今天把硬盘移动到新主机上,系统和程序都OK,打开centos时发现没有网卡eth0,一番查找终于解决.@H_502_3@
下面转载来的:@H_502_3@
一.故障现象：@H_502_3@
[root@c1node01 ~]# service network restart@H_502_3@
Shutting down loopback insterface:[ OK ]@H_502_3@
Bringing up loopback insterface: [ OK ]@H_502_3@
Bringing up interface eth0: Device eth0 does not seem to be present,delaying initialization. [Failed]@H_502_3@
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[root@c1node01 ~]# rm -rf /etc/udev/rules.d/70-persistent-net.rules@H_502_3@
[root@c1node01 ~]# reboot ………………@H_502_3@
Bringing up loopback insterface: [ OK ]@H_502_3@
Bringing up interface eth0:[ OK ]@H_502_3@
[root@c1node01 ~]#@H_502_3@
@H_502_3@
造成这样的原因，是因为在虚拟机（Vmware）中移动了Centos系统对应的文件，导致重新配置时，网卡的MAC地址变了，输入ifconfig -a,找不到eth0@H_502_3@
・・・・・・・@H_502_3@
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安装完一个centos虚拟机，又拷贝一份，开机后网卡无法正常启动，报错：Device eth0 does not seem to be present,
delaying initialization
解决：# mv /etc/sysconfig/network-scripts/ifcfg-eth0
sysconfig/network-scripts/ifcfg-eth1
vim
sysconfig/network-scripts/ifcfg-eth1
修改DEVICE="eth0"
为DEVICE="eth1"@H_502_3@
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可删掉uuid、物理地址
然后重启启动网卡尝试下@H_502_3@
三.比第一种更深入一点@H_502_3@
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故障前的操作：@H_502_3@
DELL刀片装的是CentOS6.3的操作系统，网卡识别的是em1和em2，由于工作需要做了槽位调整，并启动了刀片@H_502_3@
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故障现象：@H_502_3@
启动后网络不通，通过iDRAC登录后route查看缺省路由正常；@H_502_3@
重启网络服务：@H_502_3@
[root@nodeA~]#servicenetworkrestart Shuttingdownloopbackinsterface:[OK] Bringinguploopbackinsterface:[OK] Bringingupinterfaceem1:Deviceem1doesnotseemtobepresent,delayinginitialization.[Failed]@H_502_3@
之前在别的文章中我们提过70-persistent-net.rules文件，所以看了一下：@H_502_3@
[root@nodeA~]#vi/etc/udev/rules.d/70-persistent-net.rules@H_502_3@
#Thisfilewasautomaticallygeneratedbythe/lib/udev/write_net_rules #program,runbythepersistent-net-generator.rulesrulesfile. # #Youcanmodifyit,aslongasyoukeepeachruleonasingle #line,andchangeonlythevalueoftheNAME=key.@H_502_3@
#PCIdevice0x14e4:0x163a(bnx2) SUBSYSTEM=="net",ACTION=="add",DRIVERS=="?*",ATTR{address}=="24:b6:fd:ab:76:1e",ATTR{type}=="1",KERNEL=="eth*",NAME="eth1"@H_502_3@
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发现NAME的名称不正确，依次将上述红色字体中的eth0改为em1，eth1改为em2；@H_502_3@
*切记：网卡编号由MAC地址大小决定，MAC越小网卡编号越小；@H_502_3@
如下：@H_502_3@
…………@H_502_3@
#PCIdevice0x14e4:0x163a(bnx2)@H_502_3@
SUBSYSTEM=="net",NAME="em2"@H_502_3@
