Research On Load Balancing Strategy For Server Cluster

With the rapid development of Internet technology,Network access volume grew rapidly.This will cause more pressure on the server,How to respond more quickly and effectively to the connection requests made by the user,increase the data throughput and improve the efficiency of the server has become an important issue in the research of server.In this paper,The main work and research achievements are:First,The related concepts of server cluster technology and load balancing strategy were understanded,The research status at home and abroad were analyzed;the LVS(Linux Virtual Server)implementation principle and mechanism of cluster technology were studied,The composition of the core of the LVS IPVS software structure and realization mechanism of each module were discussed;Analyzed based on the network layer(IP layer)of the three kinds of load balance technology,principle and application of their respective environment made in depth analysis and comparison;Based on a heartbeat(heartbeat)and DRDB technology research,this paper apply it to the LVS cluster system,improve the usability of the LVS cluster system,ensure the consistency of the data;Study the LVS cluster system was built based on Markov process availability,the mathematical model and its derivation process are analyzed in detail.Second,Several kinds of traditional load balancing algorithm which is based on the technique of the LVS were studied and analyzes the algorithm implementation process and defect;WLC were emphatically studied on load balancing algorithm,puts forward thinking on its shortcomings,and gives the improvement opinion;Based on the study of WLC algorithm proposed my own load balancing algorithm-DWLC algorithm;Completed the design of the algorithm,Established the mathematical model to calculate the dynamic weighting of servers,Ensured the LVS cluster system background real-time weights of each server.Third,The LVS cluster system experimental environment were seted up,The HA module and DRDB software installation and configuration were completed;Using Web Application stress Tool(WAS)pressure test software simulation user access request of different orders of magnitude,the DWLC response rate and implementation of thealgorithm of load balance effect is tested,and the experimental results were analyzed;Results show that operation DWLC algorithm of cluster system relative to the WLC algorithm of cluster system,the response speed of system have increased significantly,load balancing effect has improved significantly.