NetworkManager causing Device eth0 does not seem to be present, delaying initialization on CentOS

"Device eth0 does not seem to be present, delaying initialization on CentOS" error can be due to

1. Cannot get device settings No such device. 
2. "Device eth0 does not seem to be present" on cloned CentOS VM

Step 1. But it could be also due to the NetworkManager overridding your manual settings in the network configuration. You may want to disabled NetworkManager

# chkconfig --levels 2345 NetworkManager off

Step 2: At the /etc/sysconfig/network-scripts/ifcfg-eth0, do remember to put this line in

.....
..... 
NM_CONTROLLED="no"
.....
.....

Step 3: Reboot the machine and do a ifconfig

# ifconfig

You should be able to see the eth0