SLAVEOF · Valkey

SLAVEOF

Sets a server as a replica of another, or promotes it to being a primary.

Usage

SLAVEOF host port
SLAVEOF NO ONE

Description

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.

Reply

Simple string reply: OK.

Complexity

O(1)

ACL Categories

@admin @dangerous @slow

History

See also

ACL, ACL CAT, ACL DELUSER, ACL DRYRUN, ACL GENPASS, ACL GETUSER, ACL HELP, ACL LIST, ACL LOAD, ACL LOG, ACL SAVE, ACL SETUSER, ACL USERS, ACL WHOAMI, BGREWRITEAOF, BGSAVE, COMMAND, COMMAND COUNT, COMMAND DOCS, COMMAND GETKEYS, COMMAND GETKEYSANDFLAGS, COMMAND HELP, COMMAND INFO, COMMAND LIST, CONFIG, CONFIG GET, CONFIG HELP, CONFIG RESETSTAT, CONFIG REWRITE, CONFIG SET, DBSIZE, DEBUG, FAILOVER, FLUSHALL, FLUSHDB, INFO, LASTSAVE, LATENCY, LATENCY DOCTOR, LATENCY GRAPH, LATENCY HELP, LATENCY HISTOGRAM, LATENCY HISTORY, LATENCY LATEST, LATENCY RESET, LOLWUT, MEMORY, MEMORY DOCTOR, MEMORY HELP, MEMORY MALLOC-STATS, MEMORY PURGE, MEMORY STATS, MEMORY USAGE, MODULE, MODULE HELP, MODULE LIST, MODULE LOAD, MODULE LOADEX, MODULE UNLOAD, MONITOR, PSYNC, REPLCONF, REPLICAOF, RESTORE-ASKING, ROLE, SAVE, SHUTDOWN, SLOWLOG, SLOWLOG GET, SLOWLOG HELP, SLOWLOG LEN, SLOWLOG RESET, SWAPDB, SYNC, TIME.