多入口条件下WEB服务器负载均衡高可用性的研究

Research on High Availability Load Balancing Algorithm of WEB Server Under Multi-entry

对于高负荷条件下的WEB服务器集群的负载均衡,主要问题之一是如何获取实时负载及负载能否有效衡量整个网络的利用率和性能,即须找出合适的参数作为负载并动态获取到。本文就这一问题提出了对交换设备使用SNMP动态采集负载信息,用于负载模型中。主要思路是利用NET-SNMPAPI对管理设备发送get-request请求包,再处理响应包中的变量值为所需格式,接着运用到综合负载模型中,最后采用最小加权轮询调度处理用户请求。

For WEB server load balancing cluster under high-load conditions,one of the problems is how to obtain real-time load and ensure it can effectively measure the network utilization and performance,that is,dynamically access to the appropriate load parameters.So the writer put forward a method that can dynamically collect load information of switching equipment for the load model using SNMP.The basic clue is：first using NET-SNMP API,sending get-request packets to managed devices,then processing variable values of response packets to desired format,next applying them to integrated load model,finally scheduling user＇s requests based on minimum weighted round-robin algorithm.