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This article mainly explains "Redis Sentinel Mode explanation". Friends who are interested may wish to have a look at it. The method introduced in this paper is simple, fast and practical. Let's let the editor take you to learn "Redis Sentinel Mode explanation".

1. Sentinel is mainly to solve the problem of downtime in the master-slave replication architecture:

1. Slave Redis downtime: when the slave library is restarted in Redis, it will be automatically added to the master / slave architecture, and data synchronization will be completed automatically. After the Redis2.8 version, incremental replication is realized when the master slave is disconnected and recovered.

2. Master Redis outage: it is more complicated and requires the following two steps to complete: execute the SLAVEOF NO ONE command from the slave database, disconnect the master-slave relationship and promote the master database to continue service; after restarting the master database, execute the SLAVEOF command and set it as the slave database of other libraries, and the data can be updated.

Because this manual recovery process is actually troublesome and error-prone, so the sentinel function provided by Redis to solve the problem.

What is the Redis Sentinel? Redis-Sentinel is used to manage Redis clusters, and the system performs three tasks:

1. Monitoring: Sentinel will constantly check whether your master server and slave server are working properly.

2. Notification: when there is a problem with a monitored Redis server, Sentinel can send a notification to the administrator or other applications through API

3. Automatic failover (Automatic failover): when a master server does not work properly, Sentinel starts an automatic failover operation, which upgrades one of the slaves of the failed master server to the new master server and allows the other slave servers of the failed master server to replicate the new master server. When the client tries to connect to the failed primary server, the cluster also returns the address of the new primary server to the client, so that the cluster can use the new primary server instead of the failed server.

At this point, I believe you have a deeper understanding of the "Redis Sentinel Mode explanation". You might as well do it in practice. Here is the website, more related content can enter the relevant channels to inquire, follow us, continue to learn!

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