Handling Linux network card startup error: RTNETLINK answers: File exists

After modifying the network card parameter configuration on the Linux host, the network card often restarts. Sometimes the network card restarts and an error RTNETLINK answers: File exists, what is the reason? Please see the introduction below for details.

1. Problem description

Under Linux, use the service network restart command to restart the network card , and a restart failure error will appear as shown.

2. Check the problem details

Use the systemctl status network.service command to view error details.

3. Cause analysis and solutions

This kind of error is usually caused by a conflict with the NetworkManager service. Just close the NetworkManger service directly, service NetworkManager stop,and disable starting systemctl disable NetworkManager at boot.

Restart network service

service network restart

Check the network card status, active is normal

systemctl status network.service

Precautions:

Use the command systemctl disable NetworkManager on Centos7 to turn off auto-start

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