docker-patterns
Best practices for Docker containerization and multi-stage builds
Works with
---
name: docker-patterns
description: Best practices for Docker containerization and multi-stage builds
license: MIT
---
# Docker Containerization Patterns
Build efficient, secure Docker images using modern patterns.
## Multi-Stage Builds
Always use multi-stage builds to minimize image size:
```dockerfile
# Build stage
FROM node:20-alpine AS builder
WORKDIR /app
COPY package*.json ./
RUN npm ci --only=production
# Production stage
FROM node:20-alpine
WORKDIR /app
COPY --from=builder /app/node_modules ./node_modules
COPY . .
USER node
CMD ["node", "server.js"]
```
## Security Best Practices
1. Never run as root - use `USER` directive
2. Use specific version tags, not `latest`
3. Scan images with `docker scout` or Trivy
4. Use `.dockerignore` to exclude sensitive files
## Health Checks
```dockerfile
HEALTHCHECK --interval=30s --timeout=3s --start-period=5s --retries=3 \
CMD curl -f http://localhost:3000/health || exit 1
```
## Compose Patterns
```yaml
services:
app:
build:
context: .
target: production
environment:
- NODE_ENV=production
deploy:
resources:
limits:
memory: 512M
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