As of Redis version 5.0.0, this command is regarded as deprecated.
It can be replaced by
REPLICAOF when migrating or writing new code.
SLAVEOF <host port | NO ONE>
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A note about the word slave used in this man page and command name: starting with Redis version 5, if not for backward compatibility, the Redis project no longer uses the word slave. Please use the new command
REPLICAOF. The command
SLAVEOF will continue to work for backward compatibility.
SLAVEOF command can change the replication settings of a replica on the fly.
If a Redis server is already acting as replica, the command
SLAVEOF NO ONE will
turn off the replication, turning the Redis 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 master,
SLAVEOF hostname port will stop
the replication against the old server and start the synchronization against the
new one, discarding the old dataset.
SLAVEOF NO ONE will stop replication, turning the server into a
MASTER, but will not discard the replication.
So, if the old master stops working, it is possible to turn the replica into a
master and set the application to use this new master in read/write.
Later when the other Redis server is fixed, it can be reconfigured to work as a
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