Dragonfly is an in-memory datastore that can act as a drop-in replacement for Redis, offering hardware efficiency and reduced architectural complexity. Migration from Redis to Dragonfly can be achieved using techniques such as Snapshot and Restore, Replication, or custom solutions. However, these methods may involve downtime. To perform zero-downtime migration, Redis Sentinel can be utilized. By replicating data from Redis to Dragonfly and then failing over to Dragonfly using Redis Sentinel, the failover is automatic and without manual steps of stopping or reconfiguring the application.