Changing Network Interfaces in Centos 7

vi /etc/default/grub


add net.ifnames=0 in GRUB_CMDLINE_LINUX variable as below.
GRUB_CMDLINE_LINUX="crashkernel=auto rhgb quiet net.ifnames=0"

then rebuild the grub
grub2-mkconfig -o /boot/grub2/grub.cfg

rename the network interface
cd /etc/sysconfig/network-scripts
mv ifcfg-ens32 ifcfg-eth0

edit the network-interface and change the value of DEVICE and NAME, then reboot the server.