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Dockerfile Generation

Create Dockerfiles for containerized services.

When to Containerize

Include Exclude
APIs, microservices Static websites (use Static Web Apps)
Web apps (SSR) Azure Functions (native deploy)
Background workers Database services
Message processors Logic Apps

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:

Runtime Reference
Node.js/Express runtimes/nodejs.md