Could not reliably determine the server's fully qualified domain name

Question

I have just installed Apache 2.2.17, and I am using it first time.

Now when I try to start the server using the command service httpd start it gives me

Answer 1

Two things seemed to do it for me:

1. Put all aliases for 127.0.0.1 in /etc/hosts in a single line (e.g. 127.0.0.1 localhost mysite.local myothersite.local
2. Set ServerName in my httpd.conf to 0.0.0.0 (localhost or 127.0.0.1 didn't work for me)

Editing /etc/hosts got rid of long response times and setting the ServerName got rid of OP's warning for me.