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The `REPLICAOF` command can change the replication settings of a replica on the fly.
If a Redis server is already acting as replica, the command `REPLICAOF` NO ONE will turn off the replication, turning the Redis server into a MASTER. In the proper form `REPLICAOF` 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, `REPLICAOF` hostname port will stop the replication against the old server and start the synchronization against the new one, discarding the old dataset.
The form `REPLICAOF` 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 replica.
@return
@simple-string-reply
@examples
```
> REPLICAOF NO ONE
"OK"
> REPLICAOF 127.0.0.1 6799
"OK"
```
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