How to Install Ralph on NixOS

Ralph is an asset management tool that can help you discover, inventory, and audit your infrastructure. In this tutorial, we will demonstrate how to install Ralph on the latest version of NixOS.

Prerequisites

Before we begin, ensure that you have the following:

• A running instance of the latest version of NixOS.
• Administrative access to the system.
• A stable internet connection.

Step 1: Install PostgreSQL

The first step in installing Ralph on NixOS is to install PostgreSQL. Run the following command to install the PostgreSQL package:

$ sudo nix-env -i postgresql

Step 2: Create the Ralph User and Database

Next, create the Ralph user and database in PostgreSQL by entering the following commands:

$ sudo su postgres -c "createuser -dralph"
$ sudo su postgres -c "createdb -E UTF8 -O ralph ralph"

Step 3: Install Ralph

Now, install Ralph on your NixOS by running the following command:

$ sudo nix-env -iA nixos-ralph

Step 4: Configure Ralph

After successfully installing, we need to configure Ralph. Open the /etc/ralph/ralph.conf file and update the PostgreSQL access credentials to match the credentials you created in step 2.

DATABASES = {
    'default': {
        'ENGINE': 'ralph.data_center.backends.postgres',
        'NAME': 'ralph',
        'USER': 'ralph',
        'PASSWORD': 'your_password',
        'HOST': 'localhost',
        'PORT': '',
        'CONN_MAX_AGE': 0,
    },
}

Save the file when you're done.

Step 5: Set Up Ralph

Now we need to set up the Ralph database schemas by running the following command:

$ sudo ralph migrate

Step 6: Start Ralph

Finally, start Ralph by running the following command:

$ sudo systemctl enable ralph
$ sudo systemctl start ralph

Conclusion

Congratulations! You have successfully installed Ralph on NixOS. You can now access your Ralph instance by visiting the http://localhost:8000 in your web browser.