After cloning a virtual machine through centos, it is found that the NIC cannot be started or cannot access the Internet.

1. Disable the network manager.

Chkconfig -- level 35 network on

Chkconfig -- level 0123456 NetworkManager off

Restart

2,

Delete the/etc/udev/rules. d/70-persistent-net.rules file and restart it. The eth0 Nic is started successfully and the/etc/udev/rules. d/70-persistent-net.rules file is regenerated.

It should be enough.

 

3. Modify the NIC configuration of the machine.

VI/etc/sysconfig/network-scripts/ifcfg-eth0

 

4. Modify the Host Name

VI/etc/sysconfig/Network

 

 

The following is a good ifcfg-eth0 file in the virtual machine:

 

DEVICE="eth0"NM_CONTROLLED="yes"ONBOOT="yes"IPADDR=192.168.9.202NETMASK=255.255.255.0BOOTPROTO=yesTYPE="Ethernet"UUID="4874beeb-8c63-4b56-96f2-d78de825ceb2"PREFIX=24DEFROUTE=yesIPV4_FAILURE_FATAL=yesIPV6INIT=noNAME="System eth0"HWADDR=00:0C:29:80:64:30LAST_CONNECT=1355405012GATEWAY=192.168.9.2DNS1=8.8.8.8USERCTL=no