https://ai-blog.noorshomelab.dev/tags/cluster/Recent content in Cluster on AI VOIDHugoenFri, 07 Nov 2025 00:00:00 +0000https://ai-blog.noorshomelab.dev/redis-guide/high-availability-and-clustering/Fri, 07 Nov 2025 00:00:00 +0000https://ai-blog.noorshomelab.dev/redis-guide/high-availability-and-clustering/<p>In production environments, simply running a single Redis instance is often not enough. You need to ensure your Redis service is <strong>highly available</strong> (it remains operational even if a server fails) and <strong>scalable</strong> (it can handle increased load and data volume). Redis offers two primary solutions for these challenges: <strong>Redis Sentinel</strong> for high availability and <strong>Redis Cluster</strong> for horizontal scaling.</p> <p>This chapter will guide you through:</p> <ul> <li>The concepts of High Availability (HA) and how Redis achieves it.</li> <li><strong>Redis Sentinel</strong>: For automatic failover and monitoring of master-replica setups.</li> <li><strong>Redis Cluster</strong>: For sharding data across multiple nodes and providing both HA and linear scalability.</li> <li>Understanding the trade-offs and when to use each.</li> </ul> <h3 id="1-high-availability-with-redis-sentinel">1. High Availability with Redis Sentinel</h3> <p>Redis Sentinel is a distributed system that provides high availability for Redis. It continuously monitors your Redis instances (masters and replicas), and if a master goes down, it automatically promotes a replica to become the new master. Sentinel also reconfigures the other replicas to follow the new master and informs client applications about the change.</p>