apiVersion: v1
kind: Namespace
metadata:
  name: nginx-app
---
apiVersion: apps/v1
kind: Deployment
metadata:
  name: flask-app
  namespace: nginx-app
  labels:
    app: flask-app
spec:
  replicas: 2
  selector:
    matchLabels:
      app: flask-app
  template:
    metadata:
      labels:
        app: flask-app
    spec:
      containers:
      - name: flask
        image: python:3.9-slim
        ports:
        - containerPort: 8000
        env:
        - name: FLASK_APP
          value: "app.py"
        command:
        - sh
        - -c
        - |
          pip install flask && \
          echo '
          from flask import Flask
          app = Flask(__name__)
          
          @app.route("/")
          def hello():
              return "<h1>Hello from Flask on port 8000!</h1>"
          
          if __name__ == "__main__":
              app.run(host="0.0.0.0", port=8000)
          ' > /app.py && \
          python /app.py
        resources:
          requests:
            memory: "64Mi"
            cpu: "250m"
          limits:
            memory: "128Mi"
            cpu: "500m"

---
apiVersion: v1
kind: Service
metadata:
  name: flask-service
  namespace: nginx-app
  labels:
    app: flask-app
spec:
  selector:
    app: flask-app
  ports:
    - protocol: TCP
      port: 80
      targetPort: 8000
  type: ClusterIP