We are using redis. We have two set of data. One set of data(Assume it is using the prefix redis:local: eg: redis:local:key1) is used by the main application and no need of replication.
Another set of data (Prefix redis:replicate: eg: redis:replicate:key2) is used by the main application and should be replicated to slave redis instances.
I have two questions.
Is it possible to configure redis to replicate only keys with prefix redis:replicate:?
If that is not possible, Is it possible to configure redis to replicate only one database? We will store the first set of data in database-0 and the second set of data in database-1. So we have to replicate only database-1.
Currenly, we are running two instances of redis to solve the issue.
Redis only supports replication of whole instances. Limiting replication to a key prefix or database is not possible.
Running two instances of Redis is simplest and reliable option. Another way would be to write a custom replication program which is difficult and failure prone in comparison.
There is also another question concerning replication of only one database: Replicate a single Redis database from an instance that has multiple databases