Names to Consistent Device Names for Ethernet Devices in Red Hat® Enterprise Linux® v6
6
Here is a sample output from above, where the first column is the current kernel assigned
device name for the interface, column two is the firmware suggested name, and the third
column is the assigned MAC address of the device. Save this output for use after you upgrade
the system.
eth0 em1 84:2B:2B:4C:63:91
eth1 em2 84:2B:2B:4C:63:92
This mapping helps with the subsequent sections where you apply the new mapping to the
network configuration.
Migrating the configuration from an old naming to the new naming scheme
A system installed with Red Hat Enterprise Linux version 6.1 or later by default uses the new naming
scheme on supported Dell systems. With the help of the map created above, make sure that
configuration settings are as required.
1. Install the destination operating system making sure consistent device naming is enabled (it is
enabled by default on all supported Dell systems).
2. Using the map created from above:
a. Make sure that all the ifcfg-emX and ifcfg-pXpY files in /etc/sysconfig/network-scripts
contain the configuration as required by your deployment.
b. If your firewall rules contained device specific rules, edit the firewall configuration to
reflect the same, but using the newer names instead of the ethN names.
c. Update other files that contain references to the older ethN names.
3. Reboot and make sure that network devices, services and firewall rules start up as expected.
Upgrade
In this section, we demonstrate how the configuration on a system upgraded to Red Hat Enterprise
Linux version 6.1 (or later) is configured to use the new naming scheme. The operating system’s
upgrade program preserves older ethN names and requires that we change all references to the older
names with the newer names.
1. Upgrade to the destination operating system using the Red Hat documentation. If your previous
install used the traditional naming scheme, post upgrade, the system continues to use the
traditional naming (or same) scheme.
2. Find all configuration files that might use the (traditional ethN) naming scheme. For example:
# find /etc -type f -exec grep -l eth[0-9] '{}' \;
3. With the help of the map created above, rename each occurrence of the ethN name with the
corresponding emX or pXpY name in all configuration files and/or file names. For network
device configuration, do this:
Manually, or
with the system-config-network-cmd utility.
There is a sample script that you can use, see the Sample Scripts section.
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