passenger、mod_railsインストール

apache2のheaderをあらかじめいれとく

sudo apt-get install apache2-prefork-dev
sudo gem install passenger
sudo passenger-install-apache2-module

でmod_railsが入る。最初に依存モジュールがチェックされるが全部入ってた

The Apache 2 module was successfully installed.

Please edit your Apache configuration file, and add these lines:

   LoadModule passenger_module /usr/lib/ruby/gems/1.8/gems/passenger-2.2.4/ext/apache2/mod_passenger.so                                                                                                     
   PassengerRoot /usr/lib/ruby/gems/1.8/gems/passenger-2.2.4
   PassengerRuby /usr/bin/ruby1.8

Deploying a Ruby on Rails application: an example

Suppose you have a Ruby on Rails application in /somewhere. Add a virtual host
to your Apache configuration file, and set its DocumentRoot to
/somewhere/public, like this:

   <VirtualHost *:80>
      ServerName www.yourhost.com
      DocumentRoot /somewhere/public    # <-- be sure to point to 'public'!
   </VirtualHost>

And that's it! You may also want to check the Users Guide for security and
optimization tips and other useful information:

  /usr/lib/ruby/gems/1.8/gems/passenger-2.2.4/doc/Users guide Apache.html

/etc/apache2/httpd.conf

LoadModule passenger_module /var/lib/gems/1.8/gems/passenger-2.0.6/ext/apache2/mod_passenger.so
PassengerRoot /var/lib/gems/1.8/gems/passenger-2.0.6
PassengerRuby /usr/bin/ruby1.8

ここまでやって気づいたが、このサーバーバーチャルホスト使えないんだった。やめた。