Abstract: Service migration should include three types of state——initial state, active state and complete state. Based on these, this paper proposes the architecture of service migration and analyzes the realization of service migration. When facing security threat, service migration determines whether to migrate, either actively or passively. It is transparent to the users so that they will not feel the change of service. It just migrates the service states with the purpose of shorting migration time by reducing transmitted data. The migration of FTP service is realized.

Key words: survivability, service migration, service state, FTP service

摘要： 基于服务漂移必须包含的3类状态——初始状态、活动状态和完成状态，提出服务漂移的体系结构，分析服务漂移的实现过程。面临威胁事件时，服务漂移技术能主动或被动地漂移到备份节点，以适应威胁，决定是否漂移。服务漂移对用户是透明的，用户感觉不到服务器的变化。服务飘移只对服务状态进行漂移，可以减少传输数据量、缩短漂移时间。以FTP服务为例实现了服务漂移的原型。

关键词: 可生存性, 服务漂移, 服务状态, FTP服务

CLC Number: 

• N945