http://en.wikipedia.org/wiki/FQDN
http://en.wikipedia.org/wiki/Hostname
http://en.wikipedia.org/wiki/Hosts_file

man hosts
man hostname

name of the domain is
lavendel.tk

name of the computer on local network is:
ashley

local ip of server is:
192.168.1.50

outside ip of server is:
192.168.1.50

echo "127.0.0.1     localhost.localdomain   localhost" > /etc/hosts
echo "192.168.1.50  ashley.lavendel.tk    ashley" >> /etc/hosts

echo ashley.lavendel.tk > /etc/hostname