This document discusses gumi's use of AWS services like EC2, ELB, and RDS. Some key points: - Gumi migrated their infrastructure to AWS in 2011 and uses EC2 for app/web servers, ELB for load balancing, RDS for the database, and other services. - RDS provides a highly available and scalable database solution. Features like Multi-AZ and read replicas provide redundancy and performance. - Migrating t