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== Apache / Mongrel Cluster ==
===Sample Apache Config===
Here's a sample Apache vhost entry for using Ruby on Rails and Mongrel Cluster:

<pre>
NameVirtualHost *:80

<Proxy balancer://mongrel_cluster>
  BalancerMember http://127.0.0.1:5000
  BalancerMember http://127.0.0.1:5001
</Proxy>

<VirtualHost *:80>
  ServerName myserver.com
  DocumentRoot /var/www/myserver.com/current/public
  <Directory "/var/www/myserver.com/current/public">
    Options FollowSymLinks
    AllowOverride None
    Order allow,deny
    Allow from all
  </Directory>
  RewriteEngine On
  RewriteCond %{DOCUMENT_ROOT}/maintenance.html -f
  RewriteCond %{SCRIPT_FILENAME} !maintenance.html
  RewriteRule ^.*$ /maintenance.html [L]
  RewriteRule ^/$ /index.html [QSA]
  RewriteRule ^([^.]+)$ $1.html [QSA]

  RewriteCond %{DOCUMENT_ROOT}/%{REQUEST_FILENAME} !-f
  RewriteRule ^/(.*)$ balancer://mongrel_cluster%{REQUEST_URI} [P,QSA,L]
  AddOutputFilterByType DEFLATE text/html text/plain text/xml
  BrowserMatch ^Mozilla/4 gzip-only-text/html
  BrowserMatch ^Mozilla/4\.0[678] no-gzip
  BrowserMatch \bMSIE !no-gzip !gzip-only-text/html
  ErrorLog logs/myserver_error_log
  CustomLog logs/myserver_access_log combined
  ProxyTimeout 600
</VirtualHost>
</pre>

===Add PHP Support to Apache and Mongrel===

Add these lines to your vhost's conf file:

<pre>
 RewriteCond %{DOCUMENT_ROOT}/%{REQUEST_FILENAME} \.php
 RewriteRule ^(.*)$ $1 [QSA,L]
 RewriteCond %{DOCUMENT_ROOT}/%{REQUEST_FILENAME} !-f
 RewriteCond %{DOCUMENT_ROOT}/%{REQUEST_FILENAME}/index.php -f
 RewriteRule ^(.*)$ $1/index.php [QSA,L]
</pre>

== Apache / Passenger (mod_rails) on Ruby Enterprise Edition ==
This is a great way to improve the performance your your Rails applications.  Installation and setup is pretty straightforward (assuming you have Apache installed already):
# Install Ruby Enterprise Edition
# Install Passenger
# Configure Apache
Phusion already provides great documention on installing REE and Passenger, so I'll skip those, and go right to configuration. Now I'm going do this in a virtual host, though if your Rails app is the only thing running, you could just do the same stuff in the general Apache config.
<pre>
LoadModule passenger_module /opt/ruby-enterprise/lib/ruby/gems/1.8/gems/passenger-x.x.x/ext/apache2/mod_passenger.so
PassengerRoot /opt/ruby/enterprise/lib/ruby/gems/1.8/gems/passenger-x.x.x
PassengerRuby/opt/ruby-enterprise/bin/ruby
# btw, your can put your optimizations here!!!

NameVirtualHost *:80
<VirtualHost *:80>
  ServerName myserver.com
  DocumentRoot /path/to/myrailsapp/public
</VirtualHost>
</pre>

There you go. Pretty much kills the Mongrel config above, right? Now go to the [[Reducing Memory Usage]] page to learn a little about optimizing Passenger for your VPS.
Now what if you want to have your rails app at a sub-uri, e.g. /myrailsapp? This is how you do that:
<pre>
NameVirtualHost *:80
<VirtualHost *:80>
  ServerName myserver.com
  DocumentRoot /var/www/myserver.com
  RailsBaseURI /myrailsapp
</VirtualHost>
</pre>
Then you just need to create a symlink to your apps public directory:
<pre>
ln -s /path/to/myrailsapp/public /var/www/myserver.com
</pre>
Baaam!

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