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The Key
- Multi-region ≠ Multi-region Active-Active
- Scheduled replication
- Near real-time replication
- Master-replica
- Master-master
- Patterns
- Read local, write global
- Read local, write partitioned
- Write distributed and synchronize
- Read local, write local
- Synchronize afterward, race conditions may happen
The Takeaways
- You may not need multi-region active-active as it is complex and cost more
- backup & restore, pilot light, warm standby are simpler models
- Services have their built-in multi-region support
- S3 cross-region replication
- EBS snapshot cross-region copy
- DynamoDB global tables (multi-master)
- RDS cross-region replica
- VPC cross-region peering
- CloudFormation StackSets deploys to multiple accounts & regions
- Config rules aggregates configuration change from multiple accounts & regions
- Systems Manager
- automation takes actions in multiple accounts & regions
- inventory
- CloudWatch logs
- Route 53
- Latency based routing
- Geolocation based routing
- DNS failover
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