本文選題：集群技術(shù) + Linux虛擬服務(wù)器　； 參考：《北京郵電大學(xué)》2013年碩士論文

【摘要】：隨著網(wǎng)絡(luò)服務(wù)的不斷發(fā)展,用戶的訪問量和服務(wù)器的負載量呈現(xiàn)指數(shù)級的增長,如何向用戶提供高質(zhì)量、不間斷的網(wǎng)絡(luò)服務(wù),成為網(wǎng)絡(luò)服務(wù)器供應(yīng)商必須解決的難題。利用單一的服務(wù)器結(jié)構(gòu)很難滿足此需求,而集群技術(shù)的應(yīng)用使得該問題迎刃而解。 集群技術(shù)就是將一組相互獨立的、通過高速網(wǎng)絡(luò)互聯(lián)的計算機構(gòu)成一個整體,并通過單一系統(tǒng)的模式加以管理,使得用戶與集群相互作用時,集群像是一個獨立的服務(wù)器。作為集群實現(xiàn)技術(shù)的一種Linux虛擬服務(wù)器(LVS)已被廣泛關(guān)注和應(yīng)用。 盡管目前LVS集群系統(tǒng)的應(yīng)用較為廣泛,但是LVS集群在負載均衡方面還不完善,現(xiàn)有的幾種負載均衡算法并不能根據(jù)真實服務(wù)器的實時負載情況,來及時的調(diào)整負載的分配策略,這樣很容易導(dǎo)致系統(tǒng)出現(xiàn)負載傾斜的現(xiàn)象,使集群性能大大降低。 針對此問題,本論文提出了一種能夠動態(tài)調(diào)整服務(wù)器權(quán)值的動態(tài)負載均衡策略,該策略能夠有效地避免集群出現(xiàn)負載傾斜的現(xiàn)象,進而提升集群整體的性能。 論文主要涉及了以下工作： 首先,研究了集群系統(tǒng)和負載均衡技術(shù),對兩者有了初步的了解。 然后,深入研究LVS集群技術(shù),對其體系結(jié)構(gòu)、工作原理和三種工作模式有了較為深刻的認識。同時還研究了現(xiàn)有的八種負載調(diào)度算法,并重點對WLC算法進行了深入分析,總結(jié)其存在的不足之處。 接著,針對WLC算法存在的缺陷,提出了動態(tài)負載均衡策略的思想,設(shè)計并實現(xiàn)了相應(yīng)的動態(tài)負載模塊(Dynamic-Load Module)。 再次,搭建簡單測試環(huán)境,利用壓力測試工具---Web Application Stress Tool(WAS),對原有的WLC算法和改進后的動態(tài)負載均衡策略進行性能測試,通過對實驗結(jié)果的對比分析,初步驗證了動態(tài)負載均衡策略能夠有效地提升集群系統(tǒng)的性能。 最后,利用中國移動研究院的PDM-PAAS項目的部署環(huán)境,對動態(tài)負載均衡策略進行復(fù)雜環(huán)境下的性能測試,也采用了WAS壓力.測試工具,對原有的WLC算法和動態(tài)負載均衡策略進行了性能對比測試,并對實驗數(shù)據(jù)進行了對比分析,進一步驗證了動態(tài)負載均衡策略的有效性,并能夠?qū)⑵鋺?yīng)用在PDM-PAAS項目中。
[Abstract]:With the continuous development of network services, the number of users and the load of servers increase exponentially. How to provide users with high quality and continuous network services has become a difficult problem that network server providers must solve. It is difficult to satisfy this requirement by using a single server structure, but the application of cluster technology can solve the problem easily. Cluster technology is a group of independent computers interconnected by high-speed networks to form a whole, and through a single system model to be managed, so that when users interact with the cluster, the cluster is like an independent server. As a cluster implementation technology, Linux Virtual Server (LVS) has been widely concerned and applied. Although the LVS cluster system is widely used at present, the load balancing of LVS cluster is not perfect. The existing load balancing algorithms can not adjust the load allocation strategy according to the real server's real-time load situation. This can easily lead to the phenomenon of system load tilt, so that the performance of the cluster is greatly reduced. To solve this problem, this paper proposes a dynamic load balancing strategy which can dynamically adjust the weights of the server. This strategy can effectively avoid the phenomenon of load tilt in the cluster and improve the overall performance of the cluster. The main contents of this paper are as follows: firstly, the cluster system and load balancing technology are studied. Then, the LVS cluster technology is deeply studied, and its architecture, working principle and three working modes are deeply understood. At the same time, eight existing load scheduling algorithms are studied, and the WLC algorithm is analyzed in detail, and the shortcomings of WLC algorithm are summarized. Then, aiming at the shortcomings of WLC algorithm, the idea of dynamic load balancing strategy is put forward, and the corresponding dynamic load module is designed and implemented. Thirdly, a simple test environment is built, and the original Application stress tool (was) is used to test the performance of the original WLC algorithm and the improved dynamic load balancing strategy. It is preliminarily verified that dynamic load balancing strategy can effectively improve the performance of cluster system. Finally, the deployment environment of PDM-PAAS project of China Mobile Research Institute is used to test the performance of dynamic load balancing strategy in complex environment, and was pressure is also used. The performance of the original WLC algorithm and the dynamic load balancing strategy is compared with the test tool, and the experimental data are compared and analyzed. The validity of the dynamic load balancing strategy is further verified, and it can be applied to PDM-PAAS project.
【學(xué)位授予單位】：北京郵電大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2013
【分類號】：TP368.5

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本文編號：2072079