I tried it: Apache2 web server on Ubuntu

Installing apache2 on Ubuntu


        $ sudo apt update 
        $ sudo apt install apache2

Apache comes with a default site. The contents are located at /var/www/html and its settings are in a Virtual Host file at /etc/apache2/sites-enabled/000-default.conf

Create directory for the new site


        $ mkdir /var/mysite

Creating the virtual host for the new site

Clone the configuration file of default site for the new site


        $ cd /etc/apache2/sites-available/
        $ cp 000-default.conf mysite.conf

Edit the new configuration file to update the new port number(optional), ServerAdmin, DocumentRoot & add Permissions


        $ sudo nano /etc/apache2/sites-available/mysite.conf

The configuration file should look something like this -


        <VirtualHost *:8081>
          ServerAdmin dev@localhost
          DocumentRoot /var/mysite
  
          <Directory /var/mysite>
              Options Indexes FollowSymLinks
              AllowOverride All
              Require all granted
          </Directory>
  
          ErrorLog ${APACHE_LOG_DIR}/error.log
          CustomLog ${APACHE_LOG_DIR}/access.log combined
  
          #Include conf-available/serve-cgi-bin.conf
        </VirtualHost>

Configure apache to listen to the new port


        $ sudo nano /etc/apache2/ports.conf

Add the following lines for the new port


        NameVirtualHost *:8081
        Listen 8081

Activate the virtual host


        $ sudo a2ensite mysite.conf

Reload the apache service to load new configuration


        $ sudo systemctl reload apache2
        or
        $ sudo service apache2 reload

Test the new site at http://<hostname>:8081/