How would you migrate an existing DNS infrastructure to Amazon Route 53 while maintaining zero downtime?
To migrate an existing DNS infrastructure to Amazon Route 53 with zero downtime, follow these steps:
1. Create a hosted zone in Route 53 and note the assigned name servers.
2. Recreate your current DNS records in the new hosted zone, ensuring accuracy and consistency.
3. Lower the Time-to-Live (TTL) values on your current DNS provider for faster propagation during migration.
4. Update your domain registrar’s name server settings to point to the Route 53 name servers obtained in step 1.
5. Monitor both the old and new DNS providers to ensure queries are being resolved correctly by Route 53.
6. Once traffic is fully routed through Route 53, increase TTL values back to their original settings.
7. Remove the old DNS provider’s records after confirming successful migration.
