How to restore the network card em1 in the CentOS 6.2 system to Eth0

The first step : Modify the System Grub
vi/boot/grub/grub.conf

To add a biosdevname=0 startup parameter, I modified the result as follows:

[Email protected] ~]# cat/boot/grub/grub.conf 
# grub.conf generated by Anaconda
#
# Note that you don't have the to rerun grub after making changes to the This file
# notice:you does not have a/boot partition. This means
# all kernel and INITRD paths is relative to/, eg.
# root (hd0,0)
# kernel/boot/vmlinuz-version RO root=/dev/sda1
# initrd/boot/initrd-[generic-]version.img
#boot =/DEV/SDA
Default=0
Timeout=5
Splashimage= (hd0,0)/boot/grub/splash.xpm.gz
Hiddenmenu
Title CentOS (2.6.32-220.el6.x86_64)
Root (hd0,0)
kernel/boot/vmlinuz-2.6.32-220.el6.x86_64 ro root=uuid=360d089b-d466-4005-abcb-c5e517d31a96 Rd_NO_LUKS Rd_NO_LVM Lang=en_us.  UTF-8 rd_no_md quiet Sysfont=latarcyrheb-sun16 rhgb crashkernel=auto keyboardtype=pc keytable=us Rd_NO_DM biosdevname=0 #---> Here's a new addition.
Initrd/boot/initramfs-2.6.32-220.el6.x86_64.img

Step two : Delete udev configuration files rm-f/etc/udev/rules.d/70-persistent-net.rules

Note : The second step can be no action required.

Step three : Modify the name of the current NIC configuration file
MV Ifcfg-em1 Ifcfg-eth0
MV Ifcfg-em2 Ifcfg-eth1
MV Ifcfg-em3 Ifcfg-eth2
MV Ifcfg-em4 Ifcfg-eth3

Fourth Step : Modify the network card configuration file contents, change em1 all changes to eth0

[Email protected] ~]# Cat/etc/sysconfig/network-scripts/ifcfg-eth0
Device= "Eth0"
Bootproto= "DHCP"
Hwaddr= "24:b6:fd:f8:d5:84"
Nm_controlled= "Yes"
onboot= "Yes"

You can replace it with a command, as follows:

Perl-p-i-e ' s/em1/eth0/g ' ifcfg-eth0 or sed-i ' s/em1/eth0/g ' Ifcfg-eth0

Last step: Restart the system shutdown-r now you find that the familiar Eth0-eth4 has come back, by the way CentOS 6.2 has another problem is that if you do not write DNS in the network card configuration file, you will find/etc/after rebooting resolv.conf file is emptied, one way is to write DNS in the network card configuration file, another method is to give/etc/resolv.conf I attribute, chattr +i/etc/resolv.conf

How to restore the network card em1 in the CentOS 6.2 system to Eth0