Hosting Migration
Hosting migration is the process of moving a website's files, databases, and configuration from one hosting provider to another while minimizing downtime. The DNS component is the most critical operational step: reducing the [[ttl|TTL]] of your domain's [[a-record|A records]] (or CNAME records) to 60–300 seconds several days before the migration ensures that once the new server is ready and DNS is updated, cached lookups expire quickly worldwide. Failure to lower TTL in advance can result in hours of split traffic between old and new servers. After migration, [[reverse-dns|reverse DNS]] on the new IP should also be updated to support proper [[mail-server|email]] deliverability.
Example
Before migrating from shared hosting to a VPS, set your A record TTL to 60 seconds 48 hours in advance. On migration day, update DNS and your site propagates globally within minutes rather than hours.