also having a little bit of trouble getting this point to work.
Then edit /etc/hosts. Make it look like this:
127.0.0.1 localhost.localdomain localhost
192.168.0.100 server1.example.com server1
# The following lines are desirable for IPv6 capable hosts
::1 ip6-localhost ip6-loopback
Both should show server1.example.com. If they do not, reboot the system:
shutdown -r now
again. Now they should show server1.example.com.
but they don't show the same???