To remotely debug a Unicorn server using RubyMine, you need to set up a remote debugging configuration in RubyMine and configure your Unicorn server to allow debugging connections. Here's a step-by-step guide to help you through the process:

  1. Prerequisites:

    • Make sure you have RubyMine installed on your local machine.
    • Ensure that you have Unicorn installed as a web server for your Rails application and that the application is running on the remote server.
  2. Configure Unicorn for Debugging:

    • In your Unicorn configuration file (usually located in config/unicorn.rb), add the following line to enable debugging:

      # config/unicorn.rb require 'unicorn/debug'
    • This will load the Unicorn debugger middleware, which allows debugging connections to be established.

  3. Start Unicorn Server on Remote Machine:

    • Start the Unicorn server on your remote machine. You can use the unicorn_rails command:

      unicorn_rails -c config/unicorn.rb
  4. Set Up Remote Debugging in RubyMine:

    • Open your Rails project in RubyMine.

    • Go to Run > Edit Configurations from the top menu.

    • Click the + button and select Ruby Remote Debug.

    • In the newly created configuration, specify a name for your configuration (e.g., "Unicorn Remote Debug").

    • Set the following options in the configuration:

      • Host: The hostname or IP address of the remote server where the Unicorn server is running.
      • Port: The port number for the debugger to listen on (e.g., 1234).
    • Click OK to save the configuration.

  5. Start Remote Debugging:

    • In RubyMine, click the Debug button or use the keyboard shortcut Shift + F9 to start the remote debugging session.

    • RubyMine will try to connect to the remote Unicorn server using the configuration you provided.

  6. Trigger a Debugging Session:

    • Place a breakpoint in your Rails application's code where you want the debugging session to start.

    • Access your Rails application in a web browser or through a tool like curl to trigger the code execution that hits the breakpoint.

    • Once the breakpoint is hit, RubyMine will pause the execution, and you can start inspecting variables, stepping through the code, and performing other debugging actions.

That's it! You should now be able to remotely debug your Unicorn server using RubyMine. Remember to remove the require 'unicorn/debug' line from your Unicorn configuration file when you're done with debugging, as the debugger middleware is not intended for production use.

Please note that setting up remote debugging may involve specific network and firewall configurations on the remote machine to allow the debugging connection from your local RubyMine. Ensure that you have the necessary permissions and access to perform remote debugging on the target server.

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