Vaše Docker image má 5 GB? Tady je jak ji dostat na 50 MB.
Krok 1: Změřte¶
docker images myapp docker history myapp:latest
Krok 2: Alpine base¶
FROM node:20 → 1.1 GB¶
FROM node:20-alpine # → 180 MB
Krok 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”]
Krok 4: Distroless¶
FROM gcr.io/distroless/nodejs20-debian12 COPY –from=build /app/dist /app CMD [“/app/index.js”]
Krok 5: .dockerignore¶
node_modules .git *.md Dockerfile tests
Krok 6: Minimalizujte vrstvy¶
RUN apt-get update && apt-get install -y curl && rm -rf /var/lib/apt/lists/*
Výsledky¶
- node:20 = 1.1 GB
- node:20-alpine = 180 MB
- Multi-stage + alpine = 80 MB
- Distroless = 50 MB
- Go static binary + scratch = 10 MB
Tip¶
Menší image = rychlejší deploy, méně attack surface, méně storage. Vždy se vyplatí.
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