Academic literature on the topic 'Virtualization; High Availability cluster; Linux'

Fault tolerance is essential in a production-grade service delivery network. One of the solution is build a clustered environment to keep system failure to a minimum. This thesis examines the use of high availability and load balancing services using open source tools in GNU/Linux. The thesis discusses some general technologies of high availability computing as virtualization, synchronization and mirroring. To build relatively cheap high availability clusters is suitable DRDB tool. DRDB is tool for build synchronized Linux block devices. This paper also examines Linux-HA project, Redhat Cluster Suite, LVS, etc. Content Delivery Networks (CDN) replicate content over several mirrored web servers strategically placed at various locations in order to deal with the flash crowds. A CDN has some combination a request-routing and replication mechanism. Thus CDNs offer fast and reliable applications and services by distributing content to cache servers located close to end-users. This work examines open-source CDNs Globule and CoralCDN and test performance of this CDNs in global deployment.

This diploma thesis contains detailed design of high-performance cluster, primarely focused for parallel computing in Octave application. Each of component of this cluster is described along with instructions for installation and configuration. Cluster is based on GNU/Linux operating system and Message Parsing Interface. Design alllows implementation of this cluster in computers of schoolroom with active lessons.

The main purpose of this master's thesis is to propose and implement a SAP CAR (customer activity repository) solution as an application into the current enterprise information system. Following the analysis of the existing system, there will be a solution created, which is fulfilling the customer demands and at the same time it is feasible under given conditions and in the current environment. This project is closely related with addressing the disaster recovery issue for making the system highly available. The final design is implemented, tested and then handed over to the customer.

The goal of this master thesis is to analyze Open Source resources for loadbalancing and high availability, with aim on areas of its typical usage. These areas are particularly solutions of network infrastructure (routers, loadbalancers), generally network and internet services and parallel filesystems. Next part of this thesis is analysis of design, implementation and plans of subsequent advancement of an fast growing Internet project. The effect of this growth is necessity of solving scalability on all levels. The last part is performance analysis of individual loadbalancing methods in the Linux Virtual Server project.

碩士<br>國立高雄應用科技大學<br>電機工程系博碩士班<br>105<br>More and more enterprise use electronic data interchange to deal with business processes, In addition to reduce the unnecessary waste of paper to achieve the function of environmental protection, after operations are also quick and correct relative to paper documents. When the hardware of the machine fails or not connect to network, how to shorten the service interruption time, It is important for the integrity and usability of data transmission. This paper describes three different levels of architecture, the first is a single node architecture, the second is a high availability architecture, when a physical machine failure, the virtual machine can be transferred to another entity machine , Let the standby machine restart and resume the service. The last one is to add DRBD technology can instantly synchronize data, when the service is abnormal, the system will detect the main node of the service interrupt, and start another backup host services, the use of these two Technology to achieve the purpose of dual usability. In the case of failure of the simulation service to verify the proposed dual availability architecture in the hardware and software failure in the service automatically reply to reduce the risk of data transmission disruption.

碩士<br>東海大學<br>資訊工程學系<br>103<br>More and more campus information services are now become cloud service. In order to let the information services uninterrupted, the need for the availability of servers and storage space is getting more important. To achieve that, following subjects need to be discuss: How to minimize downtime, when a hardware failure occurs. How to improve the reliability of information systems. How to build a robust system, with stabilize service, and be able to provide IT service all the time. To figure out solutions of those questions has become very important topics. With host virtualization cluster, it can ensure high availability of hardware. If a physical machine occurs problem, the virtual machine can move to the other entities of the physical machine. With DRBD (Distributed Replicated Block Device), instantly synchronize all the data, when an exception occurs the software can be immediately transfer to replace the system previously provided services, so you can achieve the double protection of the utility. This article would like to introduce a combination technology of Virtualization Cluster with High Availability and DRBD. With this technology, the researchers can build a demonstration of dual-high availability cloud service. In this work, the researchers compare the performance of two kind of virtualization clusters: VMware and OpenStack. To find out the differences and verify the efficiency of the dual-high availability cloud service.

碩士<br>國立宜蘭大學<br>多媒體網路通訊數位學習碩士在職專班<br>106<br>This purpose of the paper is the reserach for Cloud Era. Due to the maturity of cloud virtualization technology, the virtual technology is now used widely to set up the server. This technology is not only to save on the cost for IT infrastructure, but also to maximize the efficiency in the limited resources. Therefore, to transfer web services and system servers to the cloud will become the trend in the future. However, the single point of failurestill occurs while transferring the web server to the cloud such as the service is interrupted due to host downtime, system maintenance, or unable to handle high loading issues while the booming web transaction. Besides, more and more cyber attacks cause serious threats to cloud platform users. In this research, under our own virtual cloud environment, it proposes a high availability architecture by using LVS keepalived components to avoid service interruptions due to the hardware failure or repair of virtual host. To solve the booming web transaction problem, we build the cluster with load balancing technology by using LVS ipvsadm component. It allows to handle a huge number of connection work in a short time, and make the service run smoothly. In addition, OSSEC to enhance the cyber security is used. If the virtual host is subjected to a malicious attack, such as distributed denial-of-service attack, the rule blocking setting in our OSSEC intrusion detection system will keep the operation normally. Cloud cluster architecture used for web server is the future trend. While the single host changes to the cluster, it can prevent the single point of failure risk. In the event of a hardware failure or system maintenance, the cluster architecture will automatically back up the data and remain the normal operation. In the situation of explosive web transaction, it maneuvering increase the number of servers according to the current needs and maintain the normal operation, satisfy the users’ expectation, and always provide the services in high quality and security.