To set up apache find out your distribution and proceed accordingly:

SUSE Linux

yast -i apache2

To start apache, issue

/etc/init.d/apache2 start

TroubleShooting

Symptom:

apache2: Could not determine the server's fully qualified domain name,
using 127.0.0.1 for ServerName

Solution: Enter server name into /etc/apache2/apache2.conf:

ServerName servername