Redis Sentinel achieves high availability by coordinating work to monitor and manage Redis instances. Key tasks include: Monitoring instance election leader performs failover processing configuration changes Sentinels communicate via the Gossip protocol. For optimal collaboration, it is recommended to deploy at least three sentinel instances, select different hosts, and monitor them.
Redis Sentinels work together
Redis Sentinel is a high availability solution for monitoring and managing Redis instances, ensuring automatic failover and failure recovery in the event of failure.
Sentinels work together
Sentinel instance coordinates work to perform the following key tasks:
1. Monitor Redis instances
Sentinels monitor Redis instances by sending PING commands regularly. If the Sentinel cannot communicate with the instance, it marks the instance as a failure.
2. Election of leadership sentinel
In the presence of multiple sentinels, the sentinel will elect a leading sentinel. Leader Sentinel coordinates failover and configuration changes.
3. Failover
When a sentinel detects a failure, it initiates a failover process. Lead sentinel selects a new master node and promotes the replica to the master node.
4. Configuration changes
Leader Sentinel is responsible for handling configuration changes, such as adding or removing instances. It propagates changes to all sentinel instances, ensuring they have the latest cluster information.
Communication Protocol
Sentinels use the Gossip protocol to communicate. This protocol allows sentries to exchange information with each other and keep synchronized to the cluster state.
Deployment precautions
To achieve optimal sentinel collaboration, follow these best practices:
- Deploy at least three sentinel instances to ensure redundancy.
- Select different hosts for the Sentinel instance to reduce the risk of failure.
- Monitor sentinel instances and take action in the event of a failure.
The above is the detailed content of How did the Redis Sentinel cooperate. For more information, please follow other related articles on the PHP Chinese website!
Redis: Exploring Its Data Model and StructureApr 16, 2025 am 12:09 AMRedis's data model and structure include five main types: 1. String: used to store text or binary data, and supports atomic operations. 2. List: Ordered elements collection, suitable for queues and stacks. 3. Set: Unordered unique elements set, supporting set operation. 4. Ordered Set (SortedSet): A unique set of elements with scores, suitable for rankings. 5. Hash table (Hash): a collection of key-value pairs, suitable for storing objects.
Redis: Classifying Its Database ApproachApr 15, 2025 am 12:06 AMRedis's database methods include in-memory databases and key-value storage. 1) Redis stores data in memory, and reads and writes fast. 2) It uses key-value pairs to store data, supports complex data structures such as lists, collections, hash tables and ordered collections, suitable for caches and NoSQL databases.
Why Use Redis? Benefits and AdvantagesApr 14, 2025 am 12:07 AMRedis is a powerful database solution because it provides fast performance, rich data structures, high availability and scalability, persistence capabilities, and a wide range of ecosystem support. 1) Extremely fast performance: Redis's data is stored in memory and has extremely fast read and write speeds, suitable for high concurrency and low latency applications. 2) Rich data structure: supports multiple data types, such as lists, collections, etc., which are suitable for a variety of scenarios. 3) High availability and scalability: supports master-slave replication and cluster mode to achieve high availability and horizontal scalability. 4) Persistence and data security: Data persistence is achieved through RDB and AOF to ensure data integrity and reliability. 5) Wide ecosystem and community support: with a huge ecosystem and active community,
Understanding NoSQL: Key Features of RedisApr 13, 2025 am 12:17 AMKey features of Redis include speed, flexibility and rich data structure support. 1) Speed: Redis is an in-memory database, and read and write operations are almost instantaneous, suitable for cache and session management. 2) Flexibility: Supports multiple data structures, such as strings, lists, collections, etc., which are suitable for complex data processing. 3) Data structure support: provides strings, lists, collections, hash tables, etc., which are suitable for different business needs.
Redis: Identifying Its Primary FunctionApr 12, 2025 am 12:01 AMThe core function of Redis is a high-performance in-memory data storage and processing system. 1) High-speed data access: Redis stores data in memory and provides microsecond-level read and write speed. 2) Rich data structure: supports strings, lists, collections, etc., and adapts to a variety of application scenarios. 3) Persistence: Persist data to disk through RDB and AOF. 4) Publish subscription: Can be used in message queues or real-time communication systems.
Redis: A Guide to Popular Data StructuresApr 11, 2025 am 12:04 AMRedis supports a variety of data structures, including: 1. String, suitable for storing single-value data; 2. List, suitable for queues and stacks; 3. Set, used for storing non-duplicate data; 4. Ordered Set, suitable for ranking lists and priority queues; 5. Hash table, suitable for storing object or structured data.
How to implement redis counterApr 10, 2025 pm 10:21 PMRedis counter is a mechanism that uses Redis key-value pair storage to implement counting operations, including the following steps: creating counter keys, increasing counts, decreasing counts, resetting counts, and obtaining counts. The advantages of Redis counters include fast speed, high concurrency, durability and simplicity and ease of use. It can be used in scenarios such as user access counting, real-time metric tracking, game scores and rankings, and order processing counting.
How to use the redis command lineApr 10, 2025 pm 10:18 PMUse the Redis command line tool (redis-cli) to manage and operate Redis through the following steps: Connect to the server, specify the address and port. Send commands to the server using the command name and parameters. Use the HELP command to view help information for a specific command. Use the QUIT command to exit the command line tool.
Hot AI Tools
Undresser.AI Undress
AI-powered app for creating realistic nude photos
AI Clothes Remover
Online AI tool for removing clothes from photos.
Undress AI Tool
Undress images for free
Clothoff.io
AI clothes remover
AI Hentai Generator
Generate AI Hentai for free.
Hot Article
Hot Tools
SAP NetWeaver Server Adapter for Eclipse
Integrate Eclipse with SAP NetWeaver application server.
Dreamweaver CS6
Visual web development tools
Zend Studio 13.0.1
Powerful PHP integrated development environment
EditPlus Chinese cracked version
Small size, syntax highlighting, does not support code prompt function
MinGW - Minimalist GNU for Windows
This project is in the process of being migrated to osdn.net/projects/mingw, you can continue to follow us there. MinGW: A native Windows port of the GNU Compiler Collection (GCC), freely distributable import libraries and header files for building native Windows applications; includes extensions to the MSVC runtime to support C99 functionality. All MinGW software can run on 64-bit Windows platforms.
