How to generate hostname from IP?

Question

linux

I need the machines that I raise on the hypervisor to receive the hostname as well as the IP when they start up (so that the hostname is unique for each VM). How to do it without shamanism, who knows?
ps instead of localhost I want to receive 192.168.1.*...

Answer 1

Push a simple script into autoload:

IP=$(ifconfig eth0 | awk '/inet addr/{print substr($2,6)}')
ID=$(echo $IP | sed -e 's/\.//g' | cut -c 7-)
HOSTNAME=$ID.local
echo $HOSTNAME > /etc/hostname && service hostname restart

The output ID is equal to the last two octets (i.e. 192.168.1.52 → 152).