1. www2.computer.org Basic Architecture Leo Wadsworth, Staff Manager April 2008

2. Major Components l Ubuntu Linux l Xen Virtual Servers l HAProxy l Liferay Portal l Apache web servers l Tomcat servlet container l Alfresco content management l MySQL databases l OpenX ad server l CAS authentication l Alfresco Cache Server l DL Cache server

3. l Debian-based Linux distribution l Server and desktop versions l Easy administration tools l Enterprise cross-domain authentication and single sign on l Integrated with IEEE LDAP l Uses IEEE Web Accounts

4. l HAProxy l Controls load balancing and failover l Admin tool gives easy visibility into entire system l Xen Virtual Servers

5. Standard LAMP Stack Apache Tomcat

6. l Award-winning enterprise class open- source portal server l Integrated with IEEE web accounts l True portal system with tightly integrated collaborative tools l Includes over 60 portlets l Page layout of portlets done using drag and drop l Available on a variety of platforms, we are using Tomcat

7. l Award-winning enterprise class open-source document and content management system l Able to manage millions of items/documents l Integrated with IEEE web accounts l Available on a variety of platforms, we are using Tomcat

8. l World leading enterprise class open- source advertising server l Written using PHP l Able to server millions of impressions in a variety of formats l We are running PHP on Apache webservers

9. Alfresco Cache Server l Alfresco Cache Server l Increases the speed of serving Alfresco content l Consists of clustered Apache servers – simple, robust, fast l Simplifies the role and implementation of the Alfresco server

10. Digital Library Cache Server l Increases the speed and robustness of serving Digital Library content l Provides XML data to the Digital Library portlet l Designed for future growth and capabilities

11. Overall Architecture