All 7 Redis Replication questions
More in Redis Replication
What is Redis replication, and how does it help improve availability and read scalability? How do you configure a Redis instance to become a replica of another Redis instance? 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 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 check the current replication status and role of a specific Redis instance, whether it is acting as a primary or a replica?

Intermediate

Answer

You use the INFO REPLICATION command, which shows whether the instance is currently acting as a master or a replica, lists any connected replicas if it is a master, or shows the primary it is following along with the current replication offset and lag if it is itself a replica.
redis-cli info replication
Real-world example A team troubleshooting a replication issue checks INFO REPLICATION on both servers, confirming the replica is correctly connected to the intended primary and identifying the current replication offset on each side.

Common follow-ups: What does the role field in this output actually indicate?;How do you interpret the master_repl_offset and slave_repl_offset values together?

Redis Monitoring & Observability;Redis CLI & Basic Commands
All 7 Redis Replication questions