基于PHP的负载均衡技术的研究与改进

发布时间：2018-04-09 15:17

本文选题：负载均衡　切入点：Nginx　出处：《华东理工大学》2015年硕士论文

【摘要】：如今社会,互联网无处不在。人们对网络应用的强烈需求导致性能受到前所未有的挑战。在成本预算的制约下,很难去大批量地更换硬件基础设备来满足需求,此时,负载均衡便成为人们消除网络应用瓶颈的解决办法。本文首先介绍了负载均衡技术的发展现状和研究热点,关注常用的负载均衡实现方案和经典的负载均衡算法。然后通过对比分析市面上流行的两种负载均衡软件方案,结合工作经历阐述了本文采用Nginx作为负载均衡调度器的原因。在剖析Nginx内置加权轮询算法,并深入挖掘大访问大并发的性能瓶颈后,本文在其算法的基础之上提出一种动态调节连接数的负载均衡算法。具体来说就是能够根据集群系统中后台的具体服务器的整体性能水平和实时负载情况合理地分配用户的连接请求,使得整个集群系统达到一种稳定状态。接着通过多款测试工具做性能测试验证改进算法的有效性。在本文的最后,提出本次研究的改进之处,分析了其中的不足,并对以后的负载方面的研究方向进行了展望。
[Abstract]:Nowadays, the Internet is everywhere.The strong demand for network applications leads to unprecedented performance challenges.Under the constraint of cost budget, it is difficult to replace the hardware infrastructure in large quantities to meet the demand. At this time, load balancing becomes the solution to eliminate the bottleneck of network application.Firstly, this paper introduces the status quo and research focus of load balancing technology, and pays attention to the commonly used load balancing schemes and classical load balancing algorithms.Then, by comparing and analyzing two popular load balancing software schemes in the market, combined with the work experience, this paper explains the reason why Nginx is used as the load balancing scheduler in this paper.After analyzing the Nginx built-in weighted polling algorithm and digging into the performance bottleneck of large access and concurrency, this paper proposes a load balancing algorithm which dynamically adjusts the number of connections based on its algorithm.Specifically, the connection requests of users can be reasonably allocated according to the overall performance level and real-time load of the specific servers in the cluster system, so that the whole cluster system can reach a stable state.Then the effectiveness of the improved algorithm is verified by performance testing with several testing tools.At the end of this paper, the improvement of this research is put forward, the deficiency is analyzed, and the research direction of load in the future is prospected.
【学位授予单位】：华东理工大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TP393.05

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