呼叫中心专家 focustar.net
RHEL6.3克隆虚拟机后的网卡启动失败问题解析
公司测试环境安装的都是RHEL6.3,在进行虚拟机克隆后,发现clone的虚拟机网卡起不来,具体报如下错误:
[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]
当你执行ifconfig命令的时候,会发现显示eth1网卡的配置文件却为/etc/sysconfig/network-scripts/ifcfg-eth0。
[root@localhost network-scripts]# ifconfig|grep addr eth1 Link encap:Ethernet HWaddr 00:0c:29:f4:95:e3 inet6 addr: fe80::20c:29ff:fe5c:65b7/64 Scope:Link Interrupt:19 Base address:0x2024 inet addr:127.0.0.1 Mask:255.0.0.0 inet6 addr: ::1/128 Scope:Host [root@localhost network-scripts]# ls
ifcfg-eth0 ifdown-isdn ifup-aliases ifup-plusb init.ipv6-global ifcfg-lo ifdown-post ifup-bnep ifup-post net.hotplug ifdown ifdown-ppp ifup-eth ifup-ppp network-functions ifdown-bnep ifdown-routes ifup-ippp ifup-routes network-functions-ipv6
呼叫中心专家 focustar.net
ifdown-eth ifdown-sit ifup-ipv6 ifup-sit ifdown-ippp ifdown-tunnel ifup-isdn ifup-tunnel ifdown-ipv6 ifup ifup-plip ifup-wireless [root@localhost network-scripts]#
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:
呼叫中心专家 focustar.net
[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"
呼叫中心专家 focustar.net
改为 SUBSYSTEM=="net", ACTION=="add", DRIVERS=="?*",
ATTR{address}=="00:0c:29:5c:65:b7"