What is Sentinel in Redis?

Sentinel in Redis is a monitoring and high availability management system for Redis clusters.

Main functions of Sentinel:

• Monitoring: constantly checks the status of the master and replicas.
• Automatic failover: if the master is unavailable, Sentinel selects a new replica to promote to master.
• Notifications: informs administrators or systems about failures.
• Client configuration: provides information about the current master for proper connection.

Sentinel operates as a distributed service, where multiple Sentinels coordinate actions to ensure high availability of the Redis cluster.