Configure Apache HTTP Server with Domain Name - Digitalocean
You will need check this article :
How To Point to DigitalOcean Nameservers From Common Domain Registrars
Configuration
Add Digitalocean domain records
Open default.conf file
sudo nano /etc/apache2/sites-available/000-default.conf
Above the configuration:
ServerAdmin webmaster@localhost
DocumentRoot /var/www/html
Add:
ServerName barrouh.com
ServerAlias www.barrouh.com
Restart Apache:
sudo systemctl restart apache2.service