Centos 配置eth0 提示Device does not seem to be present

一.故障现象：[root@c1node01 ~]# service network restartShutting down loopback insterface:[ OK ]Bringing up loopback insterface: [ OK ]Bringing up interface eth0: Device eth0 does not seem to be present,delaying initialization. [FAILED]解决办法：[root@c1node01 ~]# rm -rf /etc/udev/rules.d/70-persistent-net.rules[root@c1node01 ~]# reboot ………………[root@c1node01 ~]# service network restartShutting down loopback insterface:[ OK ]Bringing up loopback insterface: [ OK ]Bringing up interface eth0:[ OK ][root@c1node01 ~]#二.另一种方法造成这样的原因，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-eth2

vim
sysconfig/network-script免费云主机域名s/ifcfg-eth2

修改DEVICE=”eth0″
为DEVICE=”eth2″
可删掉uuid、物理地址

然后重启启动网卡尝试下三.比第一种更深入一点故障前的操作：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，并启动了刀片故障现象：启动后网络不通，通过iDRAC登录后route查看缺省路由正常；重启网络服务：[root@nodeA~]#servicenetworkrestart Shuttingdownloopbackinsterface:[OK] Bringinguploopbackinsterface:[OK] Bringingupinterfaceem1:Deviceem1doesnotseemtobepresent,delayinginitialization.[FAILED]分析问题和解决：之前在别的文章中我们提过70-persistent-net.rules文件，所以看了一下：[root@nodeA~]#vi/etc/udev/rules.d/70-persistent-net.rules#Thisfilewasautomaticallygeneratedbythe/lib/udev/write_net_rules #program,runbythepersistent-net-generator.rulesrulesfile. # #Youcanmodifyit,aslongasyoukeepeachruleonasingle #line,andchangeonlythevalueoftheNAME=key.#PCIdevice0x14e4:0x163a(bnx2) SUBSYSTEM==”net”,ACTION==”add”,DRIVERS==”?*”,ATTR{address}==”24:b6:fd:ab:76:1e”,ATTR{type}==”1″,KERNEL==”eth*”,NAME=”eth2″#PCIdevice0x14e4:0x163a(bnx2) SUBSYSTEM==”net”,ACTION==”add”,DRIVERS==”?*”,ATTR{address}==”24:b6:fd:ab:76:1c”,ATTR{type}==”1″,KERNEL==”eth*”,NAME=”eth0″发现NAME的名称不正确，依次将上述红色字体中的eth0改为em1，eth2改为em2；*切记：网卡编号由MAC地址大小决定，MAC越小网卡编号越小；如下：…………#PCIdevice0x14e4:0x163a(bnx2)SUBSYSTEM==”net”,ACTION==”add”,DRIVERS==”?*”,ATTR{address}==”24:b6:fd:ab:76:1e”,ATTR{type}==”1″,KERNEL==”eth*”,NAME=”em2″#PCIdevice0x14e4:0x163a(bnx2) SUBSYSTEM==”net”,ACTION==”add”,DRIVERS==”?*”,ATTR{address}==”24:b6:fd:ab:76:1c”,ATTR{type}==”1″,KERNEL==”eth*”,NAME=”em1″保存退出~！[root@nodeA~]#reboot………………

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