一.故障现象:
[root@c1node01 ~]# service network restart
Shutting 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 restart
Shutting 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-eth1
vim
sysconfig/network-scripts/ifcfg-eth1
修改DEVICE="eth0"
为DEVICE="eth1"
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="eth1"
#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,eth1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
………………
问题解决~!
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