Dockerfile Generation

Create Dockerfiles for containerized services.

When to Containerize

Templates by Language

Node.js

FROM node:22-slim
WORKDIR /app
COPY package*.json ./
RUN npm ci --only=production
COPY . .
EXPOSE 3000
CMD ["node", "index.js"]

Python

FROM python:3.13-slim
WORKDIR /app
COPY requirements.txt .
RUN pip install --no-cache-dir -r requirements.txt
COPY . .
EXPOSE 8000
CMD ["uvicorn", "main:app", "--host", "0.0.0.0", "--port", "8000"]

.NET

FROM mcr.microsoft.com/dotnet/aspnet:10.0 AS base
WORKDIR /app
EXPOSE 8080

FROM mcr.microsoft.com/dotnet/sdk:10.0 AS build
WORKDIR /src
COPY ["*.csproj", "./"]
RUN dotnet restore
COPY . .
RUN dotnet publish -c Release -o /app/publish

FROM base AS final
WORKDIR /app
COPY --from=build /app/publish .
ENTRYPOINT ["dotnet", "App.dll"]

Java

FROM eclipse-temurin:21-jdk-alpine AS build
WORKDIR /app
COPY . .
RUN ./mvnw package -DskipTests

FROM eclipse-temurin:21-jre-alpine
WORKDIR /app
COPY --from=build /app/target/*.jar app.jar
EXPOSE 8080
ENTRYPOINT ["java", "-jar", "app.jar"]

Go

FROM golang:1.22-alpine AS build
WORKDIR /app
COPY go.* ./
RUN go mod download
COPY . .
RUN CGO_ENABLED=0 go build -o main .

FROM alpine:latest
WORKDIR /app
COPY --from=build /app/main .
EXPOSE 8080
CMD ["./main"]

.dockerignore

.git
node_modules
__pycache__
*.pyc
.env
.azure

Best Practices

• Use slim/alpine base images
• Multi-stage builds for compiled languages
• Non-root user when possible
• Include health check endpoint in app

Runtime-Specific Configuration

For production settings specific to each runtime: