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

SLIDE 1

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

SLIDE 2

The LAMP Stack

SLIDE 3

The LAMP Stack Physical Server File-based Web Server Relational Database Embedded Scripting Language

SLIDE 4

The New Web Stack

Virtual Servers Web Proxy Document Database REST Framework

SLIDE 5

Virtualization

SLIDE 6

Cloud Infrastructure

SLIDE 7

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

EC2= Elastic Compute Cloud

SLIDE 8

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”

SLIDE 9

Amazon EC2

Elastic IP Load Balancer Application Servers DB Servers EBS Volumes

SLIDE 10

Scalability

“UP” “OUT” “IN” “DOWN”

SLIDE 11

Scalability

bigger machines more machines fewer machines smaller machines

SLIDE 12

Document Databases

SLIDE 13

Relational

Rows
Tables
Schema
Atomic values
Normalization
Joins
Documents
One namespace
No schema
Multiple values
Denormalization
Maps

Document

SLIDE 14

Relational

Atomicity
Consistency
Isolation
Durability
Basically

available

Soft state / scalable
Eventually

consistent

Distributed

“BASE” coined by Dan Pritchett of EBay

SLIDE 15

ReST

ReST= Representational State Transfer
Roy T. Fielding’s Ph.D. thesis
Everything is a resource...
...referenced by URIs...
...viewed & created as representations.

Resource URI Representation

SLIDE 16

WWW

Cookies, sessions
HTTP as transport
URIs reveal server

architecture

Web Sites
Pages
HTML
Stateless
HTTP as API
URIs give names to

resources

Web Services
Resources
HTML, XML, JSON...

ReST

SLIDE 17

Real ReST

Ruby on Rails
Django (Python)
Restlet (Java)
RESTful Web Services

by Richardson

SLIDE 18

Proxies

Mongrel

SLIDE 19

The New Web Stack

Virtual servers, on-demand scalability
Distributed, document-oriented databases
Proxies, load-balancing
ReST and web services

SLIDE 20

Image Credits

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