To force a Redis slave to sync with its master, you can use the
SLAVEOF command. This command makes a server a replica (or slave) of another server (the master), implementing a master-replica model.
If a Redis instance is already a replica of some master, and you want to force a new synchronization, you need to first break the existing replication and then re-establish it. Here's how you can do that:
In this script,
master_port should be replaced with the hostname and port number of your master Redis instance.
Please note, these commands will cause the current Redis instance to stop accepting write queries until the synchronization process completes. Additionally, if your data set is large, the synchronization may take a while.
Another way to force a resynchronization is by using the
DEBUG RELOAD command, which unloads and reloads the database again. However, this technique is not recommended for production environments as it blocks the server during the operation.
Remember to use these commands cautiously, especially in a production environment. Inappropriate use can lead to data loss or service interruption.