Apache2 fuss with domain name

# /etc/init.d/apache2 restart
Forcing reload of web server (apache2)...apache2: Could not reliably determine the server's fully qualified domain name, using 127.0.0.1 for ServerName
waiting apache2: Could not reliably determine the server's fully qualified domain name, using 127.0.0.1 for ServerName

Add a line in apache2.conf:

ServerName "whatevername"