DIS Project Proposal:RobustContent Distribution Network

R92725016 周亦方R92725050 莊豐源R92725051 黃世翔

By Software Implementation

資管所 研一

Motivation

The cooperative servers of super enterprise lacks:Load balancingTransparencyFail overData consistencyStatus of other server peer

A Generic CDN

Scenario

Websites of an super enterprise have common contents and specific contents.

Main load bottleneck is specific content.Common contents (*.html, …): served by

web servers.Specific contents (*. mpg, *.tar.gz, *.zip,

…): served by CDN nodes.

Ex: http://www.cpp.com

Goals & System Description

Distribute the common contents with several web servers by the nature of DNS (LB, FO)

Distribute the specific contents with CDN nodes (LB, FO)

Ex: http://www.cdn.com

User can access the most efficient CDN node without location knowledge (TP).

The specific contents of CDN nodes are synchronized (DC).

The ability of CDN nodes are equal, so that when the root node fails we can elect a new root. (FO)

Root node can monitor other nodes, but other nodes also have the ability. (ST)

DiagramSystem Diagram

http://www.cpp.com/index.htmlhttp://www.cdn.com/www.cpp.com/matrix4.mpg

– ButterFly, RFC 9999

Rules of Selecting the Most Efficient CDN Node:

Select the most efficient CDN node by judging where client source IP address (or ISP) belongs to.

Internet routing tables (BGP tables)Round trip time estimatesOther measurement data…

System Requirements (Sever-Side)

Any OS running Java Virtual Machine (Linux)

Any web server (application server) supporting J2EE (Apache + Tomcat)

DNS server (bind)

Implementation

Web Servers: Several Apache (+ Tomcat) web servers serving common contents

CDN nodes: Several Apache web servers (or FTP servers) serving specific contents

DNS servers: bind CDN module: A Java multi-thread pre-DNS se

rver written by us, which can be combined with bind DNS server to select the best CDN node for client user.

Peer health status monitor: mirmon Data consistency: rsync

Monitor CDN Nodes: (mirmon)

http://www.cs.uu.nl/people/henkp/mirmon/

Mirmon helps administrators in keeping an eye on the mirror sites.

Maintain Data Consistency: (rsync)

http://rsync.samba.org/rsync is an open source utility that provid

es fast incremental file transfer. rsync is freely available under the GNU General Public License

Project Participants

CBO (Francis 亦方 ):Chief Beautiful Officer

CHO (Grant 世翔 ):Chief Handsome Officer

QOO (Frank 豐源 ):Queen of Officers

Project Timeline

Task 10/20 11/3 11/17 12/1 12/15 12/29 1/12

Search & Study

System analysis & Design

Test environment building

Implementation

Simulation & Testing

Documentation

Refinement & Purpose to RFC

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