Generate Dockerfile

You are generating an optimized Dockerfile. Follow these steps:

1. Analyze the Application

Determine:

• Language and version (Node.js, Python, PHP, Go, Rust, etc.)
• Framework (Express, Django, Laravel, etc.)
• Build requirements
• Runtime dependencies
• Entry point

2. Consult Documentation

Read the documentation:

• skills/docker-docs/references/02-dockerfile.md for complete Dockerfile patterns

3. Apply Best Practices

Base Image Selection

• Use official images
• Prefer Alpine variants for smaller size
• Pin specific versions (not latest)

Multi-Stage Builds

# Build stage
FROM node:20-alpine AS builder
WORKDIR /app
COPY package*.json ./
RUN npm ci
COPY . .
RUN npm run build

# Production stage
FROM node:20-alpine AS production
WORKDIR /app
COPY --from=builder /app/dist ./dist
COPY --from=builder /app/node_modules ./node_modules
USER node
EXPOSE 3000
CMD ["node", "dist/index.js"]

Layer Optimization

• Copy dependency files first
• Install dependencies before copying source
• Use .dockerignore to exclude unnecessary files

Security

• Run as non-root user
• Don't store secrets in image
• Use multi-stage to exclude build tools

Health Check

HEALTHCHECK --interval=30s --timeout=10s --retries=3 \
  CMD curl -f http://localhost:3000/health || exit 1

4. Generate the Dockerfile

Create a production-ready Dockerfile with:

• Clear comments
• Optimized layer caching
• Security best practices
• Appropriate health check

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