现象:将在另一台电脑虚拟机上安装的linux系统文件整个拷贝到本机上,使用时发现执行网卡重启命令时出现如下错误:
[root@localhost Desktop]# service network
restart
Shutting down loopback interface: [ OK ]
Bringing up loopback interface: [ OK ]
Bringing up interface eth0: Error: No suitable device found: no device
found for connection 'System eth0'.
[FAILED]
而且执行ifconfig显示的是eth1网卡,但/etc/sysconfig/network-script下只有eth0,没有eth1
产生这个问题的原因是虚拟机分配给操作系统的虚拟网卡MAC地址是不一样的。第一个系统的网卡MAC地址记录在了/etc/udev/rules.d/70-persistent-net.rules,命名为eth0。新克隆分配的系统的网卡MAC地址也记录在了该文件当中,与之前的系统一样,因此有了冲突。
可以查看一下两个机子的这个70-persistent-net.rules文件的内容
第一个系统:
[root@localhost rules.d]# cat
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.
# PCI device 0x1022:0x2000 (pcnet32)
SUBSYSTEM=="net",
ACTION=="add", DRIVERS=="?*",
ATTR{address}=="00:0c:29:f4:95:e3", ATTR{type}=="1",
KERNEL=="eth*", NAME="eth0"
克隆后的系统:
[root@localhost rules.d]# cat
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.
# PCI device 0x1022:0x2000 (pcnet32)
SUBSYSTEM=="net", ACTION=="add",
DRIVERS=="?*", ATTR{address}=="00:0c:29:f4:95:e3",
ATTR{type}=="1", KERNEL=="eth*", NAME="eth1"
我们可以看到这两个系统中的MAC地址一样。
问题解决方法:
删除克隆后这个系统中的/etc/udev/rules.d/70-persistent-net.rules文件,重启后系统会重新生成一个新的虚拟网卡MAC地址,然后把这个文件里NAME="eth1"的eth1改成eth0,同时也要修改ATTR{address}里的mac地址和/etc/sysconfig/network-scripts/ifcfg-eth0文件mac地址,并与新的虚拟网卡MAC地址保持一致。
如:将原文件的
SUBSYSTEM=="net",
ACTION=="add", DRIVERS=="?*",
ATTR{address}=="00:0c:29:f4:95:e3", ATTR{type}=="1",
KERNEL=="eth*", NAME="eth1"
改为SUBSYSTEM=="net", ACTION=="add",
DRIVERS=="?*", ATTR{address}=="00:0c:29:5c:65:b7",
ATTR{type}=="1", KERNEL=="eth*", NAME="eth0"
修改/etc/sysconfig/network-scripts/ifcfg-eth0文件
DEVICE="eth0"
IPV6INIT="yes"
NM_CONTROLLED="yes"
ONBOOT="yes"
TYPE="Ethernet"
UUID="05944003-ae77-4c9d-9e58-3ec2851db71d"
DEFROUTE=yes
IPV4_FAILURE_FATAL=yes
IPV6_AUTOCONF=yes
IPV6_DEFROUTE=yes
IPV6_FAILURE_FATAL=no
NAME="System eth0"
HWADDR=00:0c:29:5c:65:b7
然后重启网络服务,发现一切正常了。
[root@localhost Desktop]# service network
restart
Shutting down interface eth0: Device state: 3 (disconnected)
[ OK ]
Shutting down loopback interface: [ OK ]
Bringing up loopback interface: [ OK ]
Bringing up interface eth0: Active connection state: activating
Active connection path:
/org/freedesktop/NetworkManager/ActiveConnection/1
state: activated
Connection activated [
OK ]