This article mainly focus on how to run rails app in subdirectory using NGINX. You will learn reverse proxy of nginx to serve your rails app.

It was needed because I came to meet a problem in which I want to run specific part of a website in Ruby on Rails for specific subdirectory.  For example my website is in PHP www.myphpwebsite.com/ and I want to run Ruby on rails site on the same url with different subdirectory like www.myphpwebsite.com/runthisinrubyonrails/. Whenever /runthisinrubyonrails/ detected, It should run on different server which is running   ROR. 

 

Configuration in rails app.

Rails give us simple configuration for this purpose.

In config/application.rb file, add the following code:

module YourAPPName
  class Application < Rails::Application
    config.relative_url_root = '/runthisinrubyonrails'
    # some other configuration code
  end
end

In config.ru file:

map Rails::Application.config.relative_url_root || "/" do
  run Rails.Application
end

Test everything works fine

we can check everything works fine with click route with /runthisinrubyonrails/ and simple by /.

for example first asset was getting by www.myphpwebiste.com/assets/favicon.ico now you can try with www.myphpwebsite.com/runthisinrubyonrails/assets/favicon.ico. Both should work because when we have defined that in our config.ru file

Rails::Application.config.relative_url_root || "/"

if relative_url_root found then try with that if not then try with “/”

Nginx Configuration

So we have the following configuration:

upstream unicorn_sock {
  server your_sock_path;
}

server {
root <path_to_your_rails_app>/public;
location @proxy_rails_app {
  proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
  proxy_set_header Host $http_host;
  proxy_redirect off;
  proxy_pass http://unicorn_sock;
}
location /runthisinrubyonrails/ {
  alias <path_to_your_rails_app>/public/;
  try_files $uri @proxy_rails_app;
}
try_files $uri @proxy_rails_app;
# some other configuration code
}