daluu / redis-cp

Copy redis keys from one db to another

In operation, we may need to copy one redis db to another. rdb is an awesome mechanism but if you're migrating things in/out of services like ElastiCache. It's just not on-the-fly.

Other people suggested some good approaches. Here are some ready-to-use codes in python.

Common Usages

# copy redis1/db0 -> redis2/db0 (dryrun)
redis-cp.py redis1 redis2 --dryrun --verbose

# copy redis1/db3 ->redis2/db3 (dryrun)
redis-cp.py redis1 redis2 --dryrun --verbose --db 3

# copy redis1/db1 ->redis2/db3 (dryrun)
redis-cp.py redis1 redis2 --dryrun --verbose --sdb 1 --ddb 3

Advanced Usages

# running two redis servers locally (different port) for testing/develop
redis-cp.py redis1 redis2 --sport 6379 --dport 7777

# change batch size (default is 100, which is just a random pick)
redis-cp.py redis1 redis2 --batch 500