Téléverser les fichiers vers "z2"
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12
z2/Dockerfile
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z2/Dockerfile
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FROM python:3.9-slim
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WORKDIR /app
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COPY requirements.txt .
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RUN pip install --no-cache-dir -r requirements.txt
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COPY app.py .
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EXPOSE 5000
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CMD ["gunicorn", "--bind", "0.0.0.0:5000", "app:app"]
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31
z2/README.md
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z2/README.md
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# Shopping List Web App on Kubernetes (Local)
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This project deploys a Flask-based shopping list app with PostgreSQL on a local Kubernetes cluster (Docker Desktop).
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## Prerequisites
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- Docker Desktop with Kubernetes enabled
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- kubectl configured for `docker-desktop` context
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## Files
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- `namespace.yaml`: Kubernetes namespace
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- `persistent-storage.yaml`: PVC for Postgres data
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- `postgres-deployment.yaml` / `postgres-service.yaml`: Postgres setup
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- `deployment.yaml` / `service.yaml`: Web app setup
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- `prepare-app.sh`: build Docker image
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- `start-app.sh`: apply Kubernetes resources
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- `stop-app.sh`: delete all resources
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## Usage
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1. Build the image:
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```bash
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./prepare-app.sh
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2. Deploy to Kubernetes:
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```bash
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./start-app.sh
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3. Access the app:
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Open http://localhost:80 in your browser
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4. Clean up :
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./stop-app.sh
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112
z2/app.py
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z2/app.py
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from flask import Flask, request, redirect, url_for, render_template_string
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import os
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import psycopg2
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from psycopg2 import pool
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app = Flask(__name__)
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DB_HOST = os.getenv('DB_HOST', 'localhost')
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DB_PORT = os.getenv('DB_PORT', '5432')
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DB_NAME = os.getenv('DB_NAME', 'postgres')
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DB_USER = os.getenv('DB_USER', 'postgres')
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DB_PASS = os.getenv('DB_PASS', 'postgres')
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connection_pool = psycopg2.pool.SimpleConnectionPool(
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1, 10,
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host=DB_HOST,
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port=DB_PORT,
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database=DB_NAME,
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user=DB_USER,
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password=DB_PASS
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)
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# Initialize database schema
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with connection_pool.getconn() as conn:
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with conn.cursor() as cur:
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cur.execute('''
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CREATE TABLE IF NOT EXISTS shopping_items (
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id SERIAL PRIMARY KEY,
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item TEXT NOT NULL,
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quantity INTEGER DEFAULT 1,
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purchased BOOLEAN DEFAULT FALSE
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);
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''')
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conn.commit()
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HTML = """
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<!DOCTYPE html>
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<html>
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<head>
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<title>Shopping List</title>
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<meta charset="UTF-8">
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</head>
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<body>
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<h1>Shopping List</h1>
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<form action="/add" method="post">
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<input name="item" placeholder="Item" required>
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<input name="quantity" type="number" value="1" min="1">
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<button type="submit">Add</button>
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</form>
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<ul>
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{% for id, name, qty, done in items %}
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<li>
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{{ name }} ({{ qty }})
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{% if not done %}
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<form action="/toggle/{{ id }}" method="post" style="display:inline">
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<button type="submit">Mark Purchased</button>
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</form>
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{% else %}
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<form action="/toggle/{{ id }}" method="post" style="display:inline">
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<button type="submit">Unmark</button>
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</form>
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{% endif %}
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<form action="/delete/{{ id }}" method="post" style="display:inline">
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<button type="submit">Delete</button>
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</form>
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</li>
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{% endfor %}
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</ul>
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</body>
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</html>
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"""
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@app.route('/')
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def index():
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conn = connection_pool.getconn()
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with conn.cursor() as cur:
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cur.execute("SELECT id, item, quantity, purchased FROM shopping_items ORDER BY purchased, id")
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items = cur.fetchall()
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connection_pool.putconn(conn)
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return render_template_string(HTML, items=items)
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@app.route('/add', methods=['POST'])
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def add_item():
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item = request.form['item']
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qty = int(request.form.get('quantity', 1))
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conn = connection_pool.getconn()
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with conn.cursor() as cur:
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cur.execute("INSERT INTO shopping_items (item, quantity) VALUES (%s, %s)", (item, qty))
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conn.commit()
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connection_pool.putconn(conn)
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return redirect(url_for('index'))
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@app.route('/toggle/<int:item_id>', methods=['POST'])
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def toggle_item(item_id):
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conn = connection_pool.getconn()
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with conn.cursor() as cur:
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cur.execute("UPDATE shopping_items SET purchased=NOT purchased WHERE id=%s", (item_id,))
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conn.commit()
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connection_pool.putconn(conn)
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return redirect(url_for('index'))
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@app.route('/delete/<int:item_id>', methods=['POST'])
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def delete_item(item_id):
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conn = connection_pool.getconn()
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with conn.cursor() as cur:
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cur.execute("DELETE FROM shopping_items WHERE id=%s", (item_id,))
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conn.commit()
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connection_pool.putconn(conn)
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return redirect(url_for('index'))
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if __name__ == '__main__':
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app.run(host='0.0.0.0', port=5000)
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z2/deployment.yaml
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z2/deployment.yaml
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apiVersion: apps/v1
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kind: Deployment
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metadata:
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name: web
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namespace: my-app
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spec:
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replicas: 2
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selector:
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matchLabels:
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app: web
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template:
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metadata:
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labels:
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app: web
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spec:
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initContainers:
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- name: wait-for-postgres
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image: busybox
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command:
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- sh
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- -c
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- |
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until nc -z postgres 5432; do
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echo "Waiting for PostgreSQL..."
