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🎞 ANIMATE · Mode 3 of 5 · +100 XP— Docker Containers
📋Base
⚙️Multi-Stage
🔄Security
✅Health
🎯 Next: Test →
Step 1 / 4
Speed
Base Image
node:20-alpine: minimal Linux base (~5MB) vs node:20 (~900MB)💡 Analogy
Like packing only the essentials vs moving your whole house.
Alpine Linux base image is tiny (~5MB). Combined with Node.js still much smaller than the full Debian-based node:20 image.
Console Output
> FROM node:20-alpine: 5MB base
> npm ci: 180MB node_modules layer (cached if no package.json changes)
> COPY .: 2MB app code layer
●Dockerfile
Base ImageL1–5
1# Multi-stage build — final image has no build tools
2FROM node:20-alpine AS builder
3WORKDIR /app
4COPY package*.json ./
5RUN npm ci --only=production  # install deps first (layer cache)
6COPY . .
7RUN npm run build
8 
9# Production stage: minimal image
10FROM node:20-alpine AS runner
11WORKDIR /app
12RUN addgroup --system --gid 1001 nodejs && \
13    adduser  --system --uid 1001 nextjs        # non-root user
14COPY --from=builder /app/.next/standalone ./
15COPY --from=builder /app/public ./public
16USER nextjs                    # never run as root
17EXPOSE 3000
18ENV NODE_ENV=production
19HEALTHCHECK --interval=30s --timeout=3s \
20  CMD wget -qO- http://localhost:3000/health || exit 1
21CMD ["node", "server.js"]
22 
23# Build: docker build -t myapp:1.0 .
24# Run:   docker run -p 3000:3000 --env-file .env myapp:1.0
25# Size:  ~150MB (vs ~800MB without multi-stage)
25 lines
Timeline — 4 Steps
Base Image
node:20-alpine: minimal Linux base (~5MB) vs node:20 (~900MB)💡 Analogy
Like packing only the essentials vs moving your whole house.
Alpine Linux base image is tiny (~5MB). Combined with Node.js still much smaller than the full Debian-based node:20 image.
Console Output
> FROM node:20-alpine: 5MB base
> npm ci: 180MB node_modules layer (cached if no package.json changes)
> COPY .: 2MB app code layer

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Discussion

node:20-alpine: minimal Linux base (~5MB) vs node:20 (~900MB)

💡 Analogy

Like packing only the essentials vs moving your whole house.

Alpine Linux base image is tiny (~5MB). Combined with Node.js still much smaller than the full Debian-based node:20 image.

Console Output

> FROM node:20-alpine: 5MB base
> npm ci: 180MB node_modules layer (cached if no package.json changes)
> COPY .: 2MB app code layer

node:20-alpine: minimal Linux base (~5MB) vs node:20 (~900MB)

💡 Analogy

Like packing only the essentials vs moving your whole house.

Alpine Linux base image is tiny (~5MB). Combined with Node.js still much smaller than the full Debian-based node:20 image.

Console Output

> FROM node:20-alpine: 5MB base
> npm ci: 180MB node_modules layer (cached if no package.json changes)
> COPY .: 2MB app code layer