ask-docker-expert

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Docker and Docker Compose optimization. Multi-stage builds, security, debugging.

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Sourcenavanithans/agent-skill-kit

Added on2026-02-16

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<critical_constraints> ❌ NO running as root → use

USER node

or create user ❌ NO unpinned base images →

node:18-alpine3.18

❌ NO hardcoded secrets → use .env files ✅ MUST use multi-stage builds for compiled/Node.js apps ✅ MUST use .dockerignore (exclude node_modules, .git) </critical_constraints>

<multi_stage_template>

dockerfile

# Build Stage
FROM node:18-alpine AS builder
WORKDIR /app
COPY package*.json ./
RUN npm ci
COPY . .
RUN npm run build

# Production Stage
FROM node:18-alpine
WORKDIR /app
COPY --from=builder /app/dist ./dist
COPY --from=builder /app/package.json ./
RUN npm install --production
USER node
CMD ["npm", "start"]

</multi_stage_template>

<layer_caching> Order: least → most frequently changed

Copy package.json, install deps
THEN copy source code </layer_caching>

<compose> - Use healthcheck for dependencies - Use .env for secrets - Version 3.8 if required </compose> <debugging> - Connectivity: `docker compose exec app curl db:5432` - Logs: `docker logs -f <container_id>` - Shell: `docker exec -it <container_id> /bin/sh` </debugging>

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