摘要:在Internet和Intranet上，随着客户机数量和密集性任务的增加，单个Web服务器受到处理能力的限制，很可能会成为网络访问的新瓶颈。Web服务器集群系统具备高可用性和负载均衡性，并且易于扩展，成为解决这一问题的最佳方法。本文对Web服务器集群的设计与实现方法作了一些研究和探讨的工作。首先对现有Web服务器集群系统的技术进行了分析，介绍了几个典型的集群系统，重点讨论了高可用性的工作原理和实现技术。Web集群中的每个服务器节点都拥有独立的软硬件资源，它们和调度器一起协同工作，对外构成一个单一系统映像。所有到达的Web请求都通过调度器被尽可能均匀的分配到各服务器节点，从而提高系统的总体吞吐率并减少用户的平均应答延迟。针对中小企业局域网内Web服务器集群系统的特点，本文提出了一种用纯软件方法实现Web高可用集群系统的方案。5326
关键词： Web服务器集群；负载均衡；高可用性；集群系统
SME web server high availability cluster solution design
Abstract:Along with the increase of users and browsing tasks in Internet and Intranet，the single Web cluster is likely to be the new bottleneck ofnetwork visiting for its limited capability．The web server cluster hasthe features of high availability，and load balancing，and scalability．So it becomes the best solution for the preceding problem．
This paper doessome research about the design and real ization of Small and Medium Enterprises web server clusters．First the paper analyses the technique of the existing web server Cluster system，,introduces some typical web cluster systems，and discusses the work’s theory and realization’s technique of highavailability and load balancing emphatically．request. Each node in a Web Cluster has its own software and hardware resources, working cooperatively with the switcher to provide a single system image to the outside. All coming requests are forwarded to server nodes by the switcher with the goal of load balancing among all nodes so that high overall throughput and low average response latency can be reached.This paper proposes a software method of establishing a web HA server Cluster system in Local AreaNetwork．
KEYWORDS：Web server Cluster;Load Balancing;High Availahility;Web Cluster System
目录
1 绪论 1
2 选题分析 4
2.1 课题背景 4
2.2 选课的意义 4
2.3 论文的研究内容 5
3 高可用集群领域内概念 6
3.1 Linux高可用集群概述 6
3.1.1 集群 6
3.1.2 高可用集群的定义 8
3.1.3 DRBD介绍 8
3.2 高可用集群(HA)的层次结构 9
3.3 系统的可行性分析和工作模式 10
3.4 需求分析 11
3.4.1 系统开发和运行环境 12 中小企业web服务器的高可用集群方案设计:http://www.751com.cn/jisuanji/lunwen_2317.html