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)

Your time is limited

"Your time is limited, so don't waste it living someone else's life. Don't be trapped by dogma — which is living with the results of other people's thinking. Don't let the noise of others' opinions drown out your own inner voice. And most important, have the courage to follow your heart and intuition. They somehow already know what you truly want to become. Everything else is secondary."
...........................................................................Steve Jobs delivered on June 12, 2005 at Stanford