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How to switch the master and slave mode of redis

Daniel James Reed

Apr 10, 2025 pm 09:36 PM

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There are two methods for switching Redis master-slave mode: direct switching and Redis-Sentinel auxiliary switching. Direct switching requires manual operations, including deactivating the master server, syncing data, disassociating and connecting to new master nodes. Redis-Sentinel provides automatic switching, requiring additional configuration of Sentinel and failover elections. Both methods may cause short-term data unavailability during the switching period and should be backed up before the operation.

How to switch the master and slave mode of redis

How to switch between Redis master and slave mode

Switch directly

Deactivate the master server: temporarily stop the master server so that it cannot receive write operations.
Synchronize the data of the master node to the slave node: Use the BGSAVE or SAVE command to synchronize the data of the master node to the slave node.
Make the slave master: Use the SLAVEOF NO ONE command to disassociate the slave node from the master node, and then use the INFO command to obtain the address of the new master node.
Make the old master node a slave: Use the SLAVEOF command to connect the old master node to the new master node.

Redis-Sentinel Assisted Switching

Redis-Sentinel is a tool for Redis high availability, which can automatically complete master-slave switching.

Configure Sentinel: Install and configure Sentinel to monitor the master and slave cluster.
Deactivate the master server: Sentinel will automatically detect the master server failure and start failover.
Election of a new master node: Sentinel will elect a slave node from the cluster to become the new master node.
Slave node switching: Sentinel connects all other slave nodes to the new master node.

Notice:

Be sure to make a backup before performing any switching operations.
During the switchover, data may be temporarily unavailable.
Redis-Sentinel provides a smoother and more reliable switching experience, but requires additional configuration and maintenance.

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