All 7 Redis Sentinel & High Availability questions
More in Redis Sentinel & High Availability
What is Redis Sentinel, and what role does it play in providing high availability for a non clustered Redis setup? Why does Redis Sentinel recommend running at least three Sentinel instances rather than just one? How does an application discover the current primary Redis instance when using Sentinel, especially after a failover has occurred? What is the quorum setting in a Sentinel configuration, and how does it affect the decision to trigger a failover? How would you deploy Redis Sentinel across multiple data centers or availability zones to maximize resilience against a localized failure? What is the difference between using Redis Sentinel and using Redis Cluster for achieving high availability, and how would you decide between them?
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How do you check the current status of a Sentinel deployment to confirm it is properly monitoring your Redis primary and replicas?

Intermediate

Answer

You connect to any Sentinel instance using redis-cli and run the SENTINEL MASTERS command to see the currently monitored primary's status, or SENTINEL SLAVES to see the status of monitored replicas, confirming Sentinel has correctly discovered and is actively monitoring your entire Redis deployment as expected.
redis-cli -p 26379 sentinel masters
redis-cli -p 26379 sentinel slaves mymaster
Real-world example A database administrator verifies a newly deployed Sentinel setup by checking that it has correctly discovered both the primary and all expected replicas, confirming the monitoring configuration is working as intended before relying on it in production.

Common follow-ups: What port does Sentinel typically run on by default?;How do you check whether Sentinel currently believes the primary is healthy or in a failure state?

Redis Monitoring & Observability;Redis CLI & Basic Commands
All 7 Redis Sentinel & High Availability questions