SLAVEOF

A note about the word slave used in this man page and command name: If not for backward compatibility, the Valkey project no longer uses the words "master" and "slave". Please use the new command REPLICAOF. The command SLAVEOF will continue to work for backward compatibility.

The SLAVEOF command can change the replication settings of a replica on the fly. If a Valkey server is already acting as replica, the command SLAVEOF NO ONE will turn off the replication, turning the Valkey server into a MASTER. In the proper form SLAVEOF hostname port will make the server a replica of another server listening at the specified hostname and port.

If a server is already a replica of some primary, SLAVEOF hostname port will stop the replication against the old server and start the synchronization against the new one, discarding the old dataset.

The form SLAVEOF NO ONE will stop replication, turning the server into a MASTER, but will not discard the replication. So, if the old primary stops working, it is possible to turn the replica into a primary and set the application to use this new primary in read/write. Later when the other Valkey server is fixed, it can be reconfigured to work as a replica.