This article walks through building a simple, cost‑effective high‑availability solution for Nginx using Keepalived’s VRRP‑based VIP failover, covering environment setup, configuration of master and backup nodes, health‑check scripts, testing procedures, troubleshooting tips, and rollback steps.
This article explains why Nginx’s “master‑slave” term refers to a high‑availability setup, details the four‑layer architecture, shows a complete configuration example, and walks through the failover process using VIP and Keepalived.
In multi‑node OCP deployments, accessing monitoring data via the master node IP/VIP can trigger a 401 "invalid VIP" error, and this guide explains the root cause, how OCP validates source IPs, and provides two reliable methods to correct the source IP configuration.
This article walks through real‑world Oracle RAC failures caused by misconfigured VIP failover and SCAN IP load‑balancing, explains how to diagnose the symptoms, provides correct TAF and listener settings, and highlights essential configuration tips to ensure reliable high‑availability operation.
This article explains enterprise‑level traffic planning and transparent multi‑level routing, detailing the network request flow, front‑end and back‑end component pairings, load‑balancer (LB) architectures, default and dedicated routing rules, and the mapping relationships between VIP and RIP for both internal and public domain name resolution.
This article explains the end‑to‑end network request flow in enterprise systems, clarifies terminology such as VIP and RIP, compares front‑end and back‑end network component combinations, and details various load‑balancing approaches including default and dedicated rules, with practical diagrams and deployment recommendations.
The article explains various Redis high‑availability solutions—including Sentinel service discovery, VIP binding, keepalived VRRP, and proxy middleware—for both master‑slave and cluster architectures, and shows how clients can reliably locate the current master node after failover.
This article explains the limitations of NAT and FULLNAT load‑balancing models, introduces DR and TUN modes that let real servers reply directly to clients, and details the required ARP and loopback configurations to hide VIPs and reduce bottlenecks.
The article describes a bug where a user's VIP expiration date cannot exceed a specific day in 2038 because the MySQL INT column storing the timestamp reaches its maximum signed value, explaining the cause, impact, and the pragmatic decision to ignore the issue.
This guide walks through setting up a highly available Redis 3.0 master‑slave cluster with Sentinel and a floating VIP on AWS EC2, covering environment preparation, configuration files, scripts, service startup, and failover testing.
This guide walks through setting up a Redis high‑availability solution using master‑slave replication, Redis Sentinel for automatic failover, and a floating VIP to provide a stable endpoint, covering environment preparation, configuration files, firewall rules, testing, and client integration.
This guide demonstrates how to configure a highly available Redis deployment using master‑slave replication, Redis Sentinel for automatic failover, and virtual IP (VIP) migration, covering environment setup, configuration files, firewall adjustments, testing procedures, and client connection strategies.
This guide explains how to create a high‑availability PostgreSQL cluster on two hosts using streaming replication, automatic failover and failback, dual virtual IPs, heartbeat monitoring, and stress testing, with full configuration scripts and practical test results.
