Here's the default site config under /etc/apache2/sites-enabled:
<VirtualHost *:80>
ServerName web2
DocumentRoot /var/www/web2/public
</VirtualHost>
<VirtualHost *:80>
ServerName www.test.local
DocumentRoot /var/www/web2/public
<Directory /var/www/web2/public>
AllowOverride all
Options -MultiViews
</Directory>
</VirtualHost>
<Directory /var/www/web2/public>
AllowOverride all
Options -MultiViews
</Directory>
And this is passenger.conf which is under /etc/apache2/mods-enabled:
<IfModule mod_passenger.c>
RailsEnv production
PassengerRoot /opt/rbenv/versions/2.2.2/lib/ruby/gems/2.2.0/gems/passenger-5.0.15
PassengerDefaultRuby /opt/rbenv/versions/2.2.2/bin/ruby
</IfModule>