TOPIC CLOUD
Multi-region & DR surviving a region outage
IN 10 SECONDS
Disaster Recovery (DR) models run across multiple geographic regions to survive full-datacenter outages. Strategies range from active-passive backup to active-active cross-region replication.
GOTCHA Cross-region data replication is bounded by physics. High latency makes active-active synchronous database writes impossible without slowing queries down.
HOW REGION DISASTER ROLLS OVER
01 Data replication databases write updates to active region and sync them to secondary region.
02 Total outage active region goes completely offline (e.g. AWS us-east-1 shuts down).
03 Promotion DR scripts promote secondary region database replica to primary status.
04 Route swap DNS route records point global load balancer to the secondary region endpoint.
POKE IT YOURSELF
aws rds describe-db-cluster-snapshots — list backups available for disaster recovery restoration
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