I am having this issue with many of my CentOS servers where after a reboot the network interface fails to come up automatically. This is a big problem for me since I need to drive to the datacenter every time when this happens as a result from a remote reboot. Then on the console eth0 is down and I have to ifup this manually. Is there a specific config file I can check to prevent this from happening in the future?
Ensure that the file
/etc/sysconfig/network-scripts/ifcfg-eth0 has the line
See 9.2. Interface Configuration Files for details.