CentOS 下网络报错 Device eth0 does not seem to be present

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