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Emeline Nerot 2025-04-16 14:46:09 +00:00
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z2/Dockerfile Normal file
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# Use the official Node.js 16 image as the base image
FROM node:16
# Install PostgreSQL client
RUN apt-get update && apt-get install -y postgresql-client
# Set the working directory
WORKDIR /usr/src/app
# Copy the package.json and package-lock.json files
COPY package*.json ./
# Install dependencies
RUN npm install
# Copy the rest of the application code
COPY . .
# Expose the port the app runs on
EXPOSE 3000
# Command to run the application
CMD ["node", "server.js"]

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# Web Application Deployment to Kubernetes
## Description
This project deploys a simple web application to Kubernetes using a Deployment, StatefulSet, Service, PersistentVolume, and PersistentVolumeClaim. The application is a basic Node.js server that serves a web page.
## Containers Used
- **web-app-container**: A container running a Node.js application.
## Kubernetes Objects
- **Namespace**: `my-namespace`
- **Deployment**: `web-app-deployment`
- **StatefulSet**: `web-app-statefulset`
- **Service**: `web-app-service`
- **PersistentVolume**: `pv-volume`
- **PersistentVolumeClaim**: `pvc-claim`
## Virtual Networks and Named Volumes
- The application uses a PersistentVolume and PersistentVolumeClaim to store data.
- The Service exposes the application on port 80.
## Container Configuration
- The Dockerfile builds a Node.js application and exposes port 8080.
- The Deployment and StatefulSet use the image `my-web-app:latest`.
## Instructions
### Prepare the Application
1. Run the `prepare-app.sh` script to build the Docker image and create the namespace and persistent volumes.
```bash
./prepare-app.sh

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z2/db-deployment.yaml Normal file
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apiVersion: apps/v1
kind: Deployment
metadata:
name: postgres-deployment
namespace: my-namespace
spec:
replicas: 1
selector:
matchLabels:
app: postgres
template:
metadata:
labels:
app: postgres
spec:
containers:
- name: postgres-container
image: postgres:latest
ports:
- containerPort: 5432
env:
- name: POSTGRES_DB
value: tododb
- name: POSTGRES_USER
value: postgres
- name: POSTGRES_PASSWORD
value: motdepasse

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z2/db-service.yaml Normal file
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apiVersion: v1
kind: Service
metadata:
name: postgres-service
namespace: my-namespace
spec:
selector:
app: postgres
ports:
- protocol: TCP
port: 5432
targetPort: 5432
type: ClusterIP

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z2/deployment.yaml Normal file
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apiVersion: apps/v1
kind: Deployment
metadata:
name: web-app-deployment
namespace: my-namespace
spec:
replicas: 3
selector:
matchLabels:
app: web-app
template:
metadata:
labels:
app: web-app
spec:
containers:
- name: web-app-container
image: elineen/todo-app:latest
ports:
- containerPort: 3000
env:
- name: DB_HOST
value: postgres-service
- name: DB_PORT
value: "5432"
- name: DB_USER
value: postgres
- name: DB_PASSWORD
value: motdepasse
- name: DB_NAME
value: tododb

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z2/namespace.yaml Normal file
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apiVersion: v1
kind: Namespace
metadata:
name: my-namespace

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z2/package-lock.json generated Normal file
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{
"name": "todo-app",
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}

14
z2/package.json Normal file
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{
"name": "todo-app",
"version": "1.0.0",
"description": "A simple todo application",
"main": "server.js",
"scripts": {
"start": "node server.js"
},
"dependencies": {
"express": "^4.17.1",
"pg": "^8.7.1"
}
}

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z2/prepare-app.sh Normal file
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#!/bin/bash
# Build the Docker image for the application
docker build -t elineen/todo-app:latest .
