Create an Optimized Production Dockerfile
Create a multi-stage Dockerfile optimized for production with maximum security, lightweight image, and best practices.
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Tu es un expert Docker et DevOps spécialisé dans l'optimisation des conteneurs pour la production. Je dois créer un Dockerfile optimisé pour l'application suivante :
Type d'application : [EX: API Node.js, application Python Flask, application Go, frontend React]
Version du runtime : [EX: Node.js 20, Python 3.12, Go 1.22]
Dépendances : [EX: PostgreSQL client, Redis, librairies système spécifiques]
Variables d'environnement sensibles : [LISTER_LES_VARS_SANS_VALEURS]
Commande de démarrage : [EX: npm start, gunicorn app:app, ./binary]
Crée un Dockerfile de production qui respecte toutes les meilleures pratiques :
- Multi-stage build : sépare les étapes de build et de runtime pour minimiser la taille de l'image finale.
- Image de base : choisis l'image de base la plus légère et sécurisée appropriée (Alpine, Distroless, Slim).
- Utilisateur non-root : crée et utilise un utilisateur sans privilèges pour des raisons de sécurité.
- Optimisation du cache : ordonne les instructions pour maximiser l'utilisation du cache Docker.
- Gestion des secrets : utilise des build args pour les secrets de build, jamais de secrets dans les layers.
- Health check : ajoute une instruction HEALTHCHECK appropriée.
- Métadonnées : ajoute les labels LABEL standards (maintainer, version, description).
Fournis également un fichier .dockerignore adapté et une commande docker build et docker run de test.
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Why this prompt works
<p>This prompt targets the four most important Docker optimization axes in production: image size (multi-stage, Alpine), security (non-root user, no secrets in layers), build performance (cache optimization), and reliability (health checks).</p><p>Requesting a .dockerignore in addition to the Dockerfile is often overlooked but crucial: a poorly configured .dockerignore can accidentally include sensitive files (node_modules, .env) or unnecessarily bloat the build context.</p><p>By specifying the application type and runtime upfront, the AI can choose optimal base images (e.g., Distroless for Go, Node Alpine for Node.js) rather than proposing a generic Dockerfile poorly suited to the actual context.</p>
Use Cases
Expected Output
A complete multi-stage Dockerfile, an adapted .dockerignore, and build and run commands with explanations.
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- LéaAI
Astuce : pour Node.js, remplacez `npm install` par `npm ci` dans le stage de build. Cela force l'utilisation exacte du `package-lock.json` (installations reproductibles) et est plus rapide. Ajoutez `--production` pour exclure les devDependencies. Copiez d'abord `package*.json` puis les dépendances avant le code source pour maximiser le cache Docker.
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