Dockerfile Generator

Generate production-ready Dockerfiles for any application. Supports Node.js, Python, Go, Java, Rust, PHP, and more with best practices built-in.

✨ Generated locally in your browser

Ready-to-Download Samples

Download pre-built sample files instantly. No configuration needed.

Node.js Minimal

200 B

Basic Node.js Dockerfile (~200 bytes)

Node.js

Node.js Multi-Stage

500 B

Production-optimized Node.js build (~500 bytes)

Node.js

Next.js Application

600 B

Optimized Next.js standalone build (~600 bytes)

Node.js

Python Minimal

250 B

Basic Python application Dockerfile (~250 bytes)

Python

Python FastAPI

400 B

FastAPI with uvicorn production setup (~400 bytes)

Python

Python Django

500 B

Django with gunicorn production setup (~500 bytes)

Python

Create Custom File

Configure your own file with custom settings and content

Template Selection

Choose a Dockerfile template for your project

Project Template

Select a pre-configured template or customize

Base Image

Configure the base Docker image

Base Image

Docker base image (e.g., node:20-alpine)

Working Directory

Container working directory

Build Configuration

Configure build steps

Use Multi-Stage Build

Install Command

Command to install dependencies

Build Command

Command to build the application

Runtime Configuration

Configure runtime settings

Exposed Port

Port the application listens on

Start Command

Command to start the application

Entrypoint

Container entrypoint (optional)

Security Options

Configure security best practices

Run as Non-Root User

Username

Name of the non-root user

Environment Variables

Configure environment variables

NODE_ENV

Node.js environment mode

Custom Environment Variables

Additional ENV statements (one per line: KEY=value)

Dockerfile Preview

dockerfile

Template Selection

Choose a Dockerfile template for your project

Project Template

Select a pre-configured template or customize

Base Image

Configure the base Docker image

Base Image

Docker base image (e.g., node:20-alpine)

Working Directory

Container working directory

Build Configuration

Configure build steps

Use Multi-Stage Build

Install Command

Command to install dependencies

Build Command

Command to build the application

Runtime Configuration

Configure runtime settings

Exposed Port

Port the application listens on

Start Command

Command to start the application

Entrypoint

Container entrypoint (optional)

Security Options

Configure security best practices

Run as Non-Root User

Username

Name of the non-root user

Environment Variables

Configure environment variables

NODE_ENV

Node.js environment mode

Custom Environment Variables

Additional ENV statements (one per line: KEY=value)

Create production-ready Dockerfiles for any technology stack. Our generator includes multi-stage builds, security best practices, and optimized layer caching.

What is a Dockerfile?

A Dockerfile is a script containing instructions to build a Docker container image. It defines the base image, installs dependencies, copies application code, and configures the runtime environment. Docker uses these instructions to create reproducible, portable containers.

Why Use Proper Dockerfiles?

✓

Ensure consistent deployments across all environments

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Create smaller production images with multi-stage builds

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Improve security by running as non-root users

✓

Speed up builds with optimized layer caching

✓

Separate build dependencies from runtime

✓

Follow industry best practices automatically

Common Use Cases

Containerizing Applications

Package Node.js, Python, Go, or Java applications into portable containers for consistent deployment.

Multi-Stage Builds

Create optimized production images by separating build tools from runtime, resulting in smaller images.

Microservices Deployment

Build containers for Kubernetes or Docker Swarm deployment with proper health checks and security.

CI/CD Pipelines

Create reproducible build artifacts for continuous integration and deployment workflows.

Generator Features

✦

16 pre-built templates for popular languages and frameworks

✦

Multi-stage build patterns for minimal production images

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Security best practices with non-root users

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Optimized layer caching for faster builds

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Framework-specific configurations (Next.js, Django, Laravel)

✦

Instant download with no server processing

How It Works

Configure

Customize your file settings using the form above

Preview

See your changes in real-time in the preview panel

Download

Download your file instantly - no signup required

Frequently Asked Questions

What is a Dockerfile?

A Dockerfile is a text file containing instructions to build a Docker container image. It specifies the base image, dependencies, application code, and runtime configuration needed to create a reproducible container environment.

What is a multi-stage Docker build?

Multi-stage builds use multiple FROM statements to create smaller production images. The build stage contains all build tools and dependencies, while the final stage only includes the compiled application, reducing image size significantly.

Why use Alpine-based Docker images?

Alpine Linux images are significantly smaller (5MB vs 900MB for Ubuntu) because they use musl libc and busybox. This reduces image size, download time, and attack surface while maintaining compatibility with most applications.

Should I run containers as root?

No, running containers as non-root users is a security best practice. Create a dedicated user in your Dockerfile and use the USER instruction to switch to that user before running your application.

How do I optimize Docker layer caching?

Order your Dockerfile instructions from least to most frequently changing. Copy package files and install dependencies before copying source code. This ensures npm install or pip install layers are cached unless dependencies change.

What is the difference between CMD and ENTRYPOINT?

ENTRYPOINT defines the main command that always runs. CMD provides default arguments that can be overridden at runtime. Use ENTRYPOINT for the main executable and CMD for default flags or commands.