Docker for Developers
Demo Creator
@seed-creator · muallif
Why Containers?
Containers package an application with its exact runtime dependencies, eliminating the classic "works on my machine" problem. Every developer and every CI runner sees the same environment.
A Dockerfile is an executable specification of your runtime environment — version-controlled, reviewable, and reproducible.
Writing Lean Dockerfiles
Use multi-stage builds to keep the final image small. Build dependencies belong in an intermediate stage; only the compiled output and runtime dependencies land in the final layer.
Never copy .env files into images. Inject secrets at runtime via environment variables or secret mounts.
Layer Caching
Docker builds layers from top to bottom and caches each one. Copy package.json and lock files before copying source code so npm install is cached across code-only changes.
FROM node:24-alpine AS builderWORKDIR /appCOPY package*.json ./RUN npm ciCOPY . .RUN npm run build FROM node:24-alpineWORKDIR /appCOPY package*.json ./RUN npm ci --omit=devCOPY --from=builder /app/dist ./distCMD ["node", "dist/main"]
Copy manifests first — npm install is cached unless package.json or the lock file changes.
Docker Compose for Local Dev
Use Compose to run infrastructure (Postgres, Redis, S3-compatible storage) without installing them globally. Run the app on the host for fast feedback loops with hot reload.
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