采用OpenFlow交换机的服务器负载均衡策略  

Server load balancing strategy using OpenFlow switch

作　　者：曾友雯 李双庆[1] 邹东升[1] ZENG Youwen;LI Shuangqing;ZOU Dongsheng(College of Computer Science,Chongqing University,Chongqing 400044,P.R.China)

机构地区：[1]重庆大学计算机学院,重庆400044

出　　处：《重庆大学学报》2021年第11期48-56,共9页Journal of Chongqing University

基　　金：国家自然科学基金资助项目(61309013)。

摘　　要：云数据中心对服务器的海量并发访问十分普遍。传统网络架构难以全局控制流量转发,需要配置昂贵的负载均衡器应对这一应用场景。软件定义网络SDN(software defined network)能够通过控制器全局掌控网络状态,并以交换机作为负载均衡器,从而降低部署成本。文中提出一种采用OpenFlow交换机的服务器负载均衡策略,通过多地址定向流表对服务请求进行分区映射,以活动连接数作为负载评估参数,通过蚁群算法求解最佳负载重定向方案。在负载迁移时,采用单地址定向流表来保证不同阶段流量的有序转发。实验结果显示,该策略能有效控制流表规模,并较传统均衡策略具有更优的性能。Massive concurrent access to servers is very common in cloud data centers.It is difficult for traditional network architecture to control traffic forwarding globally,and expensive load balancers are needed to deal with this application scenario.The SDN(software defined network)can globally control the network status through the controller,and use the switch as a load balancer,thereby reducing deployment costs.A server load balancing strategy based on OpenFlow switches was proposed in this paper.Service requests were partitioned and mapped through multi-address directed flow table,and the number of active connections was used as a load evaluation parameter.The optimal load redirection scheme was found through ant colony algorithm.During load migration,single-address directed flow table was used to ensure orderly forwarding of traffic at different stages.Experimental results show that the proposed strategy can effectively control the size of flow table and has better performance than traditional equalization strategies.

关 键 词：SDN OpenFlow交换机 负载均衡 蚁群算法 

分 类 号：TP393.0[自动化与计算机技术—计算机应用技术]