Sample apache2.conf with multiple subdomains pointing to a php or rails. Note, these are includes in httpd.conf

blog.datalink.loc

# Virtual host for our Blog, derivative of wordpress based on php.
<VirtualHost 192.168.4.11:80>
   ServerAdmin rupert@datalinktech.com.au
   ServerName blog.datalink.loc
   ServerAlias blog.datalink.loc

   DocumentRoot "/usr/local/datalink/blog"
   <Directory "/usr/local/datalink/blog">
     Options FollowSymLinks Includes ExecCGI
     AllowOverride All
     Order allow,deny
     Allow from all
     DirectoryIndex  index.php
    </Directory>

    php_flag   engine         On
    php_flag   register_globals  Off
    php_flag   short_open_tag    Off
    php_flag   display_errors    On
    php_flag   display_startup_errors  On
    php_flag   ignore_repeated_errors  On
    php_flag   ignore_repeated_source  On
    php_value  docref_root    "/doc/php5/"
    php_value  docref_ext     ".html"

    CustomLog /var/log/httpd/blog.log combinedio
    LogLevel warn
</VirtualHost>

httpd.conf

ServerRoot "/usr/local"
..
..
..
Include etc/apache22/Includes/*.conf

java(jira) using proxy pass to 8080

<VirtualHost 192.168.4.11:80>

  <Proxy *>
    Order deny,allow
    Allow from all
  </Proxy>


  ProxyRequests Off
  ProxyPreserveHost On
  ProxyPass / http://station.datalink.loc:8080/
  ProxyPassReverse / station.datalink.loc:8080/

  ServerName jira.datalink.loc

  CustomLog /var/log/httpd/jira.log combinedio
  LogLevel warn
</VirtualHost>

rails dfms.datalink.loc

<VirtualHost 192.168.4.11:80>
   ServerAdmin rupert@datalinktech.com.au
   ServerName dfms.datalink.loc
   ServerAlias dfms.datalink.loc

   DocumentRoot "/usr/local/datalink/dfms-rails/current/public"
   <Directory "/usr/local/datalink/dfms-rails/current/public">
      #Options Indexes MultiViews
      AllowOverride None
      Order allow,deny
      Allow from all
   </Directory>

   CustomLog /var/log/httpd/dfms-access.log combinedio
   LogLevel warn

   <IfModule mod_rewrite.c>
      RewriteEngine On

      # Redirect all requests to the maintenance page if present
      RewriteCond %{REQUEST_URI} !\.(css|gif|jpg|png)$
      RewriteCond %{DOCUMENT_ROOT}/system/maintenance.html -f
      RewriteCond %{SCRIPT_FILENAME} !maintenance.html
      RewriteRule ^.*$ /system/maintenance.html [L]
   </IfModule>

</VirtualHost>

rails-ssl dfms.datalink.loc

<VirtualHost 192.168.4.11:443>
   ServerAdmin rupert@datalinktech.com.au
   ServerName dfms.datalink.loc
   ServerAlias dfms.datalink.loc

   DocumentRoot "/usr/local/datalink/dfms-rails/current/public"
   <Directory "/usr/local/datalink/dfms-rails/current/public">
      #Options Indexes MultiViews
      AllowOverride None
      Order allow,deny
      Allow from all
   </Directory>

   CustomLog /var/log/httpd/dfms-ssl-access.log combinedio
   LogLevel warn

   <IfModule mod_rewrite.c>
      RewriteEngine On

      # Redirect all requests to the maintenance page if present
      RewriteCond %{REQUEST_URI} !\.(css|gif|jpg|png)$
      RewriteCond %{DOCUMENT_ROOT}/system/maintenance.html -f
      RewriteCond %{SCRIPT_FILENAME} !maintenance.html
      RewriteRule ^.*$ /system/maintenance.html [L]
   </IfModule>

   SSLEngine on
   SSLCertificateFile /usr/local/datalink/certs/dfms.datalink.loc.crt
   SSLCertificateKeyFile /usr/local/datalink/certs/dfms.datalink.loc.key
   #SSLCACertificateFile /usr/certs/cabundle.crt

</VirtualHost>