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Bug 1167852

Summary:	Predictable Network Interface Names should be disabled in rhel-guest-image when using SR-IOV
Product:	Red Hat Enterprise Linux 7	Reporter:	Itzik Brown <itbrown>
Component:	rhel-guest-image	Assignee:	Ryan Barry <rbarry>
Status:	CLOSED ERRATA	QA Contact:	Virtualization Bugs <virt-bugs>
Severity:	unspecified	Docs Contact:
Priority:	unspecified
Version:	7.0	CC:	dgregor, jgreguske, jherrman, lars, leiwang, wshi, yuliu
Target Milestone:	rc
Target Release:	7.1
Hardware:	Unspecified
OS:	Linux
Whiteboard:	node
Fixed In Version:		Doc Type:	Bug Fix
Doc Text:	Prior to this update, starting a guest image in an environment that was using Simple Root I/O Virtualization (SR-IOV) caused device names assigned to the guest's network interfaces to be different from the names in the default configuration file. As a consequence, the guest image could not acquire an IP address. This update disables the use of predictive interface naming when rhel-guest-image is used with SR-IOV, which prevents the problem from occurring.	Story Points:	---
Clone Of:		Environment:
Last Closed:	2015-03-06 17:54:26 UTC	Type:	Bug
Regression:	---	Mount Type:	---
Documentation:	---	CRM:
Verified Versions:		Category:	---
oVirt Team:	---	RHEL 7.3 requirements from Atomic Host:
Cloudforms Team:	---	Target Upstream Version:
Embargoed:

Description Itzik Brown 2014-11-25 14:14:08 UTC

Description of problem:
When booting an instance with SR-IOV interface using rhel-guest-image the interface name doesn't match with the configuration file which causes the Instance to start without IP address.

For example the interface name is ens4 while the interface in the configuration file is eth0

When passing net.ifnames=0 on the kernel command line the interface name is eth0 and the problem is solved.

Version-Release number of selected component (if applicable):
rhel-guest-image-7.0-20140909.0
OSP6 
How reproducible:
100%

Steps to Reproduce:
1. Start an instance with a Virtual Function attached
2. Use 'ip a' to list the interfaces' names
3.

Actual results:
Interface name is different from eth0

Expected results:
Interface name should be 'eth0'

Additional info:

Comment 2 Ryan Barry 2014-12-12 21:28:06 UTC

*** Bug 1173237 has been marked as a duplicate of this bug. ***

Comment 3 yuliu 2015-01-08 09:19:08 UTC

Version: rhel-guest-image-7.0-20140930.0.x86_64.qcow2

When boot with SR-IOV interface attached, the DEVICE names are something like: ensx. After boot with net.ifnames=0 as above, problem solved.

Comment 5 yuliu 2015-01-19 05:59:45 UTC

Version: rhel-guest-image-7.1-20150116.0.x86_64.qcow2

Check network after booted with SR-IOV interface attached, the DEVICE names are eth0 type.

#cat /etc/grub2.cfg |grep net

...net.ifnames=0 

It has net.ifnames=0 appended to kernel command line.

Verified as above.

Comment 7 errata-xmlrpc 2015-03-06 17:54:26 UTC

Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.

For information on the advisory, and where to find the updated
files, follow the link below.

If the solution does not work for you, open a new bug report.

https://rhn.redhat.com/errata/RHBA-2015-0648.html