Use a sub directory as a rails application's url root rails 3, nginx, unicorn

README.md

Symlink for static files

Among applying the changes in the other files in this gist, you need to symlink the directory you are serving the app with in the root app's public directory so that NGINX can serve the static files in the sub-app.

For example, if you have an app at /home/coffeencoke/apps/app.coffeencoke.com/current/public as your root app, and you have the sub app served at http://app.coffeencoke.com/admin, then you need to symlink /home/coffeencoke/apps/admin-app.coffeencoke.com/current/public to /home/coffeencoke/apps/app.coffeencoke.com/current/public/admin like so:

ln -s /home/coffeencoke/apps/admin-app.coffeencoke.com/current/public /home/coffeencoke/apps/app.coffeencoke.com/current/public/admin

Also...

Issue when deploying a fresh environment and running deploy:cold you may get an error that says "cannot stat /....manifest.yml" Added an issue in github: capistrano/capistrano#379 Work around is to manually run the rake assets precompile method in app/shared/cached-copy and move the assets/admin/manifest.yml file to /app/shared/assets/manifest.yml

$ cap ui deploy:setup deploy:cold # this will fail, but will setup our files for us
$ ssh coffeencoke@app.coffeencoke.com
$ cd ~/apps/admin-app.coffeencoke.com/shared/cached-copy
$ bundle install --without test development
$ bundle exec rake RAILS_ENV=qa RAILS_GROUPS=assets assets:precompile
$ cp -- public/admin/assets/manifest.yml ../assets/
$ exit
$ cap ui deploy:cold

application.rb

# This is for the admin app only
#
# Among other app config things, add these two lines within your Application.configure block
#
# You can also put this in the config file for each individual environment. So you can still use
# localhost:3000 w/out the subdirectory for development mode and tests and such.
#
AppAdmin::Application.configure do
  # ...
  
  # Serve the app from host/admin
  config.root_directory = '/admin'
  config.assets.prefix = '/admin/assets/'
end

nginx.conf

worker_processes  1;

events {
    worker_connections  1024;
}

http {
  include       mime.types;
  default_type  application/octet-stream;
  sendfile        on;
  keepalive_timeout  65;

  server {
    listen          80;
    server_name     app.coffeencoke.com app;
    access_log      /var/log/nginx/app.coffeencoke.com.access.log;
    error_log       /var/log/nginx/app.coffeencoke.com.error.log info;
    root   /home/coffeencoke/app.coffeencoke.com/public;

    location / {
      try_files $uri @unicorn_proxy;
    }

    location @unicorn_proxy {
      proxy_pass http://127.0.0.1:8081;
      proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
      proxy_set_header Host $http_host;
      proxy_redirect off;
      proxy_set_header X-Forwarded-Proto $scheme;
    }

    location /admin {
      try_files $uri @unicorn_proxy_admin;
    }

    location @unicorn_proxy_admin {
      proxy_pass http://127.0.0.1:8080;
      proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
      proxy_set_header Host $http_host;
      proxy_redirect off;
      proxy_set_header X-Forwarded-Proto $scheme;
    }
  }
}

routes.rb

require 'rails/application'

module RouteScoper
  # Keep the rescue so that you can revert to not having a 
  # subdirectory when in development and test modes
  def self.root
    Rails.application.config.root_directory
  rescue NameError
    '/'
  end
end

MagnetTesterAdmin::Application.routes.draw do
  scope RouteScoper.root do
    resource :session, only: :new
    root :to => 'awesome_rootness#show'
  end
end

is it possible to make short video tutorial about this ?