Learn how to remove slave in Redis Sentinel. Our Redis Support team is here to help you with your questions and concerns.

Redis Sentinel Remove Slave | Guide

When managing a Redis Sentinel setup, cases, where a slave needs to be removed from monitoring, can be tricky.

However, using the right approach can ensure the smooth operation of your Redis infrastructure. Today, we are going to take a look at different methods to remove a slave from Redis Sentinel monitoring.

Method 1: Adjusting Configuration

The easiest way to shut down a slave is by modifying its configuration to no longer function as a slave. We also need to change its listening port.

By doing so, the Sentinel instances won’t be able to locate it. Hence, we can use it without any issues.

However, while this method works, it’s not the most efficient solution.

Method 2: Introducing a New Sentinel Command

Alternatively, we can add a new command to Sentinel as seen below to resolve the issue:

SENTINEL REMOVESLAVE <name>

This command tells Sentinel to stop monitoring the specified slave.

We can also change the command to remove a slave as well. This will prevent Sentinel from continuously checking for a slave that is no longer needed, thereby optimizing resource utilization.

Method 3: Fully Resetting Sentinel Configuration

Another method involves fully resetting the Sentinel configuration as seen here:

`SENTINEL RESET <pattern>

This shuts down the Redis slave and removes the `slaveof` statement from the configuration, and sends a `SENTINEL RESET` command to each Sentinel instance.

With these steps, the slave is removed from monitoring. Hence, Sentinel instances no longer consider it as part of the replication setup.

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Conclusion

In brief, our Support Experts demonstrated how to remove a slave in Sentinel.