Set random hostname and register dhcp

rc.local

# set a random unique hostname to limit name collision
hostname=$(uuidgen | md5sum );hostname=${hostname:0:8};
hostname=nc-${hostname}
hostname $hostname
sed -i s/^HOSTNAME=.*$/HOSTNAME=${hostname}/g /etc/sysconfig/network
sed -i s/^DHCP_HOSTNAME=.*$/DHCP_HOSTNAME=${hostname}/g /etc/sysconfig/network-scripts/ifcfg-eth0

#with="  supersede host-name \"${hostname}\";"
#echo $with
#sed -i 's/^.*supersede\\shost-name.*$/${with}/g' /etc/dhclient.conf

/etc/init.d/network restart