In my situation, I changed the network adapter configuration of my hypervisor after the installation of CentOS. What happened in this case is that the old interface eth0 no longer existed but a new one called eth1 did.
ls /sys/class/net
eth1 lo
I changed the network config
/etc/sysconfig/network-scripts/ifcfg-eth0
to use DEVICE=eth1
and it worked again.
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