title: Migrating and merging multiple standalone Redis instances into a new Redis cluster on AWS Elasticache
body: <p>Right now we have our data split between three standalone Redis instances, no clustering or sharding. We're switching from our current cloud service provider over to AWS and want to store all this data in a new Elasticache Redis cluster so we can scale horizontally.</p>
  <p>Unfortunately, the AWS-CLI tool for migrating does not work when the target instance is in clustered mode and I'm unable to manually use the <code>SLAVEOF</code> command in ElastiCache. It also looks like the dump.rdb files are only able to be imported when you first start up your redis-server or when first creating your new EC cluster.</p>
  <p>Any pointers on how to achieve this migration and merge process would be appreciated. Is there a way I can merge multiple dump.rdb files into one? Or somehow pipe each server's data to the configuration endpoint / master node one by one?</p>