Ravi Sir's Cards › AWS
Rehearse failover
This revision card explains Rehearse failover. It starts from the need that paper runbooks fail on game day. It describes health checks on user-visible /healthz; DNS failover with sane thresholds. The how-to section notes idempotency keys stop double-sell across regions. An example on the card is quarterly game day: promote, redrive, postmortem.
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What this card says
Why do we need it?
Paper runbooks fail on game day.
What is it?
Health checks on user-visible /healthz; DNS failover with sane thresholds.
health check
How to do it
Idempotency keys stop double-sell across regions.
idempotency
Example
Quarterly game day: promote, redrive, postmortem.