Docker & Containerization for Cloud Applications: Multi-Stage Builds & Compose

By Cloud Infrastructure Guild • Intermediate • 24 min read • Updated 2026-09-13

What You Will Master in This Tutorial

Shrink container images from 1.2 GB down to under 85 MB using multi-stage build patterns
Enforce container security by creating and switching to unprivileged non-root users
Configure Docker Compose for multi-container stacks with Redis caches and PostgreSQL health checks
Implement layer caching optimizations to cut CI/CD build times by over 70%

DOCKERFILE

# Stage 1: Build & Compile
FROM node:22-alpine AS builder
WORKDIR /app
COPY package*.json ./
RUN npm ci
COPY . .
RUN npm run build

# Stage 2: Minimal Production Runtime
FROM node:22-alpine AS runner
WORKDIR /app
ENV NODE_ENV=production
# Create non-root security user
USER node
COPY --chown=node:node package*.json ./
RUN npm ci --only=production && npm cache clean --force
COPY --chown=node:node --from=builder /app/dist ./dist

EXPOSE 3000
CMD ["node", "dist/server.js"]

Frequently Asked Questions

Why use Alpine Linux over Debian-based images?

Alpine base images start at just 5 MB in size and have significantly fewer installed packages, dramatically reducing the attack surface for CVE vulnerabilities.