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#aws-rds

2 stories

Banner: RDS storage that autoscaled up after a backfill and cannot shrink back

Databases Bug Report

One backfill grew our RDS storage to 2 TB, and the bill stayed after cleanup

Ryan Pham · Apr 8, 2026 · 6 min read

A one-off data backfill filled our Postgres RDS instance, storage autoscaling grew it from 400 GB to 2 TB, and after we deleted the temporary tables the bill stayed. RDS allocated storage cannot be reduced in place. We shrank it with a blue/green switchover and capped autoscaling.

Banner: passwordless RDS IAM authentication failed after 15 minutes because the token was used as a static password

Databases Bug Report

Passwordless RDS IAM authentication failed after 15 minutes: the token was used as a static password

Le Minh Khoa · Nov 17, 2025 · 7 min read

We moved a service on EKS from a database password to RDS IAM authentication. It worked at startup, then new connections failed with PAM authentication failed 15 minutes later: the app generated one token at boot and used it as the pool's password. How we generate tokens per connection.