Horizontal scaling changes application processing capacity by adding or removing application instances. Deployment planning should match this capability to expected traffic and operational needs. section 9.6.2
A traffic-based deployment checklist pairs simple horizontal scaling with supporting operational practices:
- For applications handling fewer than 10,000 requests per day, make it easy to add instances when load increases. section 9.6.2
- Support scaling with basic monitoring and alerting, standard security measures, daily backups, and basic error tracking. section 9.6.2
- Reassess infrastructure as traffic grows toward 10,000–100,000 requests per day, adding CDN, security, logging, and error-tracking capabilities. section 9.6.2
Small-scale deployment
A low-traffic application can begin with basic monitoring and a straightforward mechanism for adding application instances. This provides additional capacity without requiring the full infrastructure used at higher traffic tiers. section 9.6.2
