How to fix Apache - "Could not reliably determine the server's fully qualified domain name...
To stop this message being generated when you start Apache, you need to give it a value for ServerName. Follow the steps below to do this:
At the Pi command line, edit the Apache configuration file name.
sudo nano /etc/apache2/conf.d/name
Add the line
noting the capitalisation, then save and exit. To make these changes live, you need to restart Apache so that it reloads the new configuration.
sudo /etc/init.d/apache2 reload