Cloud Computing, Web Services, and the New Web Stack June 19, 2009 - PowerPoint PPT Presentation

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Cloud Computing, Web Services, and the New Web Stack June 19, 2009 Boulder, Colorado Stuart Sierra Columbia Law School Program on Law & Technology columbialawtech.org altlaw.org The LAMP Stack The LAMP Stack Physical File-based

Cloud Computing, Web Services, and the New Web Stack June 19, 2009 Boulder, Colorado Stuart Sierra Columbia Law School Program on Law & Technology columbialawtech.org altlaw.org
The LAMP Stack
The LAMP Stack Physical File-based Server Web Server Embedded Relational Scripting Database Language
The New Web Stack Virtual Web Servers Proxy Document REST Database Framework
Virtualization
Cloud Infrastructure
Amazon EC2 Cost RAM Processor Small $0.10 / hour 1.7 GB 1 core Large $0.40 / hour 7.5 GB 2 cores Extra-Large $0.80 / hour 15 GB 4 cores EC 2 = Elastic Compute Cloud
EC2 ● “Instance” - one virtual machine ● “Image” - OS and root file system ● “Elastic Block Store” (EBS) - virtual disks ● “Availability Zone” - data center location ● “Elastic IP” - assignable public IP address ● “Elastic Load Balancing”
Amazon EC2 Elastic IP Load Balancer EBS DB Volumes Servers Application Servers
“UP” Scalability “OUT” “IN” “DOWN”
bigger machines Scalability more fewer machines machines smaller machines
Document Databases
Relational Document ● Rows ● Documents ● Tables ● One namespace ● Schema ● No schema ● Atomic values ● Multiple values ● Normalization ● Denormalization ● Joins ● Maps
Relational Distributed ● Atomicity ● Basically ● Consistency available ● Isolation ● Soft state / scalable ● Durability ● Eventually consistent “BASE” coined by Dan Pritchett of EBay
ReST ● ReST= Representational State Transfer ● Roy T. Fielding’s Ph.D. thesis ● Everything is a resource... ● ...referenced by URIs... ● ...viewed & created as representations. Representation URI Resource
WWW ReST ● Cookies, sessions ● Stateless ● HTTP as transport ● HTTP as API ● URIs reveal server ● URIs give names to architecture resources ● Web Sites ● Web Services ● Pages ● Resources ● HTML ● HTML, XML, JSON...
Real ReST ● Ruby on Rails ● Django (Python) ● Restlet (Java) ● RESTful Web Services by Richardson
Proxies Mongrel
The New Web Stack ● Virtual servers, on-demand scalability ● Distributed, document-oriented databases ● Proxies, load-balancing ● ReST and web services
Image Credits All trademarks are the property of their respective owners. Other public-domain images from openclipart.org

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