Migrate Redis Data To Cluster

Question

We have a single Redis instance with a good amount of data (over 100GB). We also have an empty Redis Cluster with 6 nodes. What would be the best way to move all that data from the stand-alone instance to the Redis Cluster and make it distribute it evenly?

Answer 1

After some searching around, I came across a post detailing how to move data over to a cluster. It may take some time to move lots of data over but this is the best way I've seen so far.

You can read about it here: https://fnordig.de/2014/03/11/redis-cluster-with-pre-existing-data/

Answer 2

You could make it easier by using redis-rdb-tools and a cluster proxy programm like redis-cerberus after you dump data into an RDB file

rdb --command protocol RDB_FILE_PATH | nc PROXY_HOST PROXY_PORT

Piping an AOF file into a proxy maybe doesn't work somehow if the AOF file contains cross-slots commands like RPOPLPUSH (depending on the proxy's implementation). However if you are actually using this kind of commands, you are not supposed to use a cluster.