
          value: "postgres"
        - name: DATABASE_USER
          value: "postgres"
        - name: DATABASE_HOST
          value: "python-guestbook-db"
        - name: DATABASE_PORT
          value: "5432"