Update Amazon RDS for MySQL database instance

Question

I want to know How to apply a new operating system (OS) update with critical security fixes update for Amazon RDS for MySQL database instance with little/no downtime?

database with multi-AZ :
in US-EAST-1 Region:
MySQL-cad-57-replica
MySQL-cad-57-rds
cad-DB-prod

Can someone suggest to me the best strategy to reduce the downtime?

Answer 1

Enable Multi-za (if you have not it already), Update your replica instances, and then go the main one. this will allow the fallback.