Failover manual process in Redis

Introduction

Failover helps keep your Redis service running by switching to a backup if the main one stops working.

When the main Redis server crashes or becomes unreachable.

During planned maintenance to switch to a backup server without downtime.

If you notice slow responses or errors from the current Redis master.

When you want to test your backup Redis server by making it the main one temporarily.

Syntax

Redis

redis-cli -h <replica-host> -p <replica-port> CLUSTER FAILOVER

Connect to the replica node you want to promote to master using its host and port.

This command is used in Redis Cluster setups to manually trigger failover.

Examples

This command triggers failover on the replica node at 127.0.0.1:7001, making it the new master.

Redis

redis-cli -h 127.0.0.1 -p 7001 CLUSTER FAILOVER

Manually promotes the specified replica node to master in the Redis cluster.

Redis

redis-cli -h 127.0.0.1 -p 7004 CLUSTER FAILOVER

Sample Program

This command manually triggers failover on the Redis cluster replica node at 127.0.0.1:7001.

Redis

redis-cli -h 127.0.0.1 -p 7001 CLUSTER FAILOVER

Important Notes

Manual failover should be done carefully to avoid data loss.

Make sure the node you promote has the latest data before failover.

Use Redis Cluster commands only if your setup is a Redis Cluster.

Summary

Failover switches Redis master to a backup to keep service running.

Use 'redis-cli -h -p CLUSTER FAILOVER' to trigger manual failover.

Always confirm the new master is ready to serve data.