All 7 Redis Replication questions
More in Redis Replication
What is Redis replication, and how does it help improve availability and read scalability? What is replication lag, and what factors can cause a replica to fall noticeably behind its primary server? What is the difference between full resynchronization and partial resynchronization when a replica reconnects to its primary after a temporary disconnection? How do you check the current replication status and role of a specific Redis instance, whether it is acting as a primary or a replica? How would you design a read scaling strategy using multiple Redis replicas for an application with a very read heavy workload? What happens to a Redis Cluster's replicas during a failover event, and how does the cluster decide which replica gets promoted?
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How do you configure a Redis instance to become a replica of another Redis instance?

Beginner

Answer

You use the REPLICAOF command, specifying the hostname and port of the primary server you want to replicate from, either as a runtime command or as a configuration file setting, after which the replica automatically connects to the primary, performs an initial full synchronization, and then continuously receives ongoing updates.
REPLICAOF 192.168.1.10 6379
-- Or in redis.conf:
-- replicaof 192.168.1.10 6379
Real-world example A team sets up a new replica server by configuring it to replicate from their existing primary, watching it automatically synchronize the entire dataset before beginning to serve read traffic.

Common follow-ups: What happens during the initial full synchronization process?;How do you stop a replica from following its current primary?

Redis Sentinel & High Availability;Persistence (RDB/AOF)
All 7 Redis Replication questions