CentOS 6.6 eth0 network not working

After installing CentOS 6.6, eth0 exists in list running "ifconfig -a", but no inet addr. eth0 is not active

"vi /etc/sysconfig/network-scripts/ifcfg-eth0", change "ONBOOT=no" to "ONBOOT=yes"
esc :wq
"service network restart"