When you start or restart your apache server on Linux and it gives you such error message like below, that means you didn’t specified the domain or ip that your server has to respond to.
AH00558: apache2: Could not reliably determine the server's fully qualified domain name, using 127.0.1.1. Set the 'ServerName' directive globally to suppress this message
It is very easy to solve this, I will show you how, just execute these commands (tested on Debian and Ubuntu):
Add at the end of the document:
“YourDomain.com” can also be a ip address.
Finally, just restart apache:
service apache2 restart
And that’s all, everything would be ok right now.