how to delete nodes from redis cluster?

redis-trib.rb is a ruby utility script that antirez (lead redis developer) built as a reference implementation of building administrative tools on top of the basic redis cluster commands.

Under the hood redis-trib uses CLUSTER FORGET to implement it's own administrative del-node command. https://github.com/antirez/redis/blob/unstable/src/redis-trib.rb#L1374

Redis-trib is a lot friendlier to work with. If you're doing CLUSTER FORGET you'd need to loop over and send that command to every other node in the system, while del-node will automate that process for you.

src/redis-trib.rb del-node 192.168.0.211:6379 650e3746968e6b7c7e357f06adbde5b3b92fcceb

Note:

• 192.168.0.211:6379 This is any node in the cluster
• 650e3746968e6b7c7e357f06adbde5b3b92fcceb this is the cluster ID of the node you want to remove. You can get the value of this ID from “cluster nodes” command.