Virtual host

Create a dedicated Apache directory for a virtual host:

sudo mkdir -p /www

sudo mkdir -p /www/pixelfed.fediverse.ovh

sudo chmod -R 755 /www

Edit a new file:

sudo nano /etc/apache2/sites-available/pixelfed.fediverse.ovh.conf

And paste these lines:

<VirtualHost *:80>
    ServerName pixelfed.fediverse.ovh
    DocumentRoot /usr/share/webapps/pixelfed/public
    <Directory /usr/share/webapps/pixelfed/public>
        Options Indexes FollowSymLinks
        AllowOverride All
        Require all granted
    </Directory>
    ErrorLog ${APACHE_LOG_DIR}/pixelfed-fediverse-ovh.error.log
    CustomLog ${APACHE_LOG_DIR}/pixelfed-fediverse-ovh.access.log combined
    # Send requests for PHP files to the PHP-FPM socket
    ProxyPassMatch "^/(.*\.php(/.*)?)$" "unix:/run/php-fpm/pixelfed.sock|fcgi://localhost/usr/share/webapps/pixelfed/public/
</VirtualHost>

Save and exit Nano.
Enable the virtual host an disable the default Apache website:

sudo a2ensite pixelfed.fediverse.ovh.conf

sudo a2dissite 000-default.conf

Restart apache2 service:

sudo systemctl restart apache2