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Engineering notes from production

Runbooks and lessons from systems we build and operate for clients in the US and Europe — written for the engineers and CTOs who have to make the same calls.

· AWS RDS · MySQL · Zero downtime

Zero-downtime MySQL 8.0 → 8.4 upgrades on RDS with Blue/Green deployments

The runbook we used to move production RDS MySQL 8.0 instances to 8.4 before Extended Support charges began: prechecks, parameter groups, a full bake, go/no-go and honest rollback options.