Device eth0 does not seem to be present, delaying initialization. 的解决方法
[b]现象：[/b]service network restart时，提示：[quote]Device eth0 does not seem to be present, delaying initialization.[/quote]
[b]解决：[/b]
删除 /etc/udev/rules.d/70-persistent-net.rules 后重启机器。
注：70-persistent-net.rules这个文件确定了网卡与MAC地址的绑定，导入已经存在的虚拟机后，但网卡的MAC地址发生了变化，所以导致系统认为网络设备不存在。
经过这样的处理后eth0还不能正常启动，需要将 /etc/udev/rules.d/70-persistent-net.rules 文件最后的"eth1"修改为"eth0"，然后将/etc/sysconfig/network-scripts/ifcfg-eth0中的MAC地址修改为 /etc/udev/rules.d/70-persistent-net.rules文件中所记录的地址，再重启机器，eth0可以正常启动了。 [align=left][color=#000][font=Verdana, Geneva, Arial, Helvetica, sans-serif][size=18px]一.[color=#454545][font=tahoma, helvetica, arial][b]故障现象：[/b][/font][/color][/size][/font][/color][/align][align=left][color=#000][font=Verdana, Geneva, Arial, Helvetica, sans-serif][color=#454545][font=tahoma, helvetica, arial][size=18px][root@c1node01 ~]# service network restart[/size][/font][/color][/font][/color][/align][align=left][color=#000][font=Verdana, Geneva, Arial, Helvetica, sans-serif][color=#454545][font=tahoma, helvetica, arial][size=18px]Shutting down loopback insterface: [ OK ][/size][/font][/color][/font][/color][/align][align=left][color=#000][font=Verdana, Geneva, Arial, Helvetica, sans-serif][color=#454545][font=tahoma, helvetica, arial][size=18px]Bringing up loopback insterface: [ OK ][/size][/font][/color][/font][/color][/align][align=left][color=#000][font=Verdana, Geneva, Arial, Helvetica, sans-serif][color=#454545][font=tahoma, helvetica, arial][size=18px]Bringing up interface eth0: Device eth0 does not seem to be present,delaying initialization. [FAILED][/size][/font][/color][/font][/color][/align][align=left][color=#000][font=Verdana, Geneva, Arial, Helvetica, sans-serif]
[/font][/color][/align][align=left][color=#000][font=Verdana, Geneva, Arial, Helvetica, sans-serif][color=#454545][font=tahoma, helvetica, arial][b][size=18px]解决办法：[/size][/b][/font][/color][/font][/color][/align][align=left][color=#000][font=Verdana, Geneva, Arial, Helvetica, sans-serif][color=#454545][font=tahoma, helvetica, arial][size=18px][root@c1node01 ~]# rm -rf /etc/udev/rules.d/70-persistent-net.rules[/size][/font][/color][/font][/color][/align][align=left][color=#000][font=Verdana, Geneva, Arial, Helvetica, sans-serif][size=18px][color=#454545][font=tahoma, helvetica, arial][root@c1node01 ~][/font][/color][color=#454545][font=tahoma, helvetica, arial]# reboot ………………[/font][/color][/size][/font][/color][/align][align=left][color=#000][font=Verdana, Geneva, Arial, Helvetica, sans-serif][color=#454545][font=tahoma, helvetica, arial][size=18px][root@c1node01 ~]# service network restart[/size][/font][/color][/font][/color][/align][align=left][color=#000][font=Verdana, Geneva, Arial, Helvetica, sans-serif][color=#454545][font=tahoma, helvetica, arial][size=18px]Shutting down loopback insterface: [ OK ][/size][/font][/color][/font][/color][/align][align=left][color=#000][font=Verdana, Geneva, Arial, Helvetica, sans-serif][color=#454545][font=tahoma, helvetica, arial][size=18px]Bringing up loopback insterface: [ OK ][/size][/font][/color][/font][/color][/align][align=left][color=#000][font=Verdana, Geneva, Arial, Helvetica, sans-serif][size=18px][color=#454545][font=tahoma, helvetica, arial]B[/font][/color][color=#454545][font=tahoma, helvetica, arial]ringing up interface eth0: [ OK ][/font][/color][/size][/font][/color][/align][align=left][color=#000][font=Verdana, Geneva, Arial, Helvetica, sans-serif][color=#454545][font=tahoma, helvetica, arial][size=18px][root@c1node01 ~]#[/size][/font][/color][/font][/color][/align][align=left][color=#000][font=Verdana, Geneva, Arial, Helvetica, sans-serif]
