Dockerfile Generator

Generate optimized Dockerfiles for different languages and frameworks. Choose from various templates and customize them to your specific needs.

Configuration

1. Select Language/Framework

Node.js
Python
Go
Java
Ruby
PHP
Rust
Static Site

2. Build Type

Standard
Basic Dockerfile with conventional setup and moderate layer optimization.
Multi-stage
Advanced pattern with separate build and runtime stages for smaller final images.
Production
Highly optimized with security best practices for production environments.

3. Application Configuration

The command used to start your application

4. Optimizations

Base Image
Alpine
Slim
Full
Distroless
Caching Strategy
Basic
Advanced
BuildKit
Dockerfile
# Base image
FROM node:14-alpine

# Set working directory
WORKDIR /app

# Copy package.json and package-lock.json
COPY package*.json ./

# Install dependencies
RUN npm install

# Copy application code
COPY . .

# Expose the port the app runs on
EXPOSE 3000

# Command to run the application
CMD ["npm", "start"]
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Explanation
  • FROM node:14-alpine: Uses the lightweight Alpine Linux version of Node.js 14 to minimize image size.
  • WORKDIR /app: Sets the working directory to /app for subsequent instructions.
  • COPY package*.json ./: Copies package files first to leverage Docker's layer caching.
  • RUN npm install: Installs dependencies. This layer will be cached unless package files change.
  • COPY . .: Copies application code after installing dependencies for better caching.
  • EXPOSE 3000: Documents that the application listens on port 3000.
  • CMD ["npm", "start"]: Defines the command to run when the container starts.

Want to Learn More About Dockerfile Best Practices?

Check out our tutorials on building efficient Docker images, including multi-stage builds, layer optimization, and caching strategies.

Browse Tutorials