What if the centos7 network card cannot be started?
This article mainly explains the "centos7 network card can not start what to do", the article explains the content is simple and clear, easy to learn and understand, the following please follow the editor's ideas slowly in depth, together to study and learn "what to do if the centos7 network card can not start"!
Restart the network card
Systemctl restart network / / restart the network card
Return error:
Restarting network (via systemctl): Job for network.service failed. See 'systemctl status network.service' and' journalctl-xn' for details.
Check the status of the network card
Systemctl status network.service
An error will be returned:
Rtnetlink answers file exists
Solution one
For most people, this error is due to the mac conflict of the network card caused by virtual machine cloning (because I am the virtualized environment of VMware, and multiple servers are cloned through modules), modify the new mac of HWADDR= in ifcfg-eth0 or delete and restart the machine. It is best to delete or comment out.
Basically, more than 80% of the network card startup problems can be solved in this way.
View the mac method:
Ip addr
Solution two
If the graphical interface is installed and the NetworkManager service is not closed, it will also cause the network card service to fail to start. (generally rare)
Systemctl stop NetworkManager.service / / shut down the service systemctl disable NetworkManager.service / / stop booting self-starting
Solution three
/ etc/udev/rules.d/70-persistent-ipoib.rules mac conflict between eth0 and eth2 in this file or conflict with other network cards, delete the file and restart the machine
Solution 4
Add the mac address of eth0 to / etc/udev/rules.d/60-net.rules:
SUBSYSTEM== "net", ACTION== "add", SYSFS {address} = = "B0:d5:47:31:b5:45", IMPORT= "/ lib/udev/rename_device% k eth0"
Just restart the machine.
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