1. DIS Project Proposal: Robust Content Distribution Network R92725016 周亦方 R92725050 莊豐源 R92725051 黃世翔 By Software Implementation 資管所 研一

2. Motivation The cooperative servers of super enterprise lacks: Load balancing Transparency Fail over Data consistency Status of other server peer

4. A Generic CDN

5. 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

6. 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

7. 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)

8. Diagram System Diagram http://www.cpp.com/index.html http://www.cdn.com/www.cpp.com/matrix4.mpg – ButterFly, RFC 9999

9. 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 estimates Other measurement data…

10. System Requirements (Sever-Side) Any OS running Java Virtual Machine (Linux) Any web server (application server) supporting J2EE (Apache + Tomcat) DNS server (bind)

11. 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 server 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

12. Monitor CDN Nodes: (mirmon) http://www.cs.uu.nl/people/henkp/mirmon/ Mirmon helps administrators in keeping an eye on the mirror sites.

13. Maintain Data Consistency: (rsync) http://rsync.samba.org/ rsync is an open source utility that provides fast incremental file transfer. rsync is freely available under the GNU General Public License

14. Project Participants CBO (Francis 亦方 ): Chief Beautiful Officer CHO (Grant 世翔 ): Chief Handsome Officer QOO (Frank 豐源 ): Queen of Officers

15. Project Timeline Task 10/2011/311/1712/112/1512/291/12 Search & Study System analysis & Design Test environment building Implementation Simulation & Testing Documentation Refinement & Purpose to RFC

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