| name | test-a-multiregion-web-failover |
| category | web |
| description | Test a multiregion web failover across routing, compute, state, identity, data, queues, storage, dependencies, observability, recovery, and reconciliation. Use when regional resilience claims need controlled evidence. |
test-a-multiregion-web-failover
When to use
- Use before launch, after architecture change, during resilience exercises, or to validate recovery objectives.
- Do not inject failure without approved blast radius, stop authority, customer protection, and restoration criteria.
Procedure
- Define user journeys, regions, failure modes, RTO, RPO, correctness invariants, exclusions, observers, and abort thresholds.
- Map DNS, load balancing, edge, compute, sessions, identity, databases, caches, queues, object storage, secrets, and third parties.
- Establish baseline health, replication position, backups, authority, synthetic users, telemetry, communications, and recovery ownership.
- Inject bounded loss of a region and observe detection, routing, stale traffic, session behavior, reads, writes, jobs, and external effects.
- Verify no split authority, duplicate action, lost acknowledgement, security regression, privacy breach, or inaccessible degraded path.
- Restore deliberately, reconcile data and effects, drain stale work, validate caches, and prevent old-region resurrection.
- Compare results to objectives, record gaps and owners, update runbooks, and schedule an evidence-backed retest.
Failure plan
- Abort at the agreed threshold, return authority to the last verified topology, protect users, and reconcile every accepted operation.
Worked example
A commerce site fails from one region while preserving order idempotency, payment state, account sessions, queue ownership, and accessible status.
Done
- A multiregion failover test plan records scope, topology, baseline, injection, authority, observations, recovery, and reconciliation
- Routing, state, session, security, dependency, RTO, RPO, business-outcome, restoration, and retest evidence verifies resilience
