4.2 Using Redis-CLI with a Redis Cluster

When you use redis-cli to connect to a shard of a Redis Cluster, you are connected to that shard only, and cannot access data from other shards. If you try to access keys from the wrong shard, you will get a MOVED error.

There is a trick you can use with redis-cli so you don’t have to open connections to all the shards, but instead you let it do the connect and reconnect work for you. It’s the redis-cli cluster support mode, triggered by the -c switch:

$ redis-cli -p 7000 -c

When in cluster mode, if the client gets an (error) MOVED 15495 127.0.0.1:7002 error response from the shard it’s connected to, it will simply reconnect to the address returned in the error response, in this case 127.0.0.1:7002.

Now it’s your turn: use redis-cli cluster mode to connect to your cluster and try accessing keys in different shards. Observe the response messages.