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sleep 2
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done
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containers:
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- name: web
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# use the LOCAL image you just built, not the one on Docker Hub
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image: simple-web-app:latest
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imagePullPolicy: IfNotPresent
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ports:
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- containerPort: 5000
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env:
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- name: DB_HOST
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value: postgres
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- name: DB_PORT
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value: "5432"
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- name: DB_NAME
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value: postgres
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- name: DB_USER
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value: postgres
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- name: DB_PASS
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value: postgres
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readinessProbe:
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httpGet:
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path: /
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port: 5000
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initialDelaySeconds: 15
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periodSeconds: 10
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4
z2/namespace.yaml
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z2/namespace.yaml
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apiVersion: v1
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kind: Namespace
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metadata:
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name: my-app
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12
z2/persistent-storage.yaml
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z2/persistent-storage.yaml
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apiVersion: v1
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kind: PersistentVolumeClaim
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metadata:
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name: data-pvc
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namespace: my-app
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spec:
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accessModes:
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- ReadWriteOnce
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storageClassName: docker-desktop
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resources:
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requests:
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storage: 1Gi
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z2/postgres-deployment.yaml
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z2/postgres-deployment.yaml
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apiVersion: apps/v1
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kind: Deployment
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metadata:
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name: postgres
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namespace: my-app
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spec:
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replicas: 1
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selector:
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matchLabels:
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app: postgres
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template:
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metadata:
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labels:
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app: postgres
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spec:
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containers:
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- name: postgres
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image: postgres:14
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ports:
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- containerPort: 5432
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env:
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- name: POSTGRES_USER
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value: postgres
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- name: POSTGRES_PASSWORD
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value: postgres
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- name: POSTGRES_DB
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value: postgres
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volumeMounts:
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- name: postgres-storage
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mountPath: /var/lib/postgresql/data
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volumes:
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- name: postgres-storage
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emptyDir: {}
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z2/postgres-service.yaml
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z2/postgres-service.yaml
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apiVersion: v1
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kind: Service
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metadata:
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name: postgres
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namespace: my-app
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spec:
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selector:
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app: postgres
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ports:
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- port: 5432
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targetPort: 5432
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clusterIP: None
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11
z2/prepare-app.sh
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11
z2/prepare-app.sh
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#!/usr/bin/env bash
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# Prepare the environment: build Docker image
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set -e
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IMAGE_NAME="simple-web-app:latest"
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echo "Building Docker image ${IMAGE_NAME}..."
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docker build -t ${IMAGE_NAME} .
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echo "Preparation complete."
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4
z2/requirements.txt
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z2/requirements.txt
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Flask>=2.0.0
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Werkzeug>=2.0.0
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gunicorn>=20.1.0
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psycopg2-binary>=2.9.3
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z2/service.yaml
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z2/service.yaml
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apiVersion: v1
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kind: Service
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metadata:
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name: web
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namespace: my-app
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spec:
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type: NodePort
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selector:
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app: web
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ports:
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- port: 80
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targetPort: 5000
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nodePort: 30080
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29
z2/start-app.sh
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#!/usr/bin/env bash
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# Deploy the application to local Kubernetes
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set -e
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# Ensure kubectl uses the local Docker Desktop cluster
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kubectl config use-context docker-desktop
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NAMESPACE="my-app"
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echo "Creating namespace..."
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kubectl apply -f namespace.yaml
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# (optional) if you’ve switched to emptyDir for Postgres storage, skip PVC
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# echo "Creating PersistentVolumeClaim..."
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# kubectl apply -f persistent-storage.yaml
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echo "Deploying PostgreSQL..."
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kubectl apply -f postgres-deployment.yaml
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kubectl apply -f postgres-service.yaml
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echo "Waiting for PostgreSQL pod(s) to be ready..."
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kubectl wait --for=condition=ready pod -l app=postgres -n ${NAMESPACE} --timeout=120s
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echo "Deploying web application..."
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kubectl apply -f deployment.yaml
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kubectl apply -f service.yaml
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echo "Deployment complete. Access the app at http://localhost:30080"
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24
z2/stop-app.sh
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z2/stop-app.sh
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#!/usr/bin/env bash
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# Remove the application from local Kubernetes
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set -e
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kubectl config use-context docker-desktop
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NAMESPACE="my-app"
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echo "Deleting web application..."
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kubectl delete -f service.yaml -n ${NAMESPACE} --ignore-not-found
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kubectl delete -f deployment.yaml -n ${NAMESPACE} --ignore-not-found
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echo "Deleting PostgreSQL..."
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kubectl delete -f postgres-service.yaml -n ${NAMESPACE} --ignore-not-found
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kubectl delete -f postgres-deployment.yaml -n ${NAMESPACE} --ignore-not-found
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echo "Deleting storage..."
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kubectl delete -f persistent-storage.yaml -n ${NAMESPACE} --ignore-not-found
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echo "Deleting namespace..."
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kubectl delete -f namespace.yaml --ignore-not-found
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echo "Cleanup complete."
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