To change network name to eth0 like in old versions of linux, edit file

vi /etc/default/grub

Find

GRUB_CMDLINE_LINUX=""

Replace with

GRUB_CMDLINE_LINUX="net.ifnames=0 biosdevname=0"

Now run

update-grub

On reboot, your network name will be changed back to old eth0/eth1 format.

• CoreOS disable Consistent Network Device Naming