Disabling NetworkManager on Fedora/Centos

systemctl disable NetworkManager.service
sudo chkconfig --level 2345 NetworkManager off
chkconfig network on

Edit /etc/sysconfig/network-scripts/ifcfg-ethXXX where XXX is each interface you want to be active on boot. Make sure the following are set:

NM_CONTROLLED=no
ONBOOT=yes
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