000-default.conf

<VirtualHost *:80>
  ServerName www.example.com
  ServerAlias example.com
  ServerAlias openx.example.com
  DocumentRoot /home/deployer/myapp/current/public

  PassengerSpawnMethod conservative
  RackBaseURI /
  RackEnv production

  <Directory /home/deployer/myapp/current/public>
    Options FollowSymLinks
    AllowOverride None
    Order allow,deny
    Allow from all
  </Directory>

  <Location /var/www/openx>
    PassengerEnabled off
    Options FollowSymlinks
    Order allow,deny
    Allow from all
  </Location>

  LogLevel info
  ErrorLog /var/log/apache2/myapp-error.log
  CustomLog /var/log/apache2/myapp-access.log combined

  RewriteEngine On
  RewriteLog /var/log/apache2/myapp-rewrite.log
  RewriteLogLevel 0
  # Canonical host
  RewriteCond %{HTTP_HOST}   !^www.example.com [NC]
  RewriteCond %{HTTP_HOST}   !^openx.example.com [NC]
  RewriteCond %{HTTP_HOST}   !^$
  RewriteRule ^/(.*)$        http://www.example.com/$1 [L,R=301]

  RewriteCond %{DOCUMENT_ROOT}/system/maintenance.html -f
  RewriteCond %{SCRIPT_FILENAME} !maintenance.html
  RewriteRule ^.*$ /system/maintenance.html [L]

</VirtualHost>

openx.conf

<VirtualHost *:80>
        DocumentRoot /var/www/openx
        ServerName openx.example.com

        <Directory />
                PassengerEnabled off
                Options FollowSymLinks
                AllowOverride None
        </Directory>
        <Directory /var/www/openx>
                PassengerEnabled off
                Options Indexes FollowSymLinks MultiViews
                AllowOverride None
                Order allow,deny
                allow from all
                # This directive allows us to have apache2's default start page
                # in /apache2-default/, but still have / go to the right place
                #RedirectMatch ^/$ /apache2-default/
        </Directory>

        ErrorLog /var/log/apache2/error.log

        # Possible values include: debug, info, notice, warn, error, crit,
        # alert, emerg.
        LogLevel warn

        CustomLog /var/log/apache2/access.log combined
        ServerSignature On

        Alias /doc/ "/usr/share/doc/"
        <Directory "/usr/share/doc/">
            Options Indexes MultiViews FollowSymLinks
            AllowOverride None
            Order deny,allow
            Deny from all
            Allow from 127.0.0.0/255.0.0.0 ::1/128
        </Directory>

        RewriteEngine On
        RewriteLog /var/log/apache2/myapp-rewrite.log
        RewriteLogLevel 0

        RewriteCond %{HTTP_HOST}   !^openx.example.com [NC]
        RewriteCond %{HTTP_HOST}   !^$
        RewriteRule ^/(.*)$        http://openx.example.com/$1 [L,R=301]

</VirtualHost>