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一.故障現象:
[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]
解決辦法:
[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.另一種方法
造成這樣的原因,是因為在虛擬機(Vmware)中移動了Centos系統對應的文件,導致重新配置時,網卡的MAC地址變了,輸入ifconfig -a,找不到eth0
·······
安裝完一個centos虛擬機,又拷貝一份,開機后網卡無法正常啟動,報錯:Device eth0 does not seem to be present,
delaying initialization
解決:# mv /etc/sysconfig/network-scripts/ifcfg-eth0
sysconfig/network-scripts/ifcfg-eth2
vim
sysconfig/network-scripts/ifcfg-eth2
修改DEVICE="eth0"
為DEVICE="eth2"
可刪掉uuid、物理地址
然后重啟啟動網卡嘗試下
三.比第一種更深入一點
故障前的操作:
DELL刀片裝的是CentOS6.3的操作系統,網卡識別的是em1和em2,由于工作需要做了槽位調整,并啟動了刀片
故障現象:
啟動后網絡不通,通過iDRAC登錄后route查看缺省路由正常;
重啟網絡服務:
[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]
分析問題和解決:
之前在別的文章中我們提過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="eth2"
# 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"
發現NAME的名稱不正確,依次將上述紅色字體中的eth0改為em1,eth2改為em2;
*切記:網卡編號由MAC地址大小決定,MAC越小網卡編號越小;
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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