Thank you, yari!
I'm using Redis with replication (slaveof directive) + Sentinel (for automatic failover).
It seems that NodeBB may not support this?
The problem is, that I need to be connected to the master, and it can be any one of the 3 nodes I'm running. It can change dynamically.
ioredis has support for sentinel: https://github.com/luin/ioredis#sentinel
Would it be possible to make this work somehow?