Centos 7 rename ethernet interface

Problem: By default Centos 7 assigns a clumsy device name to the Ethernet interface

Resolution: Assign a different device name to the interface

Update: June 2018

CentOS 7.5 build 1804. A further file is implicated by udev and will override the earlier methods of renaming interfaces

/etc/udev/rules.d/90-eno-fix.rules

#This file was automatically generated on systemd update

SUBSYSTEM=="net", ACTION=="add", DRIVERS=="?*", ATTR={address}=="00:11:22:33:44:55", NAME="em1"

Update: March 2017

Centos 7.3 the most straight forward method appears to be as follows

Assume the Ethernet interface has been assigned a device name of eno1780032

ip link set eno1780032 down

ip link set eno1780032 name em1

ip link set em1 up

The name change can be verified with the commands, ip link, nmcli c but will not persist a reboot

To make the change persistent create the ifcfg- script using nmtui to change the NetworkManager connection profile name, to Ethernet1

cd /etc/sysconfig/network-scripts

cp ifcfg-Ethernet1 ifcfg-em1

nano ifcfg-em1

HWADDR=00:11:22:33:44:55   #Your Ethernet mac address

DEVICE=em1

TYPE=Ethernet

BOOTPROTO=dhcp

DEFROUTE=yes

PEERDNS=yes

IPV4_FAILURE_FATAL=yes

IPV6INIT=no

NAME=Ethernet1    #NetworkManager profile name

UUID=4f95e671-6cd0-473a-odc3-a1b9eefa9cce    #NetworkManager assigned UUID

ONBOOT=yes

Save the file and disable the script created by nmtui

mv ifcfg-Ethernet1 old-ifcfg-Ethernet1

Reboot

After reboot verify the interface is operating with the correct device name with

ip addr

End

Previous instructions deprecated by Centos 7.3

By default, Centos (RHEL) 7 uses a new interface naming convention, whereby the first subnet octet may be used as the postfix

ens192

There are a number of ways to rename the interface however, the most straightforward method is to edit the udev device mapper rules which are read during boot up.

Example: Rename the ens192 interface to em1

Command: nano /usr/lib/udev/rules.d/60-net.rules

Edit the default entry

ACTION=="add", SUBSYSTEM=="net", DRIVERS=="?*", ATTR{type}=="1", PROGRAM="/lib/udev/rename_device", RESULT=="?*", NAME="$result"

As follows

ACTION=="add", SUBSYSTEM=="net", DRIVERS=="?*", ATTR{type}=="1", PROGRAM="/lib/udev/rename_device", NAME="em1"

Save and reboot

Additional

rename the ifcfg-eno... file in /etc/sysconfig/networ-scripts/

mv ifcfg-eno... ifcfg-em1

nano ifcfg-em1

TYPE=Ethernet

DEVICE=em1

NAME="System em1"

HWADDR=00:11:22:33:44:55  #your mac address here

BOOTPROTO=dhcp

ONBOOT=yes

DEFROUTE=yes

IPV4_FAILURE_FATAL=yes

IPV6INIT=no

IPV6_AUTOCONF=no

IPV6_FAILURE_FATAL=no

PEERROUTES=yes

IPV6_PEERDNS=no

IPV6_PEERROUTES=no

IPV6_PRIVACY=no

Save and reboot