Configuring a Rails 4 app for production in a subdirectory under Apache

There are a few assumptions I'm going to make in order to try and answer your question.

1. I'm assuming there is a static site served at myurl.com and that you only want the Rails app to be served on myurl.com/myapp

2. I'm assuming your shared hosting provider prefers FastCGI as a way to serve Rack apps (Rails)

Based on those assumptions, I believe that if you:

1. Move your Rails app under the ~/html/myapp folder
2. Add a .htaccess file to ~/html/myapp/public with contents:

    AddHandler fastcgi-script .fcgi    Options +FollowSymLinks +ExecCGI     RewriteEngine On     RewriteCond %{REQUEST_FILENAME} !-f    RewriteRule ^(.*)$ dispatch.fcgi/$1 [QSA,L]     ErrorDocument 500 "Rails application failed to start properly"

1. Add a dispatch.fcgi file to ~/html/myapp/public with contents:

    ENV['RAILS_ENV'] ||= 'production'    ENV['GEM_HOME'] = File.expand_path('your_gem_home')    require 'fcgi'     require File.join(File.dirname(__FILE__), '../config/environment.rb')

1. chmod +x ~/html/myapp/public/dispatch.fcgi

the app should start just fine and route just fine...

I don't think you need to worry about setting config.action_controller.relative_url_root.

I would also install your gems using bundle install --deployment prior to deploying your app.

Finally, the reason you're not getting a root route is because there is no:root :to => 'controller#action' in your config/routes.rb

Hope this helps and if not, check out:

Dreamhost - Rails 3 and FastCGI and FastCGI setup which includes some hints about using ENV['RAILS_RELATIVE_URL_ROOT']