linux(CentOS 6)下如何调整eth网卡顺序

在虚拟机下安装的CentOS6.0，用克隆的方法，一下搞了好几个CentOS6.0的虚拟机，进入系统之后却发现网卡的序号不再是eth0，而是eth1。

运行ifconfig -a的效果如下：



以前CentOS 5.x版本的时候，在/etc/modprobe.conf里面可以定义网卡的顺序，通过：

alias eth0 e1000e
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这种方法来定义。

但是在CentOS6中，已经不存在/etc/modprobe.conf文件了，在/etc/modprobe.d下也不存在对网卡进行配置的配置文件：

[root@localhost modprobe.d]# pwd
/etc/modprobe.d
[root@localhost modprobe.d]# grep eth0 *
[root@localhost modprobe.d]#
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经过分析发现，CentOS 6.0开始通过udev来管理网卡，具体网卡序号的配置文件在：/etc/udev/rules.d/70-persistent-net.rules文件中，其内容为：

# 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 0x15ad:0x07b0 (vmxnet3) (custom name provided by external tool)
SUBSYSTEM=="net", ACTION=="add", DRIVERS=="?*", ATTR{address}=="00:50:56:93:00:00", ATTR{type}=="1", KERNEL=="eth*", NAME="eth0"
 
# PCI device 0x15ad:0x07b0 (vmxnet3)
SUBSYSTEM=="net", ACTION=="add", DRIVERS=="?*", ATTR{address}=="00:50:56:93:00:0e", ATTR{type}=="1", KERNEL=="eth*", NAME="eth1"
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从上面可以看出，原来的eth0网卡是安装CentOS6那台虚拟机的网卡配置（关键是MAC地址），克隆后虚拟网卡的MAC修改了，所以系统自动生成相应的配置文件，网卡序号为eth1，所以在系统中只能看到eth1。

将/etc/udev/rules.d/70-persistent-net.rules修改：

# 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 0x15ad:0x07b0 (vmxnet3)
SUBSYSTEM=="net", ACTION=="add", DRIVERS=="?*", ATTR{address}=="00:50:56:93:00:0e", ATTR{type}=="1", KERNEL=="eth*", NAME="eth0"
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