create-dockerfile

Create Dockerfile

Write a production-ready Dockerfile for general-purpose application projects.

When to Use

• Containerizing a Node.js, Python, Go, Rust, or Java application
• Creating a consistent build/runtime environment
• Preparing an application for cloud deployment or Docker Compose
• No existing Dockerfile in the project

Inputs

• Required: Project language and entry point (e.g., npm start, python app.py)
• Required: Dependency manifest (package.json, requirements.txt, go.mod, Cargo.toml, pom.xml)
• Optional: Target environment (development or production)
• Optional: Exposed ports

Procedure

Step 1: Choose Base Image

Language	Dev Image	Prod Image	Size
Node.js	node:22-bookworm	node:22-bookworm-slim	~200MB
Python	python:3.12-bookworm	python:3.12-slim-bookworm	~150MB
Go	golang:1.23-bookworm	gcr.io/distroless/static	~2MB
Rust	rust:1.82-bookworm	debian:bookworm-slim	~80MB
Java	eclipse-temurin:21-jdk	eclipse-temurin:21-jre	~200MB

Got: Select the slim/distroless variant for production images.

Step 2: Write Dockerfile (by language)

Node.js

FROM node:22-bookworm-slim

RUN groupadd -r appuser && useradd -r -g appuser -m appuser

WORKDIR /app

COPY package.json package-lock.json ./
RUN npm ci --omit=dev

COPY . .

USER appuser
EXPOSE 3000
CMD ["node", "src/index.js"]

Python

FROM python:3.12-slim-bookworm

RUN groupadd -r appuser && useradd -r -g appuser -m appuser

WORKDIR /app

COPY requirements.txt .
RUN pip install --no-cache-dir -r requirements.txt

COPY . .

USER appuser
EXPOSE 8000
CMD ["python", "app.py"]

Go

FROM golang:1.23-bookworm AS builder

WORKDIR /src
COPY go.mod go.sum ./
RUN go mod download
COPY . .
RUN CGO_ENABLED=0 go build -o /app/server ./cmd/server

FROM gcr.io/distroless/static
COPY --from=builder /app/server /server
EXPOSE 8080
ENTRYPOINT ["/server"]