Docker Init: Generating Dockerfiles Automatically

Docker Init: Generating Dockerfiles Automatically

The docker init command scaffolds Docker configuration files for your project automatically. It detects your application type and generates optimized Dockerfiles, compose files, and .dockerignore files for your Breeze deployments.

Prerequisites

Ensure you have Docker Desktop or Docker Engine 25+ installed:

docker --version
# Docker version 25.0.0 or later required

Running Docker Init

Navigate to your project directory and run:

cd /home/user/myproject
docker init

The interactive wizard asks about your application:

• Application platform (Node.js, Python, Go, Rust, etc.)
• Application entrypoint
• Listening port

Generated Files

Docker init creates these files:

.
├── Dockerfile           # Multi-stage build optimized for production
├── compose.yaml         # Docker Compose configuration
├── .dockerignore        # Excludes unnecessary files
└── README.Docker.md     # Docker-specific documentation

Example Generated Dockerfile for Node.js

FROM node:20-alpine AS base
WORKDIR /app
COPY package*.json ./

FROM base AS deps
RUN npm ci --omit=dev

FROM base AS build
RUN npm ci
COPY . .
RUN npm run build

FROM base AS final
ENV NODE_ENV=production
COPY --from=deps /app/node_modules ./node_modules
COPY --from=build /app/dist ./dist
USER node
EXPOSE 3000
CMD ["node", "dist/server.js"]

Tips

• Review and customize the generated files for your specific needs
• The generated Dockerfile uses multi-stage builds for smaller images
• Add application-specific environment variables to the compose file
• Run docker compose up immediately after init to test