基于虚拟机架构的云平台可靠性验证方法研究

发布时间：2019-01-30 08:13

【摘要】：云计算已经成为当前信息技术的主要趋势之一。云计算基于虚拟化技术，可实现资源和规模的动态调整，因而部署在其上的软件的架构、开发技术、测试平台和测试方法都显著区别于传统体系。随着云环境下软件代码量和复杂度的不断增加，软件测试扮演着日益重要的作用。现有可靠性测试方案主要面向传统的单机或节点相对少的分布式环境，大多基于所实现的测试平台传递命令到待测节点，再基于节点的状态分析可靠性，并未充分考虑效率问题和环境的变化。因此，在面对云环境时，一方面，这些方案既无法高效地同时测试、分析成千上万的节点，，也无法应对其中复杂多变的网络和软硬件环境；另一方面，这些方案多预先集成某些测试模块，不具有可扩展性，无法全面测试、分析云环境的可靠性，其结果缺乏可信性和完备性。实现面向云环境的可靠性测试系统的高效性、可扩展性和准确性已成为一大挑战。云平台可靠性测试系统（简称为CloudDTB, A Dependability Test Bed for CloudComputing Systems）基于伸缩性良好的零消息传输协议（ZMTP, Zero MessageTransport Protocol）在传输层和应用层间实现了一个新的通讯中间件和一个支持异步I/O、高度封装Socket的库，并基于该库实现了一个高效、可靠的消息通信机制，以保证高效性和伸缩性；其次，采用基于安全壳（SSH, Secure Shell）协议和哈希的验证匹配技术，CloudDTB可以在动态多变的云环境中精确定位测试目标，保证准确率；再次，借助自定义的挂载策略，CloudDTB可以方便的扩展以支持多种测试场景，可扩展性良好；最后，CloudDTB实现了一个支持多级日志的库函数以详细描述测试信息。实验结果表明，CloudDTB拥有高效的通讯机制，平均每秒可以发送10万条、接收4万条单条大小为1KB的消息；伸缩性良好，支持对云环境内的数千台节点同时测试分析，定位的准确率为100%；具有良好的可扩展性，可以自主挂载不同的测试模块、配置不同的测试用例；能够生成详细的测试描述信息。
[Abstract]:Cloud computing has become one of the main trends of information technology. Based on virtualization technology, cloud computing can realize dynamic adjustment of resources and scale, so the software architecture, development technology, test platform and test methods deployed on cloud computing are all different from traditional systems. With the increasing of software code and complexity in cloud environment, software testing plays an increasingly important role. The existing reliability testing schemes are mainly oriented to the traditional distributed environment of single machine or relatively few nodes, most of which are based on the test platform to transfer commands to the node to be tested, and then based on the status of the node to analyze the reliability. Efficiency issues and environmental changes have not been fully taken into account. Therefore, in the face of cloud environment, on the one hand, these schemes can not test and analyze thousands of nodes efficiently at the same time, nor can they cope with the complex and changeable network and hardware and software environment. On the other hand, these schemes integrate some test modules in advance, which are not extensible and can not be fully tested. The reliability of the cloud environment is analyzed, and the results lack credibility and completeness. It is a challenge to realize the high efficiency, expansibility and accuracy of the reliability testing system in the cloud environment. Cloud platform Reliability Test system (referred to as CloudDTB, A Dependability Test Bed for CloudComputing Systems) based on good scalability Zero message transfer Protocol (ZMTP,) Zero MessageTransport Protocol) implements a new communication middleware and an asynchronous I / O library between the transport layer and the application layer, and highly encapsulates the Socket library. Based on the library, it implements an efficient and reliable message communication mechanism. To ensure high efficiency and scalability; Secondly, by using the verification and matching technology based on containment (SSH, Secure Shell) protocol and hash, CloudDTB can accurately locate the test target in the dynamic and changeable cloud environment, and ensure the accuracy. Thirdly, with the help of the custom mount strategy, CloudDTB can be easily extended to support a variety of test scenarios. Finally, CloudDTB implements a library function supporting multi-level logs to describe test information in detail. The experimental results show that CloudDTB has an efficient communication mechanism, it can send 100000 messages per second on average and receive 40, 000 messages of 1KB size. It has good scalability, supports simultaneous testing and analysis of thousands of nodes in the cloud environment, and the accuracy of positioning is 100. It has good scalability, can mount different test modules independently and configure different test cases. Ability to generate detailed test description information.
【学位授予单位】：华中科技大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TP311.53;TP393.09

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