Question: Does Redis support replication?

Answer

Yes, Redis does support replication. Replication allows the creation of multiple copies of data on different database servers, enhancing data availability and reliability.

In Redis, you can set up a replication feature in a master-slave mode. Here's how it works: The slave (also referred to as a replica) will be a perfect copy of the original master server, including the data it holds. When this configuration is in place, all changes made to the data in the master are automatically replicated to its slaves. This setup not only provides an excellent backup solution but also allows for read scalability by distributing read operations across multiple slaves.

Here is a basic example of how to set up a Redis replication:

# On the slave machine:
redis-cli SLAVEOF <master-ip> <master-port>

In this command, <master-ip> and <master-port> should be replaced with the IP address and the port of the master Redis server respectively.

If you want to stop the replication process, you can use the following command on the slave machine:

redis-cli SLAVEOF NO ONE

Remember that in general, it's recommended to use a managed service like AWS Elasticache or Google Cloud Memorystore, which handle these details for you.