Automatic Network Configuration based on MAC address.

update_eth.sh

#!/bin/bash

hwaddr=$(ifconfig -a | grep HWaddr | awk '{print $5}')
echo "Update /etc/udev/rules.d/70-persistent-net.rules"
cat <<-EOS > /etc/udev/rules.d/70-persistent-net.rules
SUBSYSTEM=="net", ACTION=="add", DRIVERS=="?*", ATTR{address}=="${hwaddr}", ATTR{dev_id}=="0x0", ATTR{type}=="1", KERNEL=="eth*", NAME="eth0"
EOS

echo "Update hostname and ipaddress"
host=$(echo $hwaddr | awk -F: '{print $6}' | tr '[a-z]' '[A-Z]')
ip=$(echo 16i $host p | dc)

hostname="vm-$ip"
echo "$hostname" > /etc/hostname
cat <<-EOS > /etc/hosts
127.0.0.1	localhost	${hostname}
127.0.1.1	${hostname}
EOS

cat <<-EOS > /etc/network/interfaces
# The loopback network interface
auto lo
iface lo inet loopback

# The primary network interface
auto eth0
iface eth0 inet static
    address 192.168.1.${ip}
    netmask 255.255.255.0
    gateway 192.168.1.1
    dns-nameservers 192.168.1.32 8.8.8.8
    broadcast 192.168.1.255
EOS

echo "Update finished. Please reboot the server"