Online migration to ElastiCache
By using Online Migration, you can migrate your data from self-hosted open-source Redis OSS on Amazon EC2 to Amazon ElastiCache.
Note
Online migration is not supported to ElastiCache serverless caches or clusters running on the r6gd node type.
Overview
To migrate your data from open-source Redis OSS 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 self-hosted open-source Redis OSS on Amazon EC2 to ElastiCache for Redis OSS and not between ElastiCache for Redis OSS clusters.
Important
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 Redis OSS cluster-mode disabled, the migration process makes the primary node of
the ElastiCache for Redis OSS cluster a replica of your source Redis OSS primary. For Redis OSS cluster-mode enabled,
the migration process makes the primary node of each ElastiCache shard a replica of 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 OSS 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
Migration steps
The following topics outline the process for migrating your data:
