Stack Prometheus + Grafana : monitoring d'un serveur Ubuntu

# Clavier en AZERTY
sudo dpkg-reconfigure keyboard-configuration
sudo setupcon
sudo systemctl restart keyboard-setup.service

# Mise à jour du système
sudo apt update && sudo apt upgrade -y

# Création de l'utilisateur et ajout au groupe sudo
sudo adduser mug
sudo usermod -aG sudo mug

# Installation des services nécessaires
sudo apt install openssh-server nginx python3-pip -y
sudo systemctl status nginx

mkdir ~/scripts_supervision
cd ~/scripts_supervision

version: '3.8'

services:

  # Conteneur 1 : PROMETHEUS
  prometheus:
    image: prom/prometheus:latest
    container_name: prometheus
    ports:
      - "9090:9090"
    volumes:
      - ./prometheus/prometheus.yml:/etc/prometheus/prometheus.yml
    command:
      - --config.file=/etc/prometheus/prometheus.yml
      - --storage.tsdb.path=/prometheus
    restart: unless-stopped

  # Conteneur 2 : GRAFANA
  grafana:
    image: grafana/grafana:latest
    container_name: grafana
    ports:
      - "3000:3000"
    depends_on:
      - prometheus
    volumes:
      - grafana-storage:/var/lib/grafana
    restart: unless-stopped

volumes:
  grafana-storage:

docker-compose up -d

# Vérification — les deux conteneurs doivent afficher "Up"
docker ps

# prometheus/prometheus.yml
global:
  scrape_interval: 15s

scrape_configs:

  # 1. Prometheus s'auto-supervise
  - job_name: 'prometheus'
    static_configs:
      - targets: ['localhost:9090']

  # 2. Node Exporter — métriques système de la VM Ubuntu
  - job_name: 'ubuntu-nginx-server'
    static_configs:
      - targets: ['192.168.0.41:9100']
        labels:
          instance: 'mon-serveur-ubuntu'

  # 3. Exporter Python personnalisé — métriques logs Nginx
  - job_name: 'nginx-custom-exporter'
    static_configs:
      - targets: ['192.168.0.41:9101']
        labels:
          instance: 'python-log-counter'

# 1. Création de l'utilisateur système dédié (sans shell de connexion)
sudo groupadd --system node_exporter
sudo useradd -s /bin/false -r -g node_exporter node_exporter

# 2. Téléchargement de la dernière version stable
wget https://github.com/prometheus/node_exporter/releases/download/v1.10.2/node_exporter-1.10.2.linux-amd64.tar.gz

# 3. Extraction et installation du binaire
tar xvfz node_exporter-1.10.2.linux-amd64.tar.gz
sudo cp node_exporter-1.10.2.linux-amd64/node_exporter /usr/local/bin

# 4. Nettoyage des archives
rm -rf node_exporter-1.10.2.linux-amd64.tar.gz node_exporter-1.10.2.linux-amd64

# 5. Lancement (ou via service systemd)
/usr/local/bin/node_exporter &

# nginx_log_exporter.py — exemple de structure
from prometheus_client import start_http_server, Counter
import time, re

REQUEST_COUNT = Counter(
    'nginx_requests_total',
    'Nombre total de requêtes Nginx',
    ['method', 'status']
)

def parse_nginx_logs():
    log_pattern = re.compile(
        r'"(?P<method>\w+) .+ HTTP/\d\.\d" (?P<status>\d{3})'
    )
    with open('/var/log/nginx/access.log', 'r') as f:
        for line in f:
            m = log_pattern.search(line)
            if m:
                REQUEST_COUNT.labels(
                    method=m.group('method'),
                    status=m.group('status')
                ).inc()

if __name__ == '__main__':
    start_http_server(9101)
    while True:
        parse_nginx_logs()
        time.sleep(15)

# Installation de la librairie et lancement
pip3 install prometheus_client
python3 nginx_log_exporter.py &