This guide walks you through setting up Nginx as a reverse‑proxy and load balancer, configuring Keepalived for high availability, writing monitoring scripts, and testing the failover on a CentOS 8 environment with multiple web servers.
This article explains how Spring Cloud Ribbon provides client‑side load balancing, outlines its classification, core mechanisms, common algorithms, and shows step‑by‑step code to replace the default balancing rule in a Spring Boot microservice.
This guide explains why learning the classic Eureka service registry remains valuable, compares architectures with and without Eureka, and provides step‑by‑step code for both non‑clustered and clustered setups, including self‑protection mode, load‑balanced clients, and how to retrieve registration information via DiscoveryClient.
This tutorial walks through building a three‑node UCloud lab, installing ipvsadm, configuring NAT and TUNNEL load‑balancing modes with LVS, adjusting routing and ARP settings, and verifying the setup using ipvsadm commands and curl requests.
This article walks through a practical setup of LVS DR mode load balancing on four UCloud servers, covering network configuration, ARP tweaks, ipvsadm rules, VIP assignment, troubleshooting steps, and implementing high‑availability with Keepalived, complete with command examples and visual screenshots.
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.
This article explains how two computers locate each other on the Internet using IP, MAC, and port numbers, details the ARP protocol and routing table lookup, and then examines LVS load‑balancing mechanisms, comparing NAT and FULLNAT models and their packet‑translation processes.
This tutorial walks you through transforming a traditional LNMP stack into a containerized, load‑balanced, and highly available PHP website on UCloud Cube, covering environment refactoring, configuration and storage separation, ULB setup, and instance cloning.
This lesson explains the value and implementation of high‑availability systems, explores load‑balancing concepts, features, and scenarios—including health checks, session persistence, and scheduling algorithms—and introduces virtual IP solutions for robust cloud infrastructure.
This article explains how incorporating hosted‑cloud physical servers into UCloud's UK8S cluster enables seamless hybrid‑cloud operation by improving resource utilization during low‑traffic periods, simplifying network, storage, and load‑balancing configurations, and reducing the operational overhead of managing separate Kubernetes clusters.
This article details the discovery, analysis, and resolution of a DPDK bug that caused a zero‑byte IP fragment to fill transmission queues, leading to packet loss and tx‑hang in UCloud's high‑availability ULB4 load balancer, and shares the tools and lessons learned for future debugging.
This article explains how UCloud addresses IPv4 limitations by deploying a free IPv6 conversion service built on stateful NAT64 and programmable P4 switches, detailing the strategic rollout, system architecture, high‑availability and security mechanisms, load‑balancing algorithms, P4 table optimizations, and performance test results.
This article explains how to design custom routing rules, version‑based load balancing, and gray‑deployment strategies in distributed microservice systems to isolate service versions, ensure safe acceptance testing, and smoothly roll out new releases.
This article explains how to design custom routing strategies for versioned microservices, including default master branch routing, unified version routing, and service‑specific routing, and shows how to apply these rules to achieve gray deployments with load‑balancing and seamless version isolation.
A deep dive into a massive RocketMQ message backlog reveals that identical clientIds generated in Docker host‑mode cause load‑balancing errors, and the article explains the root cause, code analysis, and a practical fix by customizing the clientId.
This article walks through the evolution from a single‑Tomcat deployment to a multi‑layer load‑balancing architecture using Nginx, a gateway, LVS, and DNS, explaining static‑dynamic separation, high‑availability strategies, and performance trade‑offs for scalable backend systems.
This article explores the end‑to‑end design of a modern dating platform, covering requirement analysis, micro‑service architecture, gateway routing, sharded MySQL, CDN caching, matchmaking, recommendation scoring, high‑concurrency strategies, load balancing, database optimization, message queues, and spatial proximity algorithms such as grid, quadtree, and GeoHash.
This article explores comprehensive strategies for designing high‑concurrency systems, covering page staticization, CDN acceleration, caching layers, asynchronous processing, thread‑pool and MQ integration, sharding, connection pooling, read/write splitting, indexing, batch processing, clustering, load balancing, rate limiting, service degradation, failover, multi‑active deployment, stress testing, and monitoring.
This guide explains Traefik’s core concepts—EntryPoints, Routers, Middlewares, and Services—showing how to configure static and dynamic settings, apply routing rules, use built‑in middlewares, implement weighted load balancing, health checks, and failover, and deploy Traefik with Docker or Kubernetes.
After a massive message backlog in RocketMQ, the author discovered that identical clientIds generated by Docker containers using host network mode caused broker load‑balancing errors, leading to slow consumption; the article explains the root cause, code analysis, and how setting a unique clientId resolves the issue.