The network card cannot be started under centos7

Problem:

Restart the network card

systemctl restart network

Return error:

Restarting network (via systemctl): Job for network.service failed. See 'systemctl status network.service' and 'journalctl -xn' for details.

Checking the network card status at this time

systemctl status network.service

will return an error: rtnetlink answers file exists

Cause analysis:

Network card mac conflict caused by virtual machine cloning.

Solution:

1. Check mac

ip addr

2. Open ifcfg-eth0 network card configuration file

3. Modify HWADDR = new mac or Delete and restart the machine. It is best to delete or comment out.

4. Restart the system

Recommended related tutorials: centos tutorial

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