RHEL6 虚拟机克隆网络问题解决方法
RHEL6 虚拟机克隆网络问题解决方法
环境：Virtualbox+RHEL 6 x64
用VirtualBox的vboxmanager克隆的虚拟机，操作系统RHEL6，启动后发现网卡不能用了。重启网络服务，报以下错误:
Bringing up interface eth0: Device eth0 does not seem to be present, delaying initialization. [FAILED]
在RHEL5里也发生类似事情，因为复制虚拟机MAC会重新生成，但是操作系统的MAC却写在ifcfg-ethx里，造成了不一致，所以不能启动网络接口，在RHEL5里可以使用kudzu或者注释网卡配置文件的MAC字段来解决这个问题。但是在RHEL6里，kudzu已经被hal服务取代了。虽然lspci能够正常认到网卡，但是却无法使用/etc/init.d/network restart来启动服务。尝试注释ifcfg-eth0的MAC字段，还是报错。查看了下udev的规则，发现了问题的所在。
[root@Oracle ~]# cat /etc/udev/rules.d/70-persistent-net.rules
# 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.
# net device () (custom name provided by external tool)
SUBSYSTEM=="net", ACTION=="add", DRIVERS=="?*", ATTR{address}=="08:00:27:16:31:11", ATTR{type}=="1", KERNEL=="eth*", NAME="eth0"
# net device ()
SUBSYSTEM=="net", ACTION=="add", DRIVERS=="?*", ATTR{address}=="08:00:27:32:66:63", ATTR{type}=="1", KERNEL=="eth*", NAME="eth1"
[root@Oracle ~]#
原来UDEV这里把克隆前的MAC当成了当前虚拟机的eth0 MAC，而重新生成的08:00:27:32:66:63是eth1的MAC。
解决这个问题，只要删除旧的UDEV配置，修改为：
[root@Oracle ~]# cat /etc/udev/rules.d/70-persistent-net.rules
# 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.
# net device () (custom name provided by external tool)
SUBSYSTEM=="net", ACTION=="add", DRIVERS=="?*", ATTR{address}=="08:00:27:32:66:63", ATTR{type}=="1", KERNEL=="eth*", NAME="eth0"
重启network服务，一切OK
[root@Oracle ~]# /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 ]
[root@Oracle ~]# ifconfig eth0
eth0 Link encap:Ethernet HWaddr 08:00:27:32:66:63
inet addr:172.16.100.3 Bcast:172.16.100.255 Mask:255.255.255.0
inet6 addr: fe80::a00:27ff:fe32:6663/64 Scope:Link
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:206 errors:0 dropped:0 overruns:0 frame:0
TX packets:203 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:21157 (20.6 KiB) TX bytes:24515 (23.9 KiB)
现象:
一台克隆生成的centos,启动后使用ifconfig查看网络信息,发现只有lo而没有任何可用网卡.
使用ifup eth0后报kvm device eth0 does not seem to be present delaying initialization
大概意识是找不到eth0这个网络设备
使用
ls /sys/class/net
查看物理网卡信息返回结果如下:
eth1 lo
或者 #dmesg|grep eth
会发现eth0 rename成 eth1
原因:
很多Linux distribution使用udev动态管理设备文件，并根据设备的信息对其进行持久化命名。例如在
解决方法:
编辑如下文件
/etc/udev/rules.d/70-persistent-net.rules
一般文件内容是这样的:
# 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:bc:00:45", ATTR{type}=="1", KERNEL=="eth*", NAME="eth0"
# PCI device 0x15ad:0x07b0 (vmxnet3)
SUBSYSTEM=="net", ACTION=="add", DRIVERS=="?*", ATTR{address}=="00:50:56:bc:00:46", ATTR{type}=="1", KERNEL=="eth*", NAME="eth1"
注释掉eth0的那个段落,然后将eth1的修改为eth0
修改网卡配置文件
/etc/sysconfig/network-scripts/ifcfg-eth0
把mac地址修改为eth1的地址
HWADDR字段
重启后生效
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