Multi Stage Dockerfile

Layer Optimization

• Organize commands to maximize layer caching
• Place commands that change frequently (like code changes) after commands that change less frequently (like dependency installation)
• Use .dockerignore to prevent unnecessary files from being included in the build context
• Combine related RUN commands with && to reduce layer count
• Consider using COPY --chown to set permissions in one step

Security Practices

• Avoid running containers as root - use USER instruction to specify a non-root user
• Remove build tools and unnecessary packages from the final image
• Scan the final image for vulnerabilities
• Set restrictive file permissions
• Use multi-stage builds to avoid including build secrets in the final image

Performance Considerations

• Use build arguments for configuration that might change between environments
• Leverage build cache efficiently by ordering layers from least to most frequently changing
• Consider parallelization in build steps when possible
• Set appropriate environment variables like NODE_ENV=production to optimize runtime behavior
• Use appropriate healthchecks for the application type with the HEALTHCHECK instruction