Redis replication is a process in which the same data is stored on multiple Redis servers. The primary server, known as the master, performs all write operations while secondary servers, known as slaves, replicate the data of the master server.
In detail, here's how it works:
Here is a basic example of how you might set up replication in Redis:
In this example, the 'master_host' would be replaced with the IP address or hostname of the master machine. Port
6379 is the standard Redis port.
Keep in mind that Redis uses asynchronous replication: slaves do not need to acknowledge the reception of each write operation. In general, this results in high performance but at the risk of potential data loss if a master crashes before the slaves have had time to save the latest updates. However, Redis enables you to configure the number of slaves and the maximum lag between master and slave to mitigate this risk.