CentOS7.4 系统安装好后，默认网卡名称为为ensXX，如ens33，如果要修改为eth0开头，之前文章描述手动更新配置步骤，此文章添加自动更新脚本：

1.创建自动化更新脚本

[root@centos7 ~]# vi centos7_changeNetName.sh

#!/bin/bash

name=$(ifconfig|grep ens|awk -F":" '{print $1}')

#echo $name

netName=ifcfg-$name

newName='eth0'

newNetName=ifcfg-$newName

####change ifcfg-xxx name

cd /etc/sysconfig/network-scripts

if [ -f $netName ];

then

  echo "$netName is exist."

  sed -i "s/NAME=$name/NAME=$newName/g" $netName

  echo $newNetName 

  mv $netName $newNetName

else

  echo "$netName is not exist!"

fi

#### change grub

cd /etc/default

if [ -f grub ];

then

    sed -i "s/quiet/quiet net.ifnames=0 biosdevname=0/g" /etc/default/grub

    grub2-mkconfig -o /boot/grub2/grub.cfg

else

    exit 1

fi

[root@centos7 ~]#

2.执行自动化更新脚本

[root@centos7 ~]# sh centos7_changeNetName.sh

ifcfg-ens33 is exist.

ifcfg-eth0

Generating grub configuration file ...

Found linux image: /boot/vmlinuz-3.10.0-693.el7.x86_64

Found initrd image: /boot/initramfs-3.10.0-693.el7.x86_64.img

Found linux image: /boot/vmlinuz-0-rescue-c15c0efab776454daa1c4da36ec768f6

Found initrd image: /boot/initramfs-0-rescue-c15c0efab776454daa1c4da36ec768f6.img

done

[root@centos7 ~]#

3.手动重启

因为实际环境不一定可以修改后直接重启，建议重启手动操作：

[root@centos7 ~]# reboot

4.验证网卡名

重启之后验证网卡名称:

[root@centos7 ~]# ifconfig

eth0: flags=4163<UP,BROADCAST,RUNNING,MULTICAST>  mtu 1500

        inet 192.168.155.104  netmask 255.255.255.0  broadcast 192.168.155.255

        inet6 fe80::df24:a2a1:5733:b35f  prefixlen 64  scopeid 0x20<link>

        ether 00:0c:29:c4:34:bd  txqueuelen 1000  (Ethernet)

        RX packets 113  bytes 11255 (10.9 KiB)

        RX errors 0  dropped 0  overruns 0  frame 0

        TX packets 152  bytes 17725 (17.3 KiB)

        TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0

lo: flags=73<UP,LOOPBACK,RUNNING>  mtu 65536

        inet 127.0.0.1  netmask 255.0.0.0

        inet6 ::1  prefixlen 128  scopeid 0x10<host>

        loop  txqueuelen 1  (Local Loopback)

        RX packets 0  bytes 0 (0.0 B)

        RX errors 0  dropped 0  overruns 0  frame 0

        TX packets 0  bytes 0 (0.0 B)

        TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0

virbr0: flags=4099<UP,BROADCAST,MULTICAST>  mtu 1500

        inet 192.168.122.1  netmask 255.255.255.0  broadcast 192.168.122.255

        ether 52:54:00:1a:02:e7  txqueuelen 1000  (Ethernet)

        RX packets 0  bytes 0 (0.0 B)

        RX errors 0  dropped 0  overruns 0  frame 0

        TX packets 0  bytes 0 (0.0 B)

        TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0

[root@centos7 ~]#