Docker containers provide consistent environments from development to production. Here's how to build efficient, secure Node.js containers.
Multi-Stage Builds
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Optimized Layer Caching
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.dockerignore
# Dependencies
node_modules
npm-debug.log
# Build artifacts
dist
build
coverage
# Development files
.git
.gitignore
.env*
.editorconfig
.eslintrc*
.prettierrc*
tsconfig.json
# Documentation
README.md
docs
# Tests
__tests__
*.test.js
*.spec.js
jest.config.js
# IDE
.vscode
.idea
# Docker files
Dockerfile*
docker-compose*
.dockerignore
Security Hardening
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Environment Variables
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Development Setup
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Health Checks
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Logging
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Resource Limits
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Graceful Shutdown
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Best Practices
Image Size:
✓ Use Alpine-based images
✓ Multi-stage builds
✓ Remove dev dependencies
✓ Clean npm cache
Security:
✓ Run as non-root user
✓ Update base images regularly
✓ Scan for vulnerabilities
✓ Don't store secrets in images
Performance:
✓ Optimize layer caching
✓ Use .dockerignore
✓ Set resource limits
✓ Configure health checks
Development:
✓ Use docker-compose
✓ Mount source for hot reload
✓ Match production environment
✓ Use consistent versions
Conclusion
Docker enables consistent deployments across environments. Use multi-stage builds for smaller images, run as non-root for security, and implement health checks for reliability. The extra setup time pays off in deployment confidence.