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CDNשיקולים בשימוש GLOBALDOTS.COM
WHAT IS A CDN?
GLOBAL WEB SITE
End users
Servers
WEB SITE WITH CDN
CDN does• Decrease Latency
• Stop server sprawl
• Increase security
• Price
• Performance
• Features
Which CDN?
Traffic
Dumb Smart
Engagement
Low High
Content
Static Dynamic
Smart Traffic• Modify content on the edge
• Conditions and rules
• Content based load balancing
Dynamic content• Really dynamic?
• Network optimization
• Application integration
High engagement• Application integration
• Build integration
• Use built-in reporting
Application integration
examples
ESI - Edge Side Include• Moves assembly of the web page from the
web server to the Edge server
• Allows easy caching of web page parts
• Can significantly increase caching rates and
lower origin load
Example without ESI<?php
require(‘user-header.php');
require('left-body.php');
require(‘user-body.php');
require('footer.php');
?>
• This happens on the Origin• The result changes for every user and is non-cacheable
Example using ESI<html>
<esi:include src="http://example.com/user-header.php?u=xyz" />
<esi:include src="http://example.com/left-body.php" />
<esi:include src="http://example.com/user-body.php?u=xyz" />
<esi:include src="http://example.com/footer.php" />
</html>
• This happens on the Edge
• Left-body and footer are cacheable
Deploying CDN
Most Important
Use CDN experts
www.globaldots.com
Language• POP
• CHR
• Edge
• Shield
• TTL
• Downstream / Upstream
Application• Whole web site Static assets
• IP address
• Application purging
• Split static from dynamic content
Infrastructure• Check Load balancers
• Origin failover
• CDN failover – Multi CDN?
Monitoring• Access logs
• CDN availability
