Online migration to ElastiCache - Amazon ElastiCache for Redis

Online migration to ElastiCache

By using Online Migration, you can migrate your data from self-hosted Redis on Amazon EC2 to Amazon ElastiCache.


Online migration is not supported for clusters running on the r6gd node type.


To migrate your data from Redis running on Amazon EC2 to Amazon ElastiCache requires an existing or newly created Amazon ElastiCache deployment. The deployment must have a configuration that is ready for migration. It also should be in line with the configuration that you want, including attributes such as instance type, number of shards, and number of replicas.

Online migration is designed for data migration from hosted Redis on Amazon EC2 to ElastiCache for Redis and not between ElastiCache for Redis clusters.


We strongly recommend you read the following sections in their entirety before beginning the online migration process.

The migration begins when you call the StartMigration API operation or AWS CLI command. For non-Redis cluster, the migration process makes the primary node of the ElastiCache for Redis cluster a replica to your source Redis cluster. For Redis cluster, the migration process makes the primary node of each shard a replica to your source cluster's corresponding shard owning the same slots.

After the client-side changes are ready, call the CompleteMigration API operation. This API operation promotes your ElastiCache deployment to your primary Redis deployment with primary and replica nodes (as applicable). Now you can redirect your client application to start writing data to ElastiCache. Throughout the migration, you can check the status of replication by running the redis-cli INFO command on your Redis nodes and on the ElastiCache primary node.

Migration steps

The following topics outline the process for migrating your data: