Ihr Docker Image ist 5 GB groß? So bekommen Sie es auf 50 MB.

Schritt 1: Messen¶

docker images myapp docker history myapp:latest

Schritt 2: Alpine Base¶

FROM node:20 → 1.1 GB¶

FROM node:20-alpine # → 180 MB

Schritt 3: Multi-Stage Build¶

FROM node:20-alpine AS build WORKDIR /app COPY package*.json ./ RUN npm ci –production COPY . . RUN npm run build

FROM node:20-alpine COPY –from=build /app/dist ./dist COPY –from=build /app/node_modules ./node_modules CMD [“node”, “dist/index.js”]

Schritt 4: Distroless¶

FROM gcr.io/distroless/nodejs20-debian12 COPY –from=build /app/dist /app CMD [“/app/index.js”]

Schritt 5: .dockerignore¶

node_modules .git *.md Dockerfile tests

Schritt 6: Layer minimieren¶

RUN apt-get update && apt-get install -y curl && rm -rf /var/lib/apt/lists/*

Ergebnisse¶

• node:20 = 1.1 GB
• node:20-alpine = 180 MB
• Multi-stage + Alpine = 80 MB
• Distroless = 50 MB
• Go Static Binary + Scratch = 10 MB

Tipp¶

Kleineres Image = schnelleres Deploy, weniger Angriffsfläche, weniger Speicher. Lohnt sich immer.