docker-patternslisted
Install: claude install-skill Tibsfox/gsd-skill-creator
# Docker Patterns
Best practices for building secure, efficient, and production-ready Docker images and compositions.
## Multi-Stage Builds
Multi-stage builds separate build dependencies from runtime, producing smaller and more secure images.
### Node.js / TypeScript
```dockerfile
# Stage 1: Install dependencies
FROM node:20-alpine AS deps
WORKDIR /app
COPY package.json package-lock.json ./
RUN npm ci --ignore-scripts
# Stage 2: Build
FROM node:20-alpine AS build
WORKDIR /app
COPY --from=deps /app/node_modules ./node_modules
COPY . .
RUN npm run build
RUN npm prune --production
# Stage 3: Production
FROM node:20-alpine AS production
WORKDIR /app
RUN addgroup -g 1001 appgroup && \
adduser -u 1001 -G appgroup -s /bin/sh -D appuser
COPY --from=build --chown=appuser:appgroup /app/dist ./dist
COPY --from=build --chown=appuser:appgroup /app/node_modules ./node_modules
COPY --from=build --chown=appuser:appgroup /app/package.json ./
USER appuser
EXPOSE 3000
HEALTHCHECK --interval=30s --timeout=3s --start-period=5s --retries=3 \
CMD wget --no-verbose --tries=1 --spider http://localhost:3000/health || exit 1
CMD ["node", "dist/index.js"]
```
### Python
```dockerfile
# Stage 1: Build
FROM python:3.12-slim AS build
WORKDIR /app
RUN python -m venv /opt/venv
ENV PATH="/opt/venv/bin:$PATH"
COPY requirements.txt .
RUN pip install --no-cache-dir -r requirements.txt
COPY . .
# Stage 2: Production
FROM python:3.12-slim AS production
WORKDIR /app
RUN groupadd -r appgroup