CentOS 6 报错 Bringing up interface eth0

今天启动 CentOS 6 发现 IP 自动改变了，网卡设备名称也变成了 eth1。
重启 网卡提示以下报错

Bringing up interface eth0:  Device eth0 does not seem to be present, delaying initialization.
                                                                                      [FAILED]

问题状态：
1、通过查看 IP 信息发现以前使用的 eth0 变成 eth1，可能是网卡有变动

[root@hexingxing ~]# ifconfig
eth1      Link encap:Ethernet  HWaddr 00:0C:29:02:E8:FB
inet addr:10.0.1.123  Bcast:10.0.1.255  Mask:255.255.255.0
inet6 addr: fe80::20c:29ff:fe02:e8fb/64 Scope:Link
UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
RX packets:167 errors:0 dropped:0 overruns:0 frame:0
TX packets:18 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:13868 (13.5 KiB)  TX bytes:1943 (1.8 KiB)

lo        Link encap:Local Loopback
inet addr:127.0.0.1  Mask:255.0.0.0
inet6 addr: ::1/128 Scope:Host
UP LOOPBACK RUNNING  MTU:65536  Metric:1
RX packets:16 errors:0 dropped:0 overruns:0 frame:0
TX packets:16 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:0
RX bytes:960 (960.0 b)  TX bytes:960 (960.0 b)

2、查看网卡设备网络规则文件

[root@hexingxing ~]# 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:29:67:ee:c7", ATTR{type}=="1", KERNEL=="eth*", NAME="eth0"

# PCI device 0x8086:0x100f (e1000)
SUBSYSTEM=="net", ACTION=="add", DRIVERS=="?*", ATTR{address}=="00:0c:29:02:e8:fb", ATTR{type}=="1", KERNEL=="eth*", NAME="eth1"

问题描述：
1、通过查看网卡设备网络规则文件确认是有 eth1，说明是之前手动配置 IP 信息的 eth0 失效了，系统自动启用了 eth1 并使用 DHCP 自动获取 IP。
2、此时我们只要将原来的 eth0 配置为 eth1 的相关信息并启用 eth1 即可解决该问题。

解决方案：
1、将原来的 ifcfg-eth0 文件修改为 ifcfg-eth1

[root@hexingxing network-scripts]# mv ifcfg-eth0 ifcfg-eth1

[root@hexingxing network-scripts]# ls ##查看是否修改成功
ifcfg-eth1   ifdown-ippp    ifdown-sit     ifup-ib     ifup-post      init.ipv6-global
ifcfg-lo     ifdown-ipv6    ifdown-tunnel  ifup-ippp   ifup-ppp       net.hotplug
ifdown       ifdown-isdn    ifup           ifup-ipv6   ifup-routes    network-functions
ifdown-bnep  ifdown-post    ifup-aliases   ifup-isdn   ifup-sit       network-functions-ipv6
ifdown-eth   ifdown-ppp     ifup-bnep      ifup-plip   ifup-tunnel
ifdown-ib    ifdown-routes  ifup-eth       ifup-plusb  ifup-wireless

2、在 ifcfg-eth1 文件中将 DEVICE="eth0" 修改为 DEVICE="eth1"

[root@hexingxing network-scripts]# cat ifcfg-eth1
DEVICE="eth1" ##将之前的 eth0 改为 eth1
BOOTPROTO="static"
HWADDR="00:0C:29:67:EE:C7"
IPV6INIT="yes"
NM_CONTROLLED="yes"
ONBOOT="yes"
TYPE="Ethernet"
UUID="536203db-b01e-4646-b622-23ce22265d50"
IPADDR=10.0.1.85
NETMASK=225.225.225.0
GATEWAY=10.0.1.255

3、重启网卡，解决问题。

[root@hexingxing network-scripts]# service network restart
Shutting down interface eth1:                              [  OK  ]
Shutting down loopback interface:                          [  OK  ]
Bringing up loopback interface:                            [  OK  ]
Bringing up interface eth1:  Determining if ip address 10.0.1.85 is already in use for device eth1...
                                                           [  OK  ]