how to delete nodes from redis cluster?

Question

I google it and found two solution:

1. CLUSTER FORGET (http://redis.io/commands/cluster-forget)

2. redis-trib.rb del-node

I think CLUSTER FORGET" is the right way to do.

But I really want to know the details about redis-trib.rb del-node.

Can someone explain the difference between them?

Heterotypic

Answer 1

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.

Landlord

Answer 2

As of Redis 6.2.3

WARNING: redis-trib.rb is not longer available! You should use redis-cli instead.

All commands and features belonging to redis-trib.rb have been moved to redis-cli. In order to use them you should call redis-cli with the --cluster option followed by the subcommand name, arguments and options.

Use the following syntax: redis-cli --cluster SUBCOMMAND [ARGUMENTS] [OPTIONS]

Example: redis-cli --cluster info 127.0.0.1:6382

---

~$ redis-cli
127.0.0.1:6379> CLUSTER HELP
127.0.0.1:6379> CLUSTER NODES
127.0.0.1:6379> CLUSTER FORGET <node-id>

Thao

Answer 3

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.

Arabella

Answer 4

Per redis article you should use:

redis-cli --cluster del-node 127.0.0.1:7000

where the the first argument is one of your cluster nodes.

Check 'removing a node' in he following article:

https://redis.io/docs/manual/scaling/

Cryohydrate