Generate production-ready Dockerfiles for Node.js, Python, Go, Java, and Nginx with multi-stage builds and optimized layer ordering.
# Build stage FROM node:20-alpine AS builder WORKDIR /app # Copy dependency manifests first to leverage Docker layer cache COPY package*.json ./ RUN npm ci COPY . . RUN npm run build # Production stage FROM node:20-alpine WORKDIR /app RUN addgroup -S appgroup && adduser -S appuser -G appgroup USER appuser COPY --from=builder /app/dist ./dist COPY --from=builder /app/node_modules ./node_modules ENV NODE_ENV=production EXPOSE 3000 CMD ["node", "dist/index.js"]
.git .gitignore *.md .env .env.* .DS_Store Thumbs.db node_modules npm-debug.log* .npm dist build coverage .nyc_output .eslintcache
A Dockerfile is a text file that defines how to build a container image. The order of instructions matters for cache efficiency: dependencies are installed before source code is copied so that Docker reuses the cached layer when only application code changes, not when dependencies do.
Choose a language and base image, optionally toggle multi-stage builds, set your build and start commands, and add any environment variables. The generator enforces best-practice layer ordering and creates a non-root user for security by default.
Multi-stage builds produce a smaller final image by separating the build environment from the runtime environment. The builder stage compiles the application, and only the compiled artifact is copied into the lean runtime stage. This is especially effective for Go and Java applications.