How to Set DNS TTLs Before a Cloud Migration Cutover

DNS changes are a common part of a cloud migration, but lowering the TTL at the last minute does not immediately clear records already cached by resolvers. Some clients also retain connections or ignore expected caching behavior.

Prepare the name change

Record current DNS values and TTLs, confirm authoritative nameservers, and decide how long the old service will remain available. Lower the TTL far enough in advance for the previous value to expire before cutover. Validate the new endpoint and certificate before switching customer traffic.

• Test resolution from multiple networks and resolvers.
• Monitor both old and new endpoints during transition.
• Define rollback conditions and restore the previous DNS value if needed.
• Keep data synchronization consistent while both endpoints may receive traffic.

Informatix Systems lists cloud migration and DNS related services. A migration plan can coordinate DNS, application, and data cutover. Contact Informatix Systems to plan a cloud migration change window.