Docker Best Practices for Node.js Applications

Docker containers provide consistent environments from development to production. Here's how to build efficient, secure Node.js containers.

.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

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

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.

Docker Best Practices for Node.js Applications

Multi-Stage Builds#

Optimized Layer Caching#

.dockerignore#

Security Hardening#

Environment Variables#

Development Setup#

Health Checks#

Logging#

Resource Limits#

Graceful Shutdown#

Best Practices#

Conclusion#

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