Dockerfile Generator — Production-Ready Dockerfiles
Generate production-ready Dockerfiles for Node.js, Python, Go, Java, or PHP with multi-stage builds and non-root user options.
# Remember to add a .dockerignore file (node_modules, .git, .env, etc.) FROM node:20-alpine AS builder WORKDIR /app COPY package.json package-lock.json* yarn.lock* pnpm-lock.yaml* ./ RUN npm ci COPY . . ENV NODE_ENV=production RUN npm run build FROM node:20-alpine AS runner WORKDIR /app RUN apk add --no-cache curl ENV NODE_ENV=production COPY --from=builder /app/package.json ./ COPY --from=builder /app/node_modules ./node_modules COPY --from=builder /app/dist ./dist EXPOSE 3000 RUN addgroup -g 1001 -S app && adduser -S app -u 1001 -G app USER app HEALTHCHECK --interval=30s --timeout=5s --start-period=30s --retries=3 \ CMD curl -fsS http://127.0.0.1:3000/ || exit 1 CMD ["sh", "-c", "node dist/index.js 2>/dev/null || node index.js"]
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Frequently Asked Questions
Quick answers to common questions
What is a Dockerfile and what does it contain?+
A Dockerfile is a text file containing instructions to build a Docker container image. It specifies: the base image (FROM), working directory (WORKDIR), files to copy (COPY), commands to run during build (RUN), environment variables (ENV), exposed ports (EXPOSE), and the command to run when the container starts (CMD or ENTRYPOINT).
What is a multi-stage Docker build?+
Multi-stage builds use multiple FROM instructions in one Dockerfile. The first stage builds the application. The second stage copies only the built artifact into a minimal base image, producing smaller images.
Why should I run Docker containers as non-root?+
Running as root inside a container is a security risk. Best practice is to create a dedicated user and use USER before the CMD instruction.