克隆完虚拟机，网卡肯定启动不起来。

会报错

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service network restart
Shutting down loopback insterface:                                                                                                     [  OK  ]
Bringing up loopback insterface:                                                                                                          [  OK  ]
Bringing up interface eth0:  Device eth0 does not seem to be present,delaying initialization.                    [FAILED]

处理起来很简单，
修改，/etc/udev/rules.d/70-persistent-net.rules 

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# This file was automatically generated by the /lib/udev/write_net_rules
# program, run by the persistent-net-generator.rules rules file.
#
# You can modify it, as long as you keep each rule on a single
# line, and change only the value of the NAME= key.

# PCI device 0x8086:0x100f (e1000)
#SUBSYSTEM=="net", ACTION=="add", DRIVERS=="?*", ATTR{address}=="00:0c:29:f6:c7:5e", ATTR{type}=="1", KERNEL=="eth*", NAME="eth0"

# PCI device 0x8086:0x100f (e1000)
SUBSYSTEM=="net", ACTION=="add", DRIVERS=="?*", ATTR{address}=="00:0c:29:4b:e1:f5", ATTR{type}=="1", KERNEL=="eth*", NAME="et
h0" NAME="eth0"

注意，这个配置文件可能有很多条目，eth0,eth1,eth2,等等，我们要做到很简单：
1.留下ethN(N为最大的那个),其他全部注释。
2.将ethN修改成eth0
3.重启系统，注意不是重启服务
然后就ok了。