How to fix CentOS 7 network card down after power-on or reboot

Check /etc/sysconfig/network

# cat /etc/sysconfig/network | grep -i networking

Make sure the value of NETWORKING is set to ‘yes’

Check /etc/sysconfig/network-scripts/ifcfg-eth0

# cat /etc/sysconfig/network-scripts/ifcfg-eth0  | grep -i onboot

Make sure the value of ONBOOT is set to ‘yes’

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