复制或克隆虚拟机后无eth0或eth0变eth1

复制或克隆虚拟机后无 eth0 或 eth0 变eth1 ( 同理eth[x] 变 eth[x+1] )解决方法如下：

在虚拟机里直接删除掉文件 /etc/udev/rules.d/70-persistent-net.rules

原因呢，是 udev 在作怪，关于udev的原理，参考：http://blog.csdn.net/absurd/article/details/1587938

这里简单说明下，看看  /etc/udev/rules.d/70-persistent-net.rules 文件的内容就明白了

 # 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 0x8086:0x100e (e1000)
 SUBSYSTEM=="net", ACTION=="add", DRIVERS=="?*", ATTR{address}=="08:00:27:3a:2e:3f", ATTR{dev_id}=="0x0", ATTR{type}=="1", KERNEL=="eth*", NAME="eth0"

 # PCI device 0x8086:0x100e (e1000)
 SUBSYSTEM=="net", ACTION=="add", DRIVERS=="?*", ATTR{address}=="08:00:27:ed:21:78", ATTR{dev_id}=="0x0", ATTR{type}=="1", KERNEL=="eth*", NAME="eth1"

 # PCI device 0x8086:0x100e (e1000)
 SUBSYSTEM=="net", ACTION=="add", DRIVERS=="?*", ATTR{address}=="08:00:27:9a:24:1d", ATTR{dev_id}=="0x0", ATTR{type}=="1", KERNEL=="eth*", NAME="eth2"

 # PCI device 0x8086:0x100e (e1000)
 SUBSYSTEM=="net", ACTION=="add", DRIVERS=="?*", ATTR{address}=="08:00:27:f8:03:ea", ATTR{dev_id}=="0x0", ATTR{type}=="1", KERNEL=="eth*", NAME="eth3"
 ~

可见我系统目前有4个网络接口：

eth0 MAC地址：08:00:27:3a:2e:3f

eth1 MAC地址：08:00:27:ed:21:78

eth2 MAC地址：08:00:27:9a:24:1d

eth3 MAC地址：08:00:27:f8:03:ea

而我虚拟机提供的网卡的MAC地址只有 08:00:27:f8:03:ea ，所以我在虚拟机里是无法使用 eth0,eth1,eth2 

要想使用eth0 而不是虚拟机移动后的 eth1 等等，可以在 /etc/udev/rules.d/70-persistent-net.rules 里把eth0接口绑定的MAC地址改成当前虚拟机软件（VBox，或VMware...)提供给虚拟机的MAC地址，当然直接删除 /etc/udev/rules.d/70-persistent-net.rules 让系统重新绑定更省事 ！