Cluster Architecture and Prerequisites A high availability (HA) setup using DRBD and Heartbeat relies on block-level data replication and automated failover management. DRBD mirrors storage across networked nodes, functioning as a network-based RAID 1. Heartbeat monitors node health via network puls...
Overview Manual master-slave failover requires human entervention—stop the application, reconfigure a slave, update configuration files, and restart. This process is time-consuming and introduces service downtime. Redis Sentinel, introduced in version 2.8, provides an automated solution for this pro...
Schema Design and Performance Tuning Efficient relational schema design underpins every high-performance MySQL deployment. Engineers must balance normalization requirements against query patterns when defining entity structures. Table Structure Principles Design entities with precise data types that...
Prerequisites for Hadoop HA Configuration JDK (version used: JDK 1.8; configure JDK environment variables independently) ZooKeeper (version used: ZooKeeper 3.8.3) Hadoop (version used: Hadoop 3.3.6) Hadoop cluster configured with three nodes: master (primary), slave1 (secondary), slave2 (secondary)...
Keepalived is a software solution for achieving high availability in network services. It is primarily used to ensure service continuity and prevent single points of failure, commonly applied in load balancing and failover scenarios. Core Concepts of Keeepalived VRRP-Based Implementation: Keepalived...