What are the different ways to build a Redis cluster?

There are several ways to set up a Redis cluster.

1. Master-slave replication: Setting up multiple Redis instances to have a master-slave relationship, where one instance serves as the master node, receiving write operations and replicating them to the slave node. The slave node can only perform read operations, ensuring consistency with the data on the master node through data replication.
2. Sentinel Mode: Based on master-slave replication, the Sentinel node monitoring system is introduced. The Sentinel node is responsible for monitoring the status of the master node. When the master node fails, it automatically switches the slave node to a new master node, ensuring high availability of the service.
3. Cluster Mode: Redis Cluster is the recommended cluster solution by the official, using sharding to automatically distribute data and handle failover. Each node in the cluster holds a portion of the data, and communication between nodes is ensured through the Gossip protocol for consistency and availability of data.
4. Third-party solutions: In addition to the official methods, there are also some third-party Redis cluster solutions, such as Twemproxy and Codis, which achieve data sharding and high availability through a proxy layer.