The document discusses Ruby Platform as a Service (PaaS) providers like Heroku, EngineYard, and Google App Engine. It provides an overview of Heroku's architecture including its use of HTTP, Varnish, routing mash, dyno grid, PostgreSQL, and Memcached. It also describes how to deploy applications to Heroku using Git, create add-ons, and supported frameworks.

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Ruby Cloud Platform
Service: Heroku
@yinhm
June 7, 2010
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2. .
Ruby Platform as a Service
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• Heroku
• EngineYard
• Google App Engine (via JRuby)
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App
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You App Runs on Heroku
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Deploy
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put git workflow, just git push
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6. .
All through API
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$sudo gem install heroku
$heroku create sushi # create
$git push heroku master # deploy
$heroku domains:add sushi.com
$heroku rake db:migrate
$heroku db:push
$heroku addons:add memcached
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7. .
Architecture
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Architecture
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• HTTP: nginx
• Http Cache: Varnish
• Routing Mash: (custom written, Erlang)
• Dyno Grid: code compiled to Slug then deploy cross
services, 1dyno = 1Mongrel
• DB: PostgreSQL
• Memcached
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9. .
Addons
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• Custom domain
• Gem management
• DB import/export
• Cron
• Background job
• Backup: Bundles
• MySQL: Amazon RDS
• SSL
• more...
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Cutting edge tech
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• MongoDB
• Node, private beta
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Supported Frameworks
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• Rails 2.3.x, Rails 3
• supports Rack
• Rack-based: Sinatra, Merb, Ramaze, and Camping
• ActiveRecord, DataMapper or Sequel
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12. .
Create App on Heroku
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before create, you need:
• git
• sign up on heroku website
• public key placed in /.ssh/
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Example App
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Twitter API Proxy
..
r e q u i r e ' http '
r e q u i r e ' reverse_proxy '
use Rack : : ReverseProxy do
# Forward the path /* to h t t p s : / / a p i . t w i t t e r . com/*
r e v e r s e _ p r o x y '/ s e a r c h ' , ' h t t p : / / s e a r c h . t w i t t e r . com/ s e a r c h '
r e v e r s e _ p r o x y ' / ' , ' h t t p s : / / a p i . t w i t t e r . com/ '
end
app = proc do | env |
[ 200 , { ' Content−Type ' = ' t e x t / p l a i n ' } , "b" ]
>
end
run app
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Just released twiap as open source!
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Example: deploy
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$ g i t c l o n e h t t p : / / g i t h u b . com/yinhm/ twiap
$cd twiap
$heroku c r e a t e
C r e a t i n g glowing−water − 3 4 . . . done
Created h t t p : / / glowing−water −34. heroku . com/ | g i t @ h e r o k u . com : glowing−water −34. g i t
G i t remote heroku added
$ g i t push heroku master
$heroku open
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15. .
Pros
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• No lock in, Heroku based on open-source mostly
• Dead simple deployment
• Easy scaling
• 1 dynos for free!
• Custom domain for free
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16. .
Crons
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• 5M DB space limit
• Need credit card to enable some free features
• No public IP(could get blocked in china, you know the
risk)
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References
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• http://heroku.com, Heroku
• http://engineyard.com, EngineYard
• http://code.google.com/appengine/, Google App
Engine
• http://code.google.com/p/appengine-jruby/,
JRuby
• http://github.com/yinhm/twiap, Twiap
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18. .
About
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Created in A E using the beamer class, TeX Live and Emacs.
L X
T
Published under the Creative Commons Attribution 3.0 License
http://creativecommons.org/licenses/by/3.0/
by @yinhm
http://yinhm.appspot.com
Document version June 7, 2010
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