REPLICAOF
REPLICAOF <host port | NO ONE>
- Available since:
- 5.0.0
- Time complexity:
- O(1)
- ACL categories:
-
@admin
,@slow
,@dangerous
,
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.
Examples
> REPLICAOF NO ONE
"OK"
> REPLICAOF 127.0.0.1 6799
"OK"
RESP2/RESP3 Reply
Simple string reply:OK
.