Auto-generated by Trail System

Dockerfile

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+FROM python:3.9-slim as build
+WORKDIR /app
+COPY requirements.txt .
+RUN pip install --user -r requirements.txt
+
+FROM python:3.9-slim
+WORKDIR /app
+COPY --from=build /root/.local /root/.local
+COPY . .
+RUN apt-get update && apt-get install -y --no-install-recommends adduser && adduser --disabled-password --gecos '' appuser && chown -R appuser /app
+USER appuser
+ENV PATH=/root/.local/bin:$PATH
+CMD ["python", "app.py"]

app.py

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+from flask import Flask
+
+app = Flask(__name__)
+
+@app.route('/')
+def home():
+    """Handle the root endpoint, returns 'Todo List' as a string."""
+    return 'Todo List'
+
+@app.errorhandler(404)
+def not_found(e):
+    """Handle 404 Not Found errors with a custom message."""
+    return 'Page not found', 404
+
+@app.errorhandler(500)
+def server_error(e):
+    """Handle 500 Internal Server Error with a custom message."""
+    return 'Internal server error', 500
+
+if __name__ == '__main__':
+    app.run(debug=False)

chart/Chart.yaml

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+apiVersion: v2
+name: todo-app
+description: A simple Flask-based Todo App hosted in a Docker container with Helm orchestration. The application exposes a single endpoint at '/' that returns 'Todo List'. Uses minimal dependencies and follows 12-factor principles for containerized deployment.
+type: application
+version: 0.1.0
+appVersion: "1.0.0"

chart/templates/deployment.yaml

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+apiVersion: apps/v1
+kind: Deployment
+metadata:
+  name: flask-todo-app
+spec:
+  replicas: 1
+  selector:
+    matchLabels:
+      app: flask-todo-app
+  template:
+    metadata:
+      labels:
+        app: flask-todo-app
+    spec:
+      containers:
+      - name: flask-todo-app
+        image: {{ .Values.image.repository }}:{{ .Values.image.tag }}
+        ports:
+        - containerPort: 5000
+        env:
+        - name: FLASK_APP
+          value: "{{ .Values.env.FLASK_APP }}"
+        - name: DEBUG
+          value: "{{ .Values.env.DEBUG }}"

chart/templates/service.yaml

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+apiVersion: v1
+kind: Service
+metadata:
+  name: {{ .Values.service.name }}
+spec:
+  ports:
+    - port: {{ .Values.service.port }}
+  selector:
+    app: {{ .Values.app.name }}

chart/values.yaml

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+image:
+  repository: flask-todo-app
+  tag: latest
+service:
+  port: 5000
+env:
+  FLASK_APP: app.py
+  DEBUG: "False"

requirements.txt

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+Flask