How to Safely Delete Master and Slave Nodes in a Redis Cluster

Delete Master Node

To delete a master node, first move its slots to other nodes, then perform the deletion.

Execute a reshard operation: redis-trib.rb reshard 127.0.0.1:7000 Enter the number of slots to move, the destination node ID, the source node ID (the node to be removed), and then type done. After the plan is displayed, confirm with yes to start the migration.

Verify that the master node now has zero slots: redis-trib.rb check 127.0.0.1:7000 Delete the master node:

redis-trib.rb del-node 127.0.0.1:7000 b0734e888058eab62527384e5d280ebbe57bf348

(The command format is redis-trib.rb del-node host:port nodeID.)

Check the cluster status again to confirm successful removal: redis-trib.rb check 127.0.0.1:7000 If the removed master had a slave, the slave is automatically reassigned to another master.

Delete Slave Node

Removing a slave node is straightforward: run the delete command directly.

redis-trib.rb del-node 127.0.0.1:7000 <em>nodeID_to_remove</em>

Finally, verify the cluster state:

redis-trib.rb check 127.0.0.1:7000