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Module 9 · Protocols, Security, ObservabilityDay 09025 min

Chaos and Disaster Recovery

Rehearse failures so you don't learn them at 3 AM.

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Day 090

Chaos and Disaster Recovery

Primary region
service
Replication
edge
DR region
service
Signal path
Primary + DR with replication and runbook
Primary region
service
flow
Replication
edge
Replication
edge
flow
DR region
service
Memory hook

Chaos and Disaster Recovery: rehearse failures so you don't learn them at 3 am

Mental model

design for the day something breaks

Design lens

DR infrastructure is expensive.

Recall anchors
RPO/RTOChaos engineeringDR drills

Why it matters

Disaster recovery planning sets RPO (max data loss tolerated) and RTO (max downtime tolerated) and shapes backups, replication, and failover. Chaos engineering proactively injects failures to verify resilience.

Deep dive

RPO=15min usually means streaming replication or frequent snapshots.

RTO=1h forces automated failover and runbook discipline.

Chaos starts small: kill one pod weekly; grow into region-failure exercises.

Demo / scenario

Quarterly DR exercise.

  1. Simulate region failure.
  2. Promote DR region per runbook.
  3. Validate writes/reads/data parity.
  4. Score: hit RTO/RPO; capture findings.

Tradeoffs

  • DR infrastructure is expensive.
  • Drills are disruptive but cheaper than real outages.
  • Findings drive iteration; treat them as priority bugs.

Diagram

Primary region
Replication
DR region
Primary + DR with replication and runbook.

Mind map

Check yourself

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Sources & further reading

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