Abstract: Based on SNMP and LDAP services, this paper designs and implements a complete login service system, which is used to cope with the load-balancing problem when a large number of users login to central computing systems with multiple front-end machines, such as Grids or clusters. This system can schedule users’ login requests via a DNS server which retrieves the IP addresses from a LDAP database that always stores the informations of a set of lowest loaded machines updated with an SNMP-based load-balanced algorithm

Key words: Grid; Load-balancing; Simple network management protocel(SNMP); Lightweight directory accetory protocal(LDAP)

摘要： 以SNMP 协议和LDAP 目录服务为基础，利用DNS 服务对用户请求进行调度，该文提出了一套符合本地实际情况的大量用户登录的解决方案，并实现了一个完整的登录调度系统，很好地解决了集群、网格环境下的大量用户登录的负载平衡问题。

关键词: 网格；负载平衡；简单网络管理协议；轻型目录访问协议