How to build CDN for your website

Martin Kulov

Microsoft Regional Director, VS ALM MVP

State of WWW today

Average page size is 25% bigger

From avg 626kB up to 784kB

For just one year!

Almost 1MB by the end of this year!

Website Users

Many have broadband network

Many of them do not

Mobile users are increasing

Tablets are going strong

All users expect page to load in ~2sec

US mobile data traffic

Page Load Time for Mobile

Typical web app today…Loads in 10sec

Have ~80 resources (img, css, js)

Have just one web server

Webpage Waterfall – Fail

Connection View – Fail

What can you do today?Get content closer to users

Load resources in parallel

Use Content Delivery Network (CDN) aka Edge Caching Network (ECN)

Or built similar one by yourself

Webpage Waterfall – OK

Connection View – OK

Benefits

Increased Speed

Price Optimization

Load Balancing

Existing CDN

Microsoft Ajax CDNhttp://www.asp.net/ajaxlibrary/cdn.ashx

Google Librarieshttp://code.google.com/apis/libraries/

Telerik Extensions CDNhttp://www.telerik.com/help/aspnet-mvc/web-assets-telerik-cdn-support.html

Using On Premise CDN

How web works

DNS

Browser

Web ServerIP

Host

Home.aspx

HTML

gif, jpg, css, js

...~ x80

How web works with CDN

DNS

Browser

Web Server

IP

Host Home.aspx

HTML

gif, jpg, css, js

Edge Servers

...

DNS

geoDNS

Netmask ordering

Round robin

IIS

URL rewrite – response HTML

Caching – output, kernel

Static server

To blob or not to blob – MS Research

http://tinyurl.com/m5v3wc

Application Request Routing

DEMO: UrlRewrite and ARR

Using Cloud CDN

Windows Azure CDN

Move the content closest to clients

99.9% monthly SLA

Used by Windows Update, Bing Maps…

Deliver static content

Deliver streaming media

22 locations in US, Europe, Asia, Australia, and South America

Setting up Azure CDN

Azure Subscription

Storage account

Blob container

Custom domain name

Pricing

$0.12/GB from Europe and North America

$0.19/GB from other locations

$0.01/10,000 transactions

304 requests also generate traffic

Not enabled by default in IIS

DEMO: Window Azure CDN

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