我的博客已迁移到xdoujiang.com请去那边和我交流让机房工程师安装CentOS 6.5系统(最小化安装)后发现网卡名字都是em开头的ifconfig em1 Link encap:Ethernet HWaddr 84:2B:2B:0C:FF:07 inet addr:2.2.2.2 Bcast:2.2.2.255 Mask:255.255.255.0 inet6 addr: fe80::862b:2bff:fe0c:ff07/64 Scope:Link UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1 RX packets:3195 errors:0 dropped:0 overruns:0 frame:0 TX packets:29 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:1000 RX bytes:208130 (203.2 KiB) TX bytes:1964 (1.9 KiB) Interrupt:36 Memory:da000000-da012800 em2 Link encap:Ethernet HWaddr 84:2B:2B:0C:FF:08 inet addr:1.1.1.1 Bcast:1.1.1.255 Mask:255.255.255.0 inet6 addr: fe80::862b:2bff:fe0c:ff08/64 Scope:Link UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1 RX packets:2867 errors:0 dropped:0 overruns:0 frame:0 TX packets:105 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:1000 RX bytes:242782 (237.0 KiB) TX bytes:15539 (15.1 KiB) Interrupt:48 Memory:dc000000-dc012800 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:16436 Metric:1 RX packets:0 errors:0 dropped:0 overruns:0 frame:0 TX packets:0 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:0 RX bytes:0 (0.0 b) TX bytes:0 (0.0 b) 查看配置文件ll /etc/sysconfig/network-scripts/-rw-r--r--. 1 root root 233 May 27 17:33 ifcfg-em1-rw-r--r--. 1 root root 266 May 27 17:26 ifcfg-em2查看设备管理文件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 0x14e4:0x163b (bnx2) (custom name provided by external tool)SUBSYSTEM=="net", ACTION=="add", DRIVERS=="?*", ATTR{address}=="84:2b:2b:0c:ff:07", ATTR{type}=="1", KERNEL=="eth*", NAME="em1"# PCI device 0x14e4:0x163b (bnx2) (custom name provided by external tool)SUBSYSTEM=="net", ACTION=="add", DRIVERS=="?*", ATTR{address}=="84:2b:2b:0c:ff:08", ATTR{type}=="1", KERNEL=="eth*", NAME="em2"解决方法有2个一、通过重命名配置文件名字和删除/etc/udev/rules.d/70-persistent-net.rules文件1、重命名mv /etc/sysconfig/network-scripts/ifcfg-em1 /etc/sysconfig/network-scripts/ifcfg-eth0mv /etc/sysconfig/network-scripts/ifcfg-em2 /etc/sysconfig/network-scripts/ifcfg-eth1 2、分别修改配置文件内容cat /etc/sysconfig/network-scripts/ifcfg-eth0DEVICE="eth0"cat /etc/sysconfig/network-scripts/ifcfg-eth1DEVICE="eth1"3、删除/etc/udev/rules.d/70-persistent-net.rules文件rm -f /etc/udev/rules.d/70-persistent-net.rules4、重启机器就行了reboot以下文字摘自pdfReverting to the traditional "ethN" naming scheme In case you have a system with the new naming scheme and would like to revert to the traditional naming scheme:1）Rename all ifcfg-emN and ifcfg-p* configuration files and modify the contents of the files accordingly.The content of these files is distribution specific (see /usr/share/doc/initscripts- for details) As an example ifcfg-ethN files in RHEL6.1 contain a "DEVICE=" field which will be assigned with the emN name.Modify it to suit the new naming scheme such as "DEVICE=eth0".2）Comment the HWADDR variable in the ifcfg-eth* files if present as it is not possible to predict here which of the net work devices will be named eth0, eth1 etc.3）Reboot the system4）Login and you should see the ethN names.The 70-persistent-net.rules file will be created under /etc/udev/rules.d/ to make the names persistent across reboots.二、通过修改grub参数来关闭命名新规则在参数后面增加1个这样的参数就行了 biosdevname=0其他和上面一致以下文字摘自pdf1)Enable/disable the new naming schemeIf you choose not to use the new naming scheme, it can be turned offduring install time or post-install time.During install timeTo disable the use of the new naming scheme,during installation(attended or automated),pass the kernel command line parameter biosdevname=0 on the boot command line.The parameter should be passed on the boot command line after installation to ensure that a new network adapter plugged in post installation has a traditional "eth" name.Consistent Network Device Naming in LinuxNote: On SLES 11 SP2 biosdevname=0 needs to be passed to boot command line only during installation. Certain distributions (see Table 1) have enabled the new naming scheme on all Dell systems by default and disabled for others. If you choose to use the new naming scheme on non-Dell systems with such distributions, set biosdevname=1 in the kernel command line during install.三、参考http://linux.dell.com/files/whitepapers/consistent_network_device_naming_in_linux.pdf