[/font][/color][/align][align=left][color=#000][font=Verdana, Geneva, Arial, Helvetica, sans-serif][b][color=#454545][font=tahoma, helvetica, arial][size=18px]二.另一种方法[/size][/font][/color][/b][/font][/color][/align][align=left][color=#000][font=Verdana, Geneva, Arial, Helvetica, sans-serif][color=#454545][font=tahoma, helvetica, arial][size=18px]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[/size][/font][/color][/font][/color][/align][align=left][color=#000][font=Verdana, Geneva, Arial, Helvetica, sans-serif][color=#454545][font=tahoma, helvetica, arial][size=18px]·······[/size][/font][/color][/font][/color][/align][align=left][color=#000][font=Verdana, Geneva, Arial, Helvetica, sans-serif]
[/font][/color][/align][align=left][color=#000][font=Verdana, Geneva, Arial, Helvetica, sans-serif][color=#454545][font=tahoma, helvetica, arial][size=18px]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"[/size][/font][/color][/font][/color][/align][align=left][color=#000][font=Verdana, Geneva, Arial, Helvetica, sans-serif][color=#454545][font=tahoma, helvetica, arial]
[/font][/color][/font][/color][/align][align=left][color=#000][font=Verdana, Geneva, Arial, Helvetica, sans-serif][color=#454545][font=tahoma, helvetica, arial][size=18px]可删掉uuid、物理地址
然后重启启动网卡尝试下[/size][/font][/color][/font][/color][/align][align=left][color=#000][font=Verdana, Geneva, Arial, Helvetica, sans-serif]
[/font][/color][/align][align=left][color=#000][font=Verdana, Geneva, Arial, Helvetica, sans-serif][b][color=#454545][font=tahoma, helvetica, arial][size=18px]三.比第一种更深入一点[/size][/font][/color][/b][/font][/color][/align][align=left][color=#000][font=Verdana, Geneva, Arial, Helvetica, sans-serif]
[/font][/color][/align][align=left][color=#000][font=Verdana, Geneva, Arial, Helvetica, sans-serif]
[indent][p=30, 2, left][size=18px]故障前的操作：[/size][/p][p=30, 2, left][size=18px]DELL刀片装的是CentOS6.3的[url=http://lib.csdn.net/base/operatingsystem]操作系统[/url]，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[/size][/p][/indent][p=30, 2, left]
[/p][p=30, 2, left][size=18px]故障现象：[/size][/p][p=30, 2, left][size=18px]启动后网络不通，通过iDRAC登录后route查看缺省路由正常；[/size][/p][p=30, 2, left][size=18px]重启网络服务：[/size][/p][p=30, 2, left][size=18px][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][/size][/p][p=30, 2, left]
[/p][p=30, 2, left][size=18px]分析问题和解决：[/size][/p][p=30, 2, left][size=18px]之前在别的文章中我们提过70-persistent-net.rules文件，所以看了一下：[/size][/p][p=30, 2, left][size=18px][root@nodeA ~]# vi /etc/udev/rules.d/70-persistent-net.rules[/size][/p][p=30, 2, left][size=18px]# 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.[/size][/p][p=30, 2, left][size=18px]# 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"[/size][/p][p=30, 2, left][size=18px]# 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"[/size][/p][p=30, 2, left][size=18px]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；[/size][/p][p=30, 2, left][size=18px]*切记：网卡编号由MAC地址大小决定，MAC越小网卡编号越小；[/size][/p][p=30, 2, left][size=18px]如下：[/size][/p][p=30, 2, left][size=18px]…………[/size][/p][p=30, 2, left][size=18px]# PCI device 0x14e4:0x163a (bnx2)[/size][/p][p=30, 2, left][size=18px]SUBSYSTEM=="net", ACTION=="add", DRIVERS=="?*", ATTR{address}=="24:b6:fd:ab:76:1e", ATTR{type}=="1", KERNEL=="eth*", NAME="em2"[/size][/p][p=30, 2, left][size=18px]# 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"[/size][/p][p=30, 2, left][size=18px]保存退出~！[/size][/p][p=30, 2, left][size=18px][root@nodeA ~]#reboot[/size][/p][p=30, 2, left][size=18px]………………[/size][/p][p=30, 2, left][size=18px]问题解决~！[/size][/p][/font][/color][/align]
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