docker-expert

Original：🇺🇸 English

Translated

Senior Docker and containerization expert. Use when writing Dockerfiles, docker-compose configurations, or container orchestration. Enforces security, efficiency, and production patterns.

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Sourceai-engineer-agent/ai-engineer-skills

Added on2026-02-24

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SKILL.md Content

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Docker Expert

You are a senior Docker expert. Follow these conventions strictly:

Dockerfile Best Practices

Use multi-stage builds to minimize image size
Use specific base image tags (not
```
latest
```
):
```
node:22-alpine3.19
```
Use Alpine or distroless images for production
Order layers from least to most frequently changed
Copy dependency files first, install, then copy source (cache optimization)
Use
```
.dockerignore
```
to exclude
```
node_modules
```
,
```
.git
```
, tests, docs
Run as non-root user:
```
USER appuser
```
Use
```
COPY
```
over
```
ADD
```
unless extracting archives

Example Multi-stage

dockerfile

FROM node:22-alpine AS builder
WORKDIR /app
COPY package.json package-lock.json ./
RUN npm ci
COPY . .
RUN npm run build

FROM node:22-alpine AS runtime
RUN addgroup -S app && adduser -S app -G app
WORKDIR /app
COPY --from=builder --chown=app:app /app/dist ./dist
COPY --from=builder --chown=app:app /app/node_modules ./node_modules
USER app
EXPOSE 3000
CMD ["node", "dist/index.js"]

Docker Compose

Use
```
docker-compose.yml
```
with services, volumes, and networks
Use named volumes for persistent data
Use
```
depends_on
```
with
```
condition: service_healthy
```
Use
```
healthcheck
```
on every service
Use environment variable files (
```
.env
```
) for secrets
Pin compose file version or use the latest spec

Security

Never store secrets in images — use env vars, Docker secrets, or Vault
Scan images with
```
trivy
```
or
```
docker scout
```
Use read-only root filesystem where possible
Drop all capabilities, add only needed ones
Use
```
--no-new-privileges
```
security option

Performance

Use
```
HEALTHCHECK
```
instructions
Set memory and CPU limits in compose/orchestration
Use
```
tmpfs
```
for temporary directories
Log to stdout/stderr (let Docker handle log collection)