Ruby on Rails

To run apps based on the Ruby on Rails framework using Unit:

1. Install Unit with a Ruby language module.

2. Install Ruby on Rails and create or deploy your app. Here, we use Ruby on Rails’s basic template:

   $ cd /path/to/ # Path where the application directory will be created; use a real path in your configuration
   

   $ rails new app # Arbitrary app name; becomes the application directory name
   

   This creates the app’s directory tree at /path/to/app/; its public/ subdirectory contains the static files, while the entry point is /path/to/app/config.ru.

3. Change ownership:

   Run the following command (as root) so Unit can access the application directory (If the application uses several directories, run the command for each one):

   # chown -R unit:unit /path/to/app/  # User and group that Unit's router runs as by default
      

   Note:
   The unit:unit user-group pair is available only with official packages , Docker images, and some third-party repos. Otherwise, account names may differ; run the ps aux | grep unitd command to be sure.

   For further details, including permissions, see the security checklist.

4. Next, prepare the Ruby on Rails configuration (use real values for share and working_directory):

   {
      "listeners": {
         "*:80": {
            "pass": "routes"
         }
      },
      "routes": [
         {
            "action": {
            "share": "/path/to/app/public$uri",
            "share_comment": "Serves static files",
            "fallback": {
               "pass": "applications/rails"
            }
            }
         }
      ],
      "applications": {
         "rails": {
            "type": "ruby",
            "script": "config.ru",
            "script_comment": "All requests are handled by a single script, relative to working_directory",
            "working_directory": "/path/to/app/",
            "working_directory_comment": "Path to the application directory, needed here for 'require_relative' directives; use a real path in your configuration"
         }
      }
   }
   

5. Upload the updated configuration.

   Assuming the JSON above was added to config.json. Run the following command as root:

   # curl -X PUT --data-binary @config.json --unix-socket \
         /path/to/control.unit.sock \  # Path to Unit's control socket in your installation
         http://localhost/config/      # Path to the config section in Unit's control API
      

   Note:
   The control socket path may vary; run unitd -h or see Startup and shutdown for details.

   After a successful update, your app should be available on the listener’s IP address and port: