Dockerfile Generator

Generate optimized Dockerfiles for Node.js, Python, Go, and more with best practices.

  • 100% free
  • Private in browser
  • No signup
  • No watermarks

Dockerfile

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

# Production stage
FROM node:20-alpine
WORKDIR /app
RUN addgroup -S appgroup && adduser -S appuser -G appgroup
COPY --from=builder --chown=appuser:appgroup /app/dist ./dist
COPY --from=builder --chown=appuser:appgroup /app/node_modules ./node_modules
COPY --from=builder --chown=appuser:appgroup /app/package.json ./
USER appuser
EXPOSE 3000
CMD ["node", "dist/index.js"]

.dockerignore

node_modules
npm-debug.log
.env
dist
build
.git
.gitignore
Dockerfile
.dockerignore
coverage
.nyc_output

Docker Commands

docker build -t my-node-app .
docker run -p 3000:3000 my-node-app

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About Dockerfile Generator

Dockerfile Generator on TheToolss creates production-ready Dockerfiles with multi-stage builds, .dockerignore, and docker run commands.

How to use Dockerfile Generator

  1. Select your platform/language.
  2. Configure version and options.
  3. Copy the generated Dockerfile.

Key features

  • Node.js, Python, Go, Rust, Java, Nginx, Static
  • Multi-stage build support
  • Auto-generated .dockerignore
  • Docker run command
  • Production best practices

Frequently asked questions

What is a multi-stage build?
Multi-stage builds create smaller final images by separating build and runtime stages.
What do I need to enter?
Just Platform, Node Version, Python Version, Go Version and Port. Every field has a sensible default you can start from.
Is my data uploaded anywhere?
No. The calculation runs in your browser with JavaScript — nothing you type is sent to a server or stored.
Does it work on a phone?
Yes. The layout adapts to small screens and needs no app or signup.
Is Free Dockerfile Generator Online free?
Yes. Free Dockerfile Generator Online on TheToolss is free to use with no signup required for the core workflow.

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Free Dockerfile Generator Online | TheToolss