Apache 2 on Ubuntu

install sudo apt-get install apache2 sudo apt-get install apache2ctl apache2ctl start

Document root
DocumentRoot value is set in the file:
/etc/apache2/sites-available/default

Note that, by default, the value is /var/www/

config
/etc/apache2

logs
/var/log/apache2

to check that nothing else is running on port 80

lsof -i:80    (including docker publish)