RHEL6虚拟机克隆网络问题解决方法

时间:2016-04-08 00:54来源:linux.it.net.cn 作者:IT
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)
 
Virtualbox有这个问题,VMWARE克隆虚拟机应该也是有这个问题的。


(责任编辑:IT)
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