在虚拟机克隆centos6.4后，重启网卡起不来（可能报device eth0 does not seem to be present, delaying initialization）的解决办法如下：

1. 删除eth0配置文件中的mac地址：

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

2. 删除/etc/udev/rules.d/70-persistent-net.rules文件后，重启系统

rm -rf /etc/udev/rules.d/70-persistent-net.rules

3. 重启网卡

[root@mail ~]# /etc/init.d/network restart
Shutting down interface eth0:                              [  OK  ]
Shutting down loopback interface:                          [  OK  ]
Bringing up loopback interface:                            [  OK  ]
Bringing up interface eth0:                                [  OK  ]