Posted 15 Dec 2009 — by admin
Category ruby
What is Rack?
Rack provides a minimal, modular and adaptable interface for developing web applications in Ruby. By wrapping HTTP requests and responses in the simplest way possible, it unifies and distills the API for web servers, web frameworks, and software in between (the so-called middleware) into a single method call.
- Rack API Docs
Create and name your file config.ru If rack isn’t installed get it with this command
gem install rack
In your config.ru file
require 'rubygems'
require 'rack'
class HelloRack
def call(env)
[200, {"Content-Type" => "text/html"}, "Hello Rack!"]
end
end
Rack::Handler::Mongrel.run HelloRack.new, 
ort => 8888
Check out http://m.onkey.org/2008/11/17/ruby-on-rack-1
Posted 12 Aug 2009 — by admin
Category Sinatra
Check it out http://sinatra.seanbehan.com/
This assumes Apache2 and the Phusion Passenger module have already been installed. If not you can get up to speed w/ this resource http://seanbehan.com/ruby-on-rails/new-ubuntu-slice-apache-mysql-php-ruby-on-rails-git-and/
First you need Sinatra, so install the gem
gem install sinatra
We need a home for Frank, so create the minimum number of directories in our web directory. The public directory is where we’ll server images, stylesheets, javascript etc. The tmp directory will be where we control Passenger.
cd /var/www/sinatra
mkdir myapp
mkdir myapp/tmp
mkdir myapp/public
cd myapp
vim index.rb
#in index.rb
get '/' do
"Fly me to the moon..."
end
Next we need a configuration file for Rack, important the file extension is “.ru” not .rb!
vim config.ru
require 'rubygems'
require 'sinatra'
Sinatra::Application.default_options.merge!(
:run => false,
:env => ENV['RACK_ENV']
)
require 'index'
run Sinatra.application
Set up the virtual host
ServerName www.myapp.com
DocumentRoot /var/www/sinatra/public
Now you can restart the app if you make adjustments!
touch tmp/restart.txt
Keep on singing 
Inspired by http://blog.zerosum.org/2008/7/4/passenger-3-sinatra
