{"id":2506,"date":"2020-12-21T17:17:11","date_gmt":"2020-12-21T22:17:11","guid":{"rendered":"https:\/\/kb.n0c.com\/?post_type=ht_kb&p=2506"},"modified":"2026-02-06T14:29:22","modified_gmt":"2026-02-06T19:29:22","slug":"ruby-application-management","status":"publish","type":"ht_kb","link":"https:\/\/kb.n0c.com\/en\/knowledge-base\/ruby-application-management\/","title":{"rendered":"How to Manage Ruby Applications"},"content":{"rendered":"\n

Introduction<\/strong><\/h2>\n\n\n\n

Ruby is essentially code executed on our servers to host, create and control web applications using this type of language.<\/p>\n\n\n\n

In this article, we will focus on information for beginners. We will start by explaining how to access Ruby in N0C and provide a detailed example of how to launch and modify an application using this interface. <\/p>\n\n\n\n

Then, for more advanced users, we will explain how to do the same operations in command line.<\/p>\n\n\n\n

Note :<\/strong> The Glossary of N0C<\/a> contains explanations on multiple topics and can be consulted to clarify certain terms.<\/p>\n\n\n\n

Documentation<\/strong><\/h2>\n\n\n\n

Documentation on Ruby can be found on the Web, in particular at: https:\/\/www.ruby-lang.org\/en\/documentation\/<\/a>.<\/p>\n\n\n\n

You can also refer to this site to get more information about the commands of the Ruby Selector<\/strong>: https:\/\/docs.cloudlinux.com\/command-line_tools\/#ruby-selector<\/a>.<\/p>\n\n\n\n

Debugging an Application<\/h3>\n\n\n\n

When an error occurs, a page like the one below is displayed:<\/p>\n\n\n

\n
\"\"<\/a><\/figure><\/div>\n\n\n

This page is not very explanatory. Activating the development mode allows you to investigate (please refer to the article How to Debug a Node.js, Ruby or Python Application<\/a>).<\/p>\n\n\n\n

Prerequisite<\/strong><\/h2>\n\n\n\n

Go to https:\/\/mg.n0c.com\/en\/<\/a>.<\/p>\n\n\n\n

Access to Ruby<\/strong> in N0C<\/h2>\n\n\n\n
    \n
  1. In the Sidebar menu, select Languages<\/strong> > Ruby<\/strong>.<\/li>\n\n\n\n
  2. Applications already set-up are displayed in the interface:<\/li>\n<\/ol>\n\n\n
    \n
    \"\"<\/a><\/figure><\/div>\n\n\n

    Implementation of a New<\/strong> Ruby Application with N0C<\/strong><\/h2>\n\n\n\n

    To explain the approach more easily, we will proceed with an example. <\/p>\n\n\n\n

    Let’s say you want to create an application called coderuby<\/strong> that displays the words “Hello World!”. The following steps are necessary:<\/p>\n\n\n\n

      \n
    1. Beforehand, you need to create an application<\/strong> in the directory intended to contain it (we will call this directory “coderuby” as an example, but the user can give it the name they desire). When it is executed, the application displays “It works!”.<\/li>\n\n\n\n
    2. You then need to program<\/strong> it (in our example, to display “Hello World!”).<\/li>\n\n\n\n
    3. Then, call<\/strong> the application environment.<\/li>\n\n\n\n
    4. Finally, it must be activated<\/strong> in the Ruby environment.<\/li>\n<\/ol>\n\n\n\n

      Step #1 – Create the Ruby Application<\/strong><\/h3>\n\n\n\n

      Make sure the coderuby<\/strong> directory is created (how<\/a>).<\/p>\n\n\n\n

        \n
      1. Click on the Create<\/strong> button :<\/li>\n<\/ol>\n\n\n
        \n
        \"\"<\/a><\/figure><\/div>\n\n\n
          \n
        1. Choose the desired Ruby VERSION<\/strong>:<\/li>\n<\/ol>\n\n\n
          \n
          \"\"<\/a><\/figure><\/div>\n\n\n
            \n
          1. Indicate in which APP DIRECTORY<\/strong> you want the application to be created (in our example, we would write coderuby<\/strong>).<\/li>\n\n\n\n
          2. Indicate from which APPLICATION DOMAIN \/ URL<\/strong> it should be accessible (in our example, we would write coderuby<\/strong>)1<\/sup>.<\/li>\n\n\n\n
          3. Click on the CREATE<\/strong> button.<\/li>\n\n\n\n
          4. Confirm the creation of config.ru<\/strong> by opening the coderuby<\/strong> directory in the File Manager<\/strong> (please refer to the article How to Use the File Manager<\/a>).<\/li>\n\n\n\n
          5. Test the Ruby application by typing https:\/\/DOMAIN\/coderuby<\/strong> in your browser, where DOMAIN<\/strong> should be replaced by your domain name. <\/li>\n\n\n\n
          6. As expected, the result shall be “It works!”.<\/li>\n<\/ol>\n\n\n\n

            Step #2 – <\/strong>Program the Application<\/h3>\n\n\n\n

            Now that the Ruby application is installed and functional in the directory to be used, you can program it as you wish. The application must be started again to see the modifications in the browser when it is exectued.<\/p>\n\n\n\n

            Here are the steps to program:<\/p>\n\n\n\n

              \n
            1. In the File Manager<\/strong>, open the directory (here, coderuby<\/strong>) and edit the code config.ru<\/strong> (please refer to the article How to Use the File Manager<\/a>). <\/li>\n\n\n\n
            2. Program config.ru<\/strong>. In our example, copy the following code in the programming window of the File Manager<\/strong> (please refer to the article How to Use the File Manager<\/a>), so that the words “Hello World!<\/strong>” are displayed when you run coderuby<\/strong> on your domain:<\/li>\n<\/ol>\n\n\n\n
              app = proc do |env|\n    message = \"Hello world!\\n\"\n    version = \"Ruby %s\\n\" % RUBY_VERSION\n    response = [message, version].join(\"\\n\")\n    [200, {\"Content-Type\" => \"text\/plain\"}, [response]]\nend\n\n\nrun app<\/pre>\n\n\n\n
                \n
              1. After having saved the code, close and open N0C again to apply the changes.<\/li>\n\n\n\n
              2. Test the Ruby application by typing https:\/\/DOMAIN\/coderuby<\/strong> in your browser, where DOMAIN<\/strong> should be replaced by your domain name. <\/li>\n\n\n\n
              3. The result shall now be “Hello  World!”.<\/li>\n<\/ol>\n\n\n\n
                Step #3 – Call the Environment of the Application<\/h3>\n\n\n\n
                Before performing any other command (e.g., gem install<\/code> or rake<\/code>), you must call the application environment by running the following command at the root of your application, which will set the environment variables and allow you to configure your application:<\/p>\n\n\n
                \n
                \"\"<\/a><\/figure><\/div>\n\n\n
                The command must be copied into the shell of the account in question. It is possible to connect via SSH.<\/p>\n\n\n\n
                To see the command, you must edit the application (please refer to the paragraph Ruby Application Settings Modification<\/strong>).<\/p>\n\n\n\n
                In our example, the command is:<\/p>\n\n\n\n
                source \/home\/fbkfdayw\/rubyvenv\/coderuby\/2.6\/bin\/activate<\/pre>\n\n\n\n
                Where:<\/p>\n\n\n\n