由於網際網路的普及與全球資訊網的快速崛起，使得原本傳統的資訊流通服務大量而快速的轉變為資訊網路服務(Web-enabled Service)，如線上搜尋、線上學習、電子商務、網路多媒體服務、電子化政府等，而在這些資訊網路服務的背後，則是需要一個穩定的網頁伺服器系統來提供龐大的網頁服務(web service)。
特別是網頁主機服務(Web Hosting Service)更是缺乏資源及管理技術的個人、組織及企業進入電子商務市場的首要選擇，對於如此快速增加的資訊網路服務，一個被普遍應用的叢集式架構應用—網頁叢集式伺服器系統是最能夠符合延展性(Scalability)、高可及性(Highly Available)、高效能(High Performance) 的需求；而對於放置許多大量且不同內容型態的網頁於分散式的伺服器系統中，需要面對及解決新的設計及管理的問題，在本論文中將對這些問題提出我們的系統及解決之道。
因此在我們的研究中也延續本實驗室之前的研究經驗，針對系統實作方面提供網路封包轉送的硬體模組設計、URL網址正規化(URL Formalization)的效能改善以及資源管理(Resource Management)等相關議題。
本系統設計與實作於Linux的系統核心(Kernel)之中，可以有效的支援內容為基礎(content-based)的封包繞送，並建立新的系統呼叫來支援叢集伺服器的整合資源管理功能。

Since the speedy popularity of Internet infrastructure and explosive increasing of World Wide Web services, a lot of traditional companies had web-enabled their business over Internet and used WWW as their application platform. Those web services, such as the on-line search, e-learning, e-commence, multimedia, network service, e-government etc., need a stable and powerful web server to support the huge capability.
The web hosting service becomes increasingly important in which the service providers offer system resources to store and to provide Web access to contents from individuals, institutions, and companies, who lack resources or expertise to maintain their Web site. Web server cluster is a popular architecture used by the hosting service providers as a way to create scalable and highly available solutions. However, hosting a variety of contents from different customers on such a distributed server system faces new design and management problems. This dissertation describes the work pursuing for constructing a system to address the challenges of hosting Web content on a server cluster environment.
Based on the achievement of the software-based content-aware distributor, some high repetition and fixity tasks originally treated by software module are delivered to hardware module for speeding up the packet processes and for sharing the loads on the software module. Our software-based distributor is implemented in Linux kernel as a loadable module. A few system calls in user level are built to support the integration of resource management.

中文摘要 ii
ABSTRACT iii
CONTENTS v
FIGURE List vii
TABLE List ix
1 Introduction 1
1.1 Hardware Platform of Server Cluster System 3
1.1.1 General Server Cluster 3
1.1.2 Blade Servers 4
1.2 System Architecture of Web Hosting Services 4
1.3 Issues of Web Hosting Services on Server Cluster 5
1.4 Dissertation Organization 7
2 Related Work 8
2.1 Techniques of Content-Aware Routing 8
2.1.1 TCP State Migration 8
2.1.2 TCP Splicing 10
2.2 Request Distribution Approaches 11
2.2.1 Client-Side Approach 12
2.2.2 DNS-based Approach 13
2.2.3 Layer 4 Routing Approach 14
2.2.4 HTTP Redirection Approach 15
2.3 Hardware Support for Routing Request 16
2.4 Workload Characteristics 17
2.5 Previous Implementation of Our System 19
3 HW/SW Cooperation in Distributor 21
3.1 Introduction 21
3.1.1 Behaviors of Conventional HTTP Protocol 22
3.1.2 Distributor Operations 23
3.1.3 Related Technologies 30
3.2 Design of Network Subsystem 31
3.2.1 Overview of System Architecture 31
3.2.2 Software Module Behavior 33
3.2.3 Packet Classification 35
3.2.4 Mapping Table Structure 36
3.2.5 Table Lookup 39
3.3 Implementation of Packet Forwarder 40
3.3.1 Module Design 41
3.4 Synthesis 49
3.5 Simulation and Verification 50
3.5.1 Module Verification 50
3.5.2 Integrated Behavior Verification 52
3.5.3 Simulation Results 53
3.6 Performance Evaluation 55
4 URL Formalization 57
4.1 Introduction 57
4.2 Issues in URL Formalization 58
4.3 Design and Implementation 60
4.4 Comparison 63
5 Resource Management 68
5.1 Introduction 69
5.2 Architecture of Administration System 70
5.2.1 System Overview 72
5.2.2 User Interface 73
5.2.3 Broker 74
5.2.4 Controller 75
5.2.5 Remote Console 76
5.3 Hosting Content Management System 79
5.3.1 Content Upload 84
5.3.2 Content Placement 85
5.4 Discussion 87
6 Performance Measurement 89
6.1 Measurement Environment 89
6.2 Performance of Content-aware Distributor 91
6.2.1 Overhead of Content-Aware Routing 91
6.2.2 Advantages of the Content-Aware Routing 92
6.3 Performance of Content Placement Scheme 94
7 Conclusions 98
REFERENCE 100
VITA 114

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