Why one cloud outage takes down half the Internet
Multi-region failover: how an app keeps working when its cloud region goes dark
An app can keep working while its whole cloud region is down. What multi-region failover needs to have ready before the region goes dark, and what it costs.
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1
Picture your ticket app with a second home. It runs in us-east-1 and also in us-east-2, in Ohio, and every ticket sold in Virginia is copied to Ohio a moment later.
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2
Rono's scanner reaches your app by its own name, and that name still gives an address in Virginia. Then, at 7:48 on that Monday morning, London time, your app in Virginia stops answering.
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