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How to Get to Second Base with Your CDN

by Mike Brittain

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Tips on how to improve how you use your CDN. Condensed from a lot of material, this talk was crammed into 20 minutes.

Tips on how to improve how you use your CDN. Condensed from a lot of material, this talk was crammed into 20 minutes.

More info available at http://mikebrittain.com.

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How to Get to Second Base with Your CDN Presentation Transcript

Getting to 2nd Base with your Content Delivery Network

Mike Brittain

Engineering Architect

Overview

Measure your performance

Tweak your cache TTLs

Cache dynamic objects

Cache whole pages

Inspect origin hits

Use proper HTTP headers

Use multiple CDNs

Review CDN documentation

Engage your vendor

Overview 20 Minutes

Overview

Cache dynamic objects

Inspect origin traffic

Cache HTML pages

Typical Setup

CDN Storage $$$

Origin Pull CDN lingo for “reverse proxy”

Response Headers

Cache-control: max-age=3600

Last-Modified: Mon, 16 Mar …

ETag: “82c7-378-8e2a”

http://www.askapache.com/htaccess/apache-speed-etags.html

Revalidation Requests

GET /images/generated.css HTTP/1.1

Host: origin.example.com

If-Modified-Since: Mon, 16 Mar …

If-None-Match: ” 82c7-378-8e2a ”

HTTP/1.1 200 OK

Content-Length: 35043

... or ...

HTTP/1.1 304 Not Modified

$$$ $

Review Origin Logs Requests URL Size 28 /images/logo.gif 2 KB 17 /images/nav_tabs.png 5 KB 4,613 /images/annual_report.ppt 16 MB 31 /images/flames.gif 13 KB

Avoid Double Paying

16 MB x 4,600 @ 0.35/GB ≈ $25 (CDN)

16 MB x 4,600 @ 0.50/GB ≈ $36 (origin)

Avoid Double Paying

16 MB x 4,600 @ 0.35/GB ≈ $25 (CDN)

16 MB x 23 @ 0.50/GB ≈ $0.18 (origin)

- ish

Cache HTML Pages

Cache HTML Pages Page built just for Mike

Cache HTML Pages Serve generic version to the CDN Use client-side logic for personalization

Cache HTML Pages Replace generic sections with tailored versions Cookies, JavaScript

Cache HTML Pages Track short history of user interactions Fresh data only where needed Ajax, Cookies, JavaScript

Cache HTML Pages Use tracking pixels for page views Real time data with Ajax, or fake it Ajax, Cookies, JavaScript

Cache HTML Pages

Search Results,

HTML frag., Public APIs,

XML, JSON, RSS

Do you GET it?

Cache HTML Pages

Cache HTML Pages TTLs of 3 mins to 1 hr Psst… under 60 seconds is okay, too.

Cache HTML Pages 92%

Thank You

Slides, etc.

www.mikebrittain.com

Questions

[email_address]

Wait… You’re still here?

No, seriously… go away!

HTTP Headers cURL, telnet, Charles, Fiddler, Firebug, etc.

CDNs Fail

Plan B

Split traffic between (similar) CDNs

Origin servers

Cloud storage

CDNs Fail

Amazon CloudFront: $0.17/GB *

Rackspace Cloud Files: $0.22/GB

JetS3t, Cyberduck, Transit, S3 Browser, S3Fox Plug-in, s3sync.rb, APIs, etc.

Multiple CDNs

Cost vs. Performance

Time

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How to Get to Second Base with Your CDN

by Mike Brittain

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How to Get to Second Base with Your CDN Presentation Transcript