apache vhost conf for rails

example.vhost.conf

<VirtualHost *:80>
    ServerAdmin [email protected]
    ServerName hostname.com

    DocumentRoot    /var/www/vhosts/ruby/htdocs/public
    CustomLog       /var/www/vhosts/ruby/log/access.log combined
    ErrorLog       /var/www/vhosts/ruby/log/error.log

    <Directory "/var/www/vhosts/ruby/htdocs/public">
        SetOutputFilter DEFLATE
        BrowserMatch ^Mozilla/4 gzip-only-text/html
        BrowserMatch ^Mozilla/4\.0[678] no-gzip
        BrowserMatch \bMSI[E] !no-gzip !gzip-only-text/html
        SetEnvIfNoCase Request_URI \ \.(?:gif|jpe?g|png|swf|mov|mp4)$ no-gzip dont-vary Header append Vary User-Agent env=!dont-vary
    </Directory>

    ErrorDocument 503 /system/maintenance.html
    RewriteEngine On
    RewriteCond %{REQUEST_URI} !.(css|gif|jpg|png)$
    RewriteCond %{DOCUMENT_ROOT}/system/maintenance.html -f
    RewriteCond %{SCRIPT_FILENAME} !maintenance.html
    RewriteRule ^.*$  -  [redirect=503,last]
</VirtualHost>