prepare a RHEL/CentOS/etc host for cloning (eg, duplicating a Virtual Machine or creating a VM Template), use the following commands as the last steps:
touch /.unconfigured rm -f /etc/ssh/ssh_host_* ifdown eth0 sed -i '/^HWADDR=.*$/d' /etc/sysconfig/network-scripts/ifcfg-eth0 ifup eth0 rm -f /etc/udev/rules.d/70-persistent-net.rules shutdown -h now