All 7 Clustering questions
More in Clustering
What is the difference between a master node and a replica node within a Redis Cluster? How does Redis Cluster automatically handle failover when a master node becomes unavailable? What are the key limitations of Redis Cluster that developers should be aware of compared to a single instance Redis setup? How do you monitor the overall health and status of a Redis Cluster to catch problems before they affect your application? How would you design a Redis Cluster deployment to properly balance high availability, performance, and cost for a large scale production application? What is a split brain scenario in the context of Redis Cluster, and how does the cluster protect against it?
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Redis › Clustering

What is Redis Cluster, and what problem does it solve compared to running a single Redis instance?

Beginner

Answer

Redis Cluster is a way to run Redis across multiple connected nodes that automatically share data between them, solving the problem of a single Redis instance being limited by one server's available memory and processing power, letting you scale out horizontally as your data and traffic grow.
-- A minimal cluster requires at least three master nodes
redis-cli --cluster create node1:6379 node2:6379 node3:6379 --cluster-replicas 0
Real-world example A growing application that outgrows a single Redis server's memory capacity moves to Redis Cluster, spreading its data across several servers that together can hold far more than any one machine alone.

Common follow-ups: What is the minimum number of nodes required to run a Redis Cluster?;Does Redis Cluster automatically handle failover if a node goes down?

Cluster Sharding & Hash Slots;Redis Sentinel & High Availability
All 7 Clustering questions