Bug 1374241

Summary: interface name changed after reboot
Product: Red Hat Enterprise Linux 7 Reporter: Jun Hu <juhu>
Component: systemdAssignee: systemd-maint
Status: CLOSED CANTFIX QA Contact: qe-baseos-daemons
Severity: medium Docs Contact:
Priority: unspecified    
Version: 7.2CC: systemd-maint-list, udev-maint-list
Target Milestone: rc   
Target Release: ---   
Hardware: x86_64   
OS: Linux   
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Fixed In Version: Doc Type: If docs needed, set a value
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Clone Of: Environment:
Last Closed: 2016-09-09 14:56:14 UTC Type: Bug
Regression: --- Mount Type: ---
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Verified Versions: Category: ---
oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
Cloudforms Team: --- Target Upstream Version:

Description Jun Hu 2016-09-08 10:08:11 UTC 
Description of problem:
interface name changed in a kvm vm after reboot

Version-Release number of selected component (if applicable):
host:

[root@host0 log]# rpm -qa | grep udev 
python-gudev-147.2-7.el7.x86_64
libgudev1-219-19.el7.x86_64
python-pyudev-0.15-6.el7.noarch
[root@host0 log]# rpm -qa | grep libvirt 
libvirt-daemon-driver-interface-1.2.8-16.el7_1.4.x86_64
libvirt-daemon-driver-nwfilter-1.2.8-16.el7_1.4.x86_64
libvirt-daemon-driver-lxc-1.2.8-16.el7_1.4.x86_64
libvirt-client-1.2.8-16.el7_1.4.x86_64
libvirt-daemon-driver-storage-1.2.8-16.el7_1.4.x86_64
libvirt-daemon-driver-network-1.2.8-16.el7_1.4.x86_64
libvirt-gobject-0.1.7-3.el7.x86_64
libvirt-glib-0.1.7-3.el7.x86_64
libvirt-daemon-config-network-1.2.8-16.el7_1.4.x86_64
libvirt-daemon-kvm-1.2.8-16.el7_1.4.x86_64
libvirt-daemon-driver-secret-1.2.8-16.el7_1.4.x86_64
libvirt-1.2.8-16.el7_1.4.x86_64
fence-virtd-libvirt-0.3.2-1.el7.x86_64
libvirt-daemon-driver-qemu-1.2.8-16.el7_1.4.x86_64
libvirt-daemon-config-nwfilter-1.2.8-16.el7_1.4.x86_64
libvirt-daemon-1.2.8-16.el7_1.4.x86_64
libvirt-gconfig-0.1.7-3.el7.x86_64
libvirt-python-1.2.8-7.el7_1.1.x86_64
libvirt-daemon-driver-nodedev-1.2.8-16.el7_1.4.x86_64

vm:
[root@rhv-h network-scripts]# rpm -q udev
package udev is not installed
[root@rhv-h network-scripts]# rpm -qa | grep udev 
libgudev1-219-19.el7_2.12.x86_64
python-pyudev-0.15-7.el7_2.1.noarch
python-gudev-147.2-7.el7.x86_64



How reproducible:


Steps to Reproduce:
1.install a kvm rhel7 vm in rhel7 host, the vm has a virtio interface
2.add another interface with rt8139 driver, you will see eth0, ens9 interface name.
3.reboot, you will see eth0 name change to eth1, ens9 remains unchanged.

Actual results:
interface name changed after reboot

Expected results:
interface name remain unchanged.

Additional info:
Comment 2 Lukáš Nykrýn 2016-09-09 14:56:14 UTC 
Well kernel names (ethN) are not persistent, there is nothing we can do about it. But I think that since 219-19 we also support persistent names for virtio device. Try to boot with net.ifnames=1 on the kernel command line.
All you can just pick some name a assign it to the device with specific hwaddress through ifcfg files. You just need to set DEVICE and HWADDR variables (but don't pick ethXX name).