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在执行network服务重启后，出现Device eth0 does not seem to be present 问题，主要是因为系统之前有多个网卡配置，和配置文件不匹配造成的。
解决这种问题，思路是先看系统网卡配置文件中目前的配置情况，然后再在网络配置文件中修改相应的配置
具体现象：
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：
1、查看网络配置文件
cat /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 0x8086:0x100f (e1000) SUBSYSTEM=="net", ACTION=="add", DRIVERS=="?*", ATTR{address}=="00:0c:29:6f:02:c2", ATTR{type}=="1", KERNEL=="eth*", NAME="eth0" # PCI device 0x8086:0x100f (e1000) SUBSYSTEM=="net", ACTION=="add", DRIVERS=="?*", ATTR{address}=="00:0c:29:d0:74:01", ATTR{type}=="1", KERNEL=="eth*", NAME="eth1" # PCI device 0x8086:0x100f (e1000) SUBSYSTEM=="net", ACTION=="add", DRIVERS=="?*", ATTR{address}=="00:0c:29:bc:4e:d6", ATTR{type}=="1", KERNEL=="eth*", NAME="eth2" # PCI device 0x8086:0x100f (e1000) SUBSYSTEM=="net", ACTION=="add", DRIVERS=="?*", ATTR{address}=="00:0c:29:78:35:ae", ATTR{type}=="1", KERNEL=="eth*", NAME="eth3"
在使用ifconfig命令执行后，显示的网卡为最后一个eth3，现在我们不需要eth3,想改回eth0。在/etc/sysconfig/network-scripts/文件夹中只有ifcfg-eth0
# 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 0x8086:0x100f (e1000) #SUBSYSTEM=="net", ACTION=="add", DRIVERS=="?*", ATTR{address}=="00:0c:29:6f:02:c2", ATTR{type}=="1", KERNEL=="eth*", NAME="eth0" # PCI device 0x8086:0x100f (e1000) #SUBSYSTEM=="net", ACTION=="add", DRIVERS=="?*", ATTR{address}=="00:0c:29:d0:74:01", ATTR{type}=="1", KERNEL=="eth*", NAME="eth1" # PCI device 0x8086:0x100f (e1000) #SUBSYSTEM=="net", ACTION=="add", DRIVERS=="?*", ATTR{address}=="00:0c:29:bc:4e:d6", ATTR{type}=="1", KERNEL=="eth*", NAME="eth2" # PCI device 0x8086:0x100f (e1000) SUBSYSTEM=="net", ACTION=="add", DRIVERS=="?*", ATTR{address}=="00:0c:29:78:35:ae", ATTR{type}=="1", KERNEL=="eth*", NAME="eth0"
最后条记录是目前在用的网卡的数据，包括mac地址信息，需要把最后一条的网卡名称从eth3,改成eth0，然后修改ifcfg-eth0
DEVICE="eth0" BOOTPROTO="static" HWADDR="00:0c:29:78:35:ae" IPV6INIT="yes" NM_CONTROLLED="yes" ONBOOT="yes" TYPE="Ethernet" NETMASK=255.255.255.0 IPADDR=192.168.114.128 GATEWAY=192.168.114.1
吧hwaddr改成70-persistent-net.rules文件中最后一条记录的mac地址。
重启修改成功。
注意：
如果没有关闭NetworkManager，则需要关闭
service NetworkManager stop
chkconfig NetworkManager off
CentOS 下网络报错 Device eth0 does not seem to be present
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原文地址：http://www.cnblogs.com/qpanda/p/5112831.html
