Start two simple projects

simple-nginx/nginx-deployment.yaml

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+apiVersion: apps/v1
+kind: Deployment
+metadata:
+  name: nginx
+spec:
+  replicas: 2
+  selector:
+    matchLabels:
+      app: nginx
+  template:
+    metadata:
+      labels:
+        app: nginx
+    spec:
+      containers:
+        - name: nginx
+          image: nginx:latest
+          ports:
+            - containerPort: 80
+---
+apiVersion: v1
+kind: Service
+metadata:
+  name: nginx
+spec:
+  type: NodePort
+  selector:
+    app: nginx
+  ports:
+    - port: 80
+      targetPort: 80
+      nodePort: 30125  # Optional: fixed NodePort
+

simple-proj/Dockerfile

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+FROM python:3.11-slim
+WORKDIR /app
+COPY app.py .
+RUN pip install flask redis
+CMD ["python", "app.py"]
+

simple-proj/app.py

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+# app.py
+from flask import Flask, request, jsonify
+import redis
+
+r = redis.Redis(host='redis', port=6379)
+app = Flask(__name__)
+
+@app.route("/items", methods=["GET", "POST"])
+def items():
+    if request.method == "POST":
+        item = request.json.get("item")
+        if item:
+            r.rpush("shopping_list", item)
+        return '', 204
+    else:
+        items = r.lrange("shopping_list", 0, -1)
+        return jsonify([i.decode() for i in items])
+
+if __name__ == "__main__":
+    app.run(host="0.0.0.0", port=5000)
+

simple-proj/k8s/frontend-deployment.yaml

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+apiVersion: apps/v1
+kind: Deployment
+metadata:
+  name: shoppinglist-frontend
+spec:
+  replicas: 1
+  selector:
+    matchLabels:
+      app: shoppinglist-frontend
+  template:
+    metadata:
+      labels:
+        app: shoppinglist-frontend
+    spec:
+      containers:
+        - name: frontend
+          image: shoppinglist-frontend:latest
+          ports:
+            - containerPort: 5000
+          env:
+            - name: REDIS_HOST
+              value: redis
+            - name: REDIS_PORT
+              value: "6379"
+

simple-proj/k8s/frontend-service.yaml

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+apiVersion: v1
+kind: Service
+metadata:
+  name: shoppinglist-frontend
+spec:
+  selector:
+    app: shoppinglist-frontend
+  ports:
+    - port: 80
+      targetPort: 5000
+  type: NodePort
+

simple-proj/k8s/redis-deployment.yaml

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+apiVersion: apps/v1
+kind: Deployment
+metadata:
+  name: redis
+spec:
+  replicas: 1
+  selector:
+    matchLabels:
+      app: redis
+  template:
+    metadata:
+      labels:
+        app: redis
+    spec:
+      containers:
+        - name: redis
+          image: redis:7-alpine
+          ports:
+            - containerPort: 6379
+

simple-proj/k8s/redis-service.yaml

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+apiVersion: v1
+kind: Service
+metadata:
+  name: redis
+spec:
+  selector:
+    app: redis
+  ports:
+    - port: 6379
+      targetPort: 6379
+  type: ClusterIP
+