DNS routing policies for active-passive failover
WHAT IT TESTS: applying DNS policies to failover. OUTLINE: a failover policy with health checks routes to primary and flips to secondary on failure; keep TTL low; pair with health checks not just policy.
WHAT IT TESTS: whether you can map DNS routing policies to a concrete HA topology. ANSWER OUTLINE: for active-passive, use a failover routing policy where the primary record is served while its health check passes and DNS flips to the secondary region when the check fails; keep the record TTL low so clients re-resolve quickly; health checks, not just the policy, drive the switch. Latency and geolocation policies suit active-active distribution, not strict failover.
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- #dns
- #high-availability
- #failover
- #route53
- #cloud
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