Redis Sentinel for High Availability

When using Redis replication, what happens if your master server suddenly fails? Your application might go down!

This is where Redis Sentinel comes in. It's designed to make your Redis deployments highly available by automatically handling master failures.

Redis Sentinel isn't just one process; it's a distributed system of Sentinel instances. Each Sentinel has three main jobs:

• Monitoring: Constantly checks if your master and replica instances are working correctly.
• Notification: Alerts system administrators or other computer programs when a monitored Redis instance goes wrong.
• Automatic Failover: If a master fails, Sentinel can start a failover process where a replica is promoted to master, and other replicas are reconfigured.