Utiliser Docker Compose : installer Docker, rédiger le compose, up/down, logs, premier stack Web+BD

Installer Compose et piloter un stack Web+Postgres avec up, down et logs.

Faire tourner Web et PostgreSQL en local sans guerre de versions sur l’hôte. Docker Compose décrit l’app multi-conteneurs dans docker-compose.yml et la pilote en une commande.

Pour Docker Compose installer docker-compose.yml up down logs web base de données : installer Docker+Compose, rédiger le compose, up/down, logs, valider Web+DB. Selon docs.docker.com.

Pour qui Compose

Installer Docker et le plugin Compose

1. 1

   macOS / Windows: Docker Desktop

   Download from https://docs.docker.com/desktop/ (Docker Hub download links redirect there). Install, start Docker Desktop, wait until the engine reports running. Compose V2 ships as docker compose.

2. 2

   Linux: Docker Engine + compose plugin

   Follow https://docs.docker.com/engine/install/ for your distro, then install the Compose plugin per https://docs.docker.com/compose/install/linux/ (package name often docker-compose-plugin).

3. 3

   Verify CLI

   Run docker --version and docker compose version. If only hyphenated docker-compose exists, prefer upgrading to the plugin; legacy binary behavior differs slightly.

4. 4

   Permissions (Linux)

   Without sudo, add your user to the docker group per official post-install steps, then log out/in. Do not chmod /var/run/docker.sock to world-writable.

Premier docker-compose.yml (Web + PostgreSQL)

Create a project folder with docker-compose.yml (filename also accepted: compose.yaml). Example: nginx on port 8080 and PostgreSQL 16 with a named volume:

services:
  web:
    image: nginx:alpine
    ports:
      - "8080:80"
    volumes:
      - ./html:/usr/share/nginx/html:ro
    depends_on:
      - db
  db:
    image: postgres:16-alpine
    environment:
      POSTGRES_USER: app
      POSTGRES_PASSWORD: devpass
      POSTGRES_DB: appdb
    volumes:
      - db_data:/var/lib/postgresql/data

volumes:
  db_data:

Put a simple html/index.html on the host. Never commit real passwords; use .env for local secrets and add .env to .gitignore (see Docker docs on env files).

Démarrer, arrêter, logs

Vérifier le stack Web + base

1. 1

   HTTP

   Open http://localhost:8080 — nginx should serve your index.html.

2. 2

   Database

   docker compose exec db psql -U app -d appdb -c '\dt' checks Postgres inside the container.

3. 3

   Rebuild after edits

   If you add a build: section later, use docker compose up -d --build.

Compose orchestrates containers on one Docker host; it is not a cloud substitute. Backups, TLS, and scaling live in platform-specific docs.

Stack local OK : tableau blanc ou voix via accueil wbroom — créer et rejoindre une salle.

Questions utiles