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Bug 1173230

Summary:	RHEL 7 guest image does not persistently set console= kernel parameter
Product:	Red Hat Enterprise Linux 7	Reporter:	Lars Kellogg-Stedman <lars>
Component:	rhel-guest-image	Assignee:	Ryan Barry <rbarry>
Status:	CLOSED ERRATA	QA Contact:	Virtualization Bugs <virt-bugs>
Severity:	unspecified	Docs Contact:
Priority:	unspecified
Version:	7.1	CC:	dgregor, fdeutsch, jgreguske, jherrman, tlavigne, yuliu
Target Milestone:	rc
Target Release:	7.1
Hardware:	Unspecified
OS:	Unspecified
Whiteboard:	node
Fixed In Version:		Doc Type:	Bug Fix
Doc Text:	Previously, the Red Hat Enterprise Linux 7.1 KVM Guest Image did not set the default kernel arguments in the /etc/default/grub file persistently. As a consequence, updating the kernel caused the adjusted arguments to disappear, and the related boot entries thus did not include a serial console. With this update, Guest Image changes made to /etc/default/grub are persistent, and all default kernel arguments will be set on kernel updates.	Story Points:	---
Clone Of:		Environment:
Last Closed:	2015-03-06 17:54:29 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 Lars Kellogg-Stedman 2014-12-11 17:48:54 UTC

Description of problem:

The RHEL7 guest image sets console=ttyS0,115200n8 in /boot/grub2/grub.cfg but does *not* set this option persistently in /etc/default/grub.  This means that any action that causes grub.cfg to be regenerated (such as a kernel upgrade) will result in this option being lost.

In a remote cloud environment such as OpenStack or Amazon EC2, this can lead to the loss of crucial diagnostic information in the event of a problem.

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

20140930.0

How reproducible:

Always

Steps to Reproduce:
1. Boot the guest image
2. Upgrade the kernel
3. Examine /boot/grub2/grub.cfg

The correct way to set boot options is to modify the value of GRUB_CMDLINE_LINUX in /etc/default/grub, and then to run "grub2-mkconfig > /boot/grub2/grub.cfg".

Comment 3 yuliu 2015-01-27 05:39:08 UTC

Version: rhel-guest-image-7.1-20150116.0

# cat /etc/default/grub 
GRUB_TIMEOUT=1
GRUB_DEFAULT=saved
GRUB_DISABLE_SUBMENU=true
GRUB_TERMINAL_OUTPUT="console"
GRUB_CMDLINE_LINUX="crashkernel=auto console=tty0 no_timer_check net.ifnames=0 console=ttyS0,115200n8"
GRUB_DISABLE_RECOVERY="true"
[root@dhcp-8-156 ~]# cat /etc/default/grub |grep console
GRUB_TERMINAL_OUTPUT="console"
GRUB_CMDLINE_LINUX="crashkernel=auto console=tty0 no_timer_check net.ifnames=0 console=ttyS0,115200n8"

Verified as above.

Comment 5 errata-xmlrpc 2015-03-06 17:54:29 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