The network card fails to start after the cold migration of the server hard disk

1、 After migration , There will be one of the network cards that cannot be started （eth0 or eth1）

[[email protected] ~]# ifup eth0

WARNING: Deprecated config file /etc/modprobe.conf, all config files belong into /etc/modprobe.d/.

WARNING: Deprecated config file /etc/modprobe.conf, all config files belong into /etc/modprobe.d/.

Device eth0 does not seem to be present, delaying initialization.

2、 Delete file

[[email protected] ~]# mv /etc/udev/rules.d/70-persistent-net.rules /etc/udev/rules.d/70-persistent-net.rules.bak

3、 Comment out the file ifcfg-eth0 And ifcfg-eth01 in MAC Address （HWADDR）

[[email protected] ~]# cat /etc/sysconfig/network-scripts/ifcfg-eth0

DEVICE=eth0

BOOTPROTO=static

#HWADDR=“XX:XX:XX:XX:XX:XX”

ONBOOT=yes

TYPE=Ethernet

4、 restart The server （ It's hard to restart the network card ）

Extension description ：

The main reason for this problem is that we unplug the hard disk and remove it from one The server Move to another one The server in the future , Two server network cards MAC Different addresses , So we need to clear the original server configuration file MAC Address , Reload the new server after restart MAC Address , The network card starts successfully .

Of course, network cards caused by similar situations MAC The inconsistency between the address information and the configuration file will lead to similar errors in the network card startup prompt .