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-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 ~]# service network restart Shutting down loopback insterface: [ OK ] Bringing up loopback insterface: [ OK ] Bringing up interface em1: Device em1 does not seem to be present,delaying initialization. [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

# 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 0x14e4:0x163a (bnx2) SUBSYSTEM==”net”, ACTION==”add”, DRIVERS==”?*”, ATTR{address}==”24:b6:fd:ab:76:1e”, ATTR{type}==”1″, KERNEL==”eth*”, NAME=”eth1″

# PCI device 0x14e4:0x163a (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:

…………

# PCI device 0x14e4:0x163a (bnx2)

SUBSYSTEM==”net”, ACTION==”add”, DRIVERS==”?*”, ATTR{address}==”24:b6:fd:ab:76:1e”, ATTR{type}==”1″, KERNEL==”eth*”, NAME=”em2″

# PCI device 0x14e4:0x163a (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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