Aqui um exemplo para prod e dev vhosts
# Symfony 2 : monapp.dev
<virtualHost *:80>
ServerName monapp.dev
DocumentRoot /data/www/MonApp/web/
<Directory "/data/www/MonApp/web">
DirectoryIndex app_dev.php
Options -Indexes FollowSymLinks SymLinksifOwnerMatch
AllowOverride None
RewriteEngine On
RewriteCond %{REQUEST_FILENAME} !-f
RewriteRule ^(.*)$ app_dev.php [QSA,L]
</Directory>
</VirtualHost>
# Symfony 2 : monapp.prod
<VirtualHost *:80>
ServerName monapp.prod
DocumentRoot /data/www/MonApp/web/
<Directory "/data/www/MonApp/web">
DirectoryIndex app.php
Options -Indexes FollowSymLinks SymLinksifOwnerMatch
AllowOverride All
Allow from All
</Directory>
</VirtualHost>