云计算环境下虚拟机迁移机制研究

发布时间：2018-04-17 00:32

本文选题：虚拟化 + 虚拟机迁移　；参考：《解放军信息工程大学》2013年硕士论文

【摘要】：随着云计算的飞速发展，虚拟机动态迁移技术作为云计算重要的支撑技术成为近年来研究的热点，它能保持虚拟机运行的同时将虚拟的运行环境从原来的物理服务器迁移到另一个物理服务器，实现服务器之间的负载均衡、保证服务质量等诸多优秀的特性。目前云平台大都采用集中式的迁移框架，中央管理模块负责虚拟机的迁移决策，容易引起单点失效。另外虚拟机迁移可能跨越复杂的网络环境，容易遭受中间人攻击，，造成虚拟机信息的泄露或篡改，因此如何保护迁移过程中虚拟机的安全性是一个急需解决的问题，针对上述问题，本文提出了虚拟机的自主式迁移框架和虚拟机安全迁移模型VMSMM，其主要工作如下： 1．借鉴蚁群算法的思想，提出了一种面向负载均衡的自主式虚拟机动态迁移框架，该框架不需要中央管理模块，能够实现服务器的自主迁移，避免了单点失效。利用智能蚂蚁的搜索，实现了自主式框架的迁移机制，而且使用模糊逻辑推理根据系统的负载状况自动地调整智能蚂蚁的搜索半径，提高搜索性能。针对自主式框架，制定了虚拟机的动态迁移策略：将服务器按照负载划为四个不同的负载状态域，并根据其所在的状态域进行迁移决策；根据监测数据对服务器未来的负载进行预测；选择待迁移虚拟机时综合考虑资源需求与迁移成本因素。 2．设计了虚拟机安全迁移模型VMSMM。深入研究了虚拟机迁移过程中可能遇到的安全威胁，并针对这些安全威胁，提出了虚拟机迁移的安全需求。结合虚拟机的安全需求，构建了虚拟机的安全迁移模型VMSMM：设计了一套全新的vTPM密钥体系，保证虚拟机迁移的安全性；给出了VMSMM模型中的迁移协议设计，并对协议进行了形式化分析；对模型中的具体操作进行了详细设计。 3．扩展了云计算平台CloudSim实现了本文提出的虚拟机自主式迁移框架。在扩展后的CloudSim平台上进行仿真实验，验证该框架的可行性。确定了合适的框架参数，并且通过仿真实验与比较分析，验证了本文提出的自主式虚拟机迁移框架具有良好的负载均衡效果； 4．在开源平台Xen的基础上增加和修改相关的安全模块，实现本文提出的虚拟安全迁移模型VMSMM。在扩展后Xen平台上进行仿真分析，验证了该模型的可行性。并且通过仿真实验与比较分析，证明了该模型能以可容忍的迁移性能代价换取迁移的安全性。
[Abstract]:With the rapid development of cloud computing, virtual machine dynamic migration technology, as an important supporting technology of cloud computing, has become a hot topic in recent years.It can keep the virtual machine running while migrating the virtual running environment from the original physical server to another physical server to realize the load balance between the servers and ensure the quality of service and many other excellent characteristics.At present, most cloud platforms adopt centralized migration framework, and the central management module is responsible for the migration decision of virtual machines, which can easily lead to single point failure.In addition, virtual machine migration may span the complex network environment and be vulnerable to man-in-the-middle attack, resulting in the disclosure or tampering of virtual machine information. Therefore, how to protect the security of virtual machine in the migration process is an urgent problem to be solved.In order to solve the above problems, this paper proposes an autonomous migration framework for virtual machines and a VMSMMM model for secure migration of virtual machines. The main work of this paper is as follows:1.Based on the idea of ant colony algorithm, an autonomous virtual machine dynamic migration framework for load balancing is proposed. This framework does not need central management module, can realize the autonomous migration of server, and avoids single point failure.The migration mechanism of autonomous framework is realized by using intelligent ant search, and fuzzy logic reasoning is used to automatically adjust the searching radius of intelligent ant according to the load condition of the system, so as to improve the search performance.Aiming at the autonomous framework, the dynamic migration strategy of virtual machine is established: the server is divided into four different load state domains according to the load, and the migration decision is made according to the state domain in which the server is located;According to the monitoring data, the future load of the server is forecasted, and the resource requirements and migration cost factors are taken into account when selecting the virtual machine to be migrated.2.The security migration model of virtual machine (VMSMMM) is designed.In this paper, the possible security threats during virtual machine migration are studied, and the security requirements of virtual machine migration are put forward in view of these security threats.Combined with the security requirement of virtual machine, the security migration model of virtual machine VMS MMM is constructed. A new vTPM key system is designed to ensure the security of virtual machine migration, and the design of migration protocol in VMSMM model is given.The protocol is formalized and the operation in the model is designed in detail.3.We extend the cloud computing platform CloudSim to implement the virtual machine autonomic migration framework proposed in this paper.Simulation experiments are carried out on the extended CloudSim platform to verify the feasibility of the framework.The appropriate frame parameters are determined, and the simulation experiments and comparative analysis show that the proposed autonomous virtual machine migration framework has a good load balancing effect.4.On the basis of open source platform Xen, we add and modify the related security modules, and implement the virtual security migration model VMSM proposed in this paper.The feasibility of the model is verified by simulation analysis on the extended Xen platform.The simulation experiments and comparative analysis show that the model can exchange the safety of migration at the cost of tolerable migration performance.
【学位授予单位】：解放军信息工程大学
【学位级别】：硕士
【学位授予年份】：2013
【分类号】：TP302

【共引文献】