This article walks through implementing web high availability and static‑dynamic content separation using HAProxy combined with Keepalived, covering load‑balancing concepts, VRRP basics, step‑by‑step configuration of time sync, hostnames, SSH trust, installing required packages, and testing failover scenarios.
This article outlines a comprehensive distributed server cluster architecture for large‑scale websites, covering the evolution from simple three‑tier setups to high‑availability load‑balancing with HAProxy/Keepalived, Redis caching, NoSQL storage, and future distributed MySQL considerations.
This article explains the structure of HAProxy configuration files, detailing the five sections—global, defaults, frontend, backend, and listen—along with key directives such as daemon, maxconn, mode, timeouts, bind, and server, and shows how they work together to manage traffic and monitoring.
This guide walks you through installing HAProxy, configuring it to balance HTTP traffic between two Nginx instances on ports 8080 and 8081, and verifying the setup by repeatedly accessing a test page that alternates between the two backend servers.
HAProxy is an open‑source, high‑performance load‑balancing software that operates at both layer 4 (TCP) and layer 7 (HTTP), offering strong reliability, massive concurrency handling, flexible algorithms, and powerful monitoring, making it ideal for large‑scale web and database workloads.
Yelp’s infrastructure team tackled HAProxy’s reload‑induced packet loss by leveraging Linux’s plug qdisc and iptables to delay SYN packets during reloads, enabling zero‑downtime service updates and improving reliability despite the kernel’s brief binding window.
This article examines how load‑balancing technologies such as Nginx, LVS, and HAProxy are chosen according to website scale, outlines their respective strengths and weaknesses, and describes typical deployment stages from simple single‑point setups to complex multi‑layer architectures.
This article details a straightforward architecture built on HAProxy, PHP, Redis, and MySQL that reliably handles one billion weekly requests, explains the underlying hardware, monitoring setup, and provides practical lessons and future scaling strategies for high‑traffic web services.
