How to use Redis Sentinel mode?

The Redis Sentinel mode can be used to achieve high availability in a Redis architecture. Below are the steps for implementing the Redis Sentinel mode.

1. Configure master-slave replication: Set up master-slave replication in Redis to allow the master node to replicate data to one or more slave nodes, enabling data backup and failover.
2. Deploy Sentinel nodes: Deploy Sentinel nodes in the Redis cluster to monitor the status of master and slave nodes, automatically promoting a slave node to a new master node in case of failure of the current master node.
3. Set up sentinel nodes: Configure the relevant parameters for the sentinels on each sentinel node, including the monitored master node’s address, port, and other information.
4. Start sentinel nodes: By starting the sentinel nodes, they will automatically discover and monitor the status of the master and slave nodes.
5. Fault tolerance: When the primary node fails, the sentinel node will automatically elect a secondary node as the new primary node, and switch the other secondary nodes to the new primary node.
6. The client connects to the sentinel node to get the latest address of the master node and then directly connects to the master node for read and write operations.

By configuring and launching Redis Sentinel nodes, high availability for Redis can be achieved, ensuring automatic failover from the master node to the slave node in case of a failure, thus providing continuous and reliable service.