# Push the Docker image to Docker Hub
docker push elineen/todo-app:latest
# Create the namespace
kubectl apply -f namespace.yaml
# Apply the Database Deployment
kubectl apply -f db-deployment.yaml
# Apply the Database Service
kubectl apply -f db-service.yaml
# Apply the StatefulSet (which includes PersistentVolume and PersistentVolumeClaim)
kubectl apply -f statefulset.yaml

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z2/server.js Normal file
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const express = require('express');
const { Client } = require('pg');
const bodyParser = require('body-parser');
const path = require('path');
const app = express();
const port = 3000;
// Middleware
app.use(bodyParser.json());
app.use(express.static('public'));
// PostgreSQL config
const client = new Client({
host: process.env.DB_HOST,
port: process.env.DB_PORT,
user: process.env.DB_USER,
password: process.env.DB_PASSWORD,
database: process.env.DB_NAME
});
client.connect()
.then(() => {
console.log('Connected to PostgreSQL');
// Créer la table si elle n'existe pas
return client.query(`
CREATE TABLE IF NOT EXISTS todos (
id SERIAL PRIMARY KEY,
text VARCHAR(255) NOT NULL,
completed BOOLEAN DEFAULT false
);
`);
})
.then(() => console.log('Table ready'))
.catch(err => console.error('DB error:', err));
// Routes API
app.get('/api/todos', async (req, res) => {
try {
const result = await client.query('SELECT * FROM todos ORDER BY id DESC');
res.json(result.rows);
} catch (err) {
res.status(500).send('Error fetching todos');
}
});
app.post('/api/todos', async (req, res) => {
const { text } = req.body;
if (!text) return res.status(400).send('Missing todo text');
try {
await client.query('INSERT INTO todos (text) VALUES ($1)', [text]);
res.status(201).send('Todo added');
} catch (err) {
res.status(500).send('Error adding todo');
}
});
app.delete('/api/todos/:id', async (req, res) => {
const { id } = req.params;
try {
await client.query('DELETE FROM todos WHERE id = $1', [id]);
res.send('Todo deleted');
} catch (err) {
res.status(500).send('Error deleting todo');
}
});
// Lancer le serveur
app.listen(port, () => {
console.log(`Todo app listening at http://localhost:${port}`);
});

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z2/service.yaml Normal file
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apiVersion: v1
kind: Service
metadata:
name: web-app-service
namespace: my-namespace
spec:
type: NodePort
selector:
app: web-app
ports:
- protocol: TCP
port: 80
targetPort: 3000
nodePort: 30080 # Tu peux changer ce port si nécessaire (entre 30000–32767)

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z2/start-app.sh Normal file
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#!/bin/bash
# Create the Namespace
minikube kubectl -- create namespace my-namespace
# Apply the Deployment
minikube kubectl -- apply -f deployment.yaml
# Apply the Service
minikube kubectl -- apply -f service.yaml
# Apply the StatefulSet
minikube kubectl -- apply -f statefulset.yaml
# Apply the Database Deployment
kubectl apply -f db-deployment.yaml
# Apply the Database Service
kubectl apply -f db-service.yaml

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apiVersion: apps/v1
kind: StatefulSet
metadata:
name: web-app-statefulset
namespace: my-namespace
spec:
serviceName: "web-app-service"
replicas: 1
selector:
matchLabels:
app: web-app
template:
metadata:
labels:
app: web-app
spec:
containers:
- name: web-app-container
image: elineen/todo-app:latest
ports:
- containerPort: 3000
volumeMounts:
- name: pvc-storage
mountPath: /data
volumeClaimTemplates:
- metadata:
name: pvc-storage
spec:
accessModes: [ "ReadWriteOnce" ]
resources:
requests:
storage: 1Gi

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#!/bin/bash
# Delete the Deployment
kubectl delete -f deployment.yaml
# Delete the Service
kubectl delete -f service.yaml
# Delete the StatefulSet
kubectl delete -f statefulset.yaml
# Delete the Database Service
kubectl delete -f db-service.yaml
# Delete the Database Deployment
kubectl delete -f db-deployment.yaml
# Delete the namespace
kukubectl delete namespace my-namespace