To design a disaster recovery solution for a critical application, I use the Pilot Light Strategy for cost-effectiveness and Multi-Region Active-Passive Architecture for high availability.
- Data Layer:
- Use Amazon RDS with cross-region replication for the database.
- Enable S3 Cross-Region Replication (CRR) for object storage.
- Application Layer:
- Host the application on EC2 Auto Scaling Groups in the primary region and configure a smaller, warm standby in the secondary region.
- Failover:
- Use Route 53 to configure health checks and DNS failover to the secondary region.
- Testing:
- Automate disaster recovery tests using AWS Systems Manager Runbooks.