# apt-get update
# apt-get -y install apache2


systemctl status apache2


# mkdir /var/www/www.example1.de
# mkdir /var/www/www.example2.de


# chmod -R 755 /var/www/www.example{1,2}.de


# a2ensite www_example1_de.conf


# systemctl reload apache2


# a2dissite www_example1_de.conf
# systemctl reload apache2


curl -I http://example1.de


curl -I http://www.example1.de


apt-get -y install nginx


# ln -s /etc/nginx/sites-available/www.example1 .de/etc/nginx/sites-enabled/


# systemctl reload nginx


# apt-get -y install snapd
[... New registration ...]


# snap install core
# snap install --classic certbot
# ln -s /snap/bin/certbot /usr/bin/certbot


# certbot --apache