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

文章转载于：http://www.2cto.com/os/201305/215678.html 

 

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。