How to solve the problem that centos network card cannot be started?

Several solutions to the problem that the network card cannot be started:

Method 1:

If a graphical interface is installed and the NetworkManager service is not closed, it will also As a result, the network card service cannot be started. (Generally rare)

systemctl stop  NetworkManager.service       //关闭服务
systemctl disable NetworkManager.service     //停止开机自启

Method 2:

/etc/udev/rules.d/70-persistent-ipoib.rules The macs of eth0 and eth1 in this file conflict or conflict with others. There is a network card conflict, delete the file and restart the machine.

Method 3:

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"

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