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Bug 2137299

Summary: RFE: User-configured modification of system boot-related files
Product: Red Hat Enterprise Linux 9 Reporter: Jiří Mencák <jmencak>
Component: tunedAssignee: Jaroslav Škarvada <jskarvad>
Status: CLOSED MIGRATED QA Contact: Robin Hack <rhack>
Severity: high Docs Contact:
Priority: high    
Version: 9.2CC: jeder, jskarvad
Target Milestone: rcKeywords: FutureFeature, MigratedToJIRA
Target Release: ---Flags: pm-rhel: mirror+
Hardware: Unspecified   
OS: Unspecified   
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Doc Text:
Story Points: ---
Clone Of: Environment:
Last Closed: 2023-09-21 21:07:29 UTC Type: Story
Regression: --- Mount Type: ---
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Verified Versions: Category: ---
oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
Cloudforms Team: --- Target Upstream Version:
Embargoed:

Description Jiří Mencák 2022-10-24 11:35:37 UTC
Description of problem:
The [bootloader] plug-in supports modifying/managing boot-related system files all over the filesystem, be it /etc/default/grub, /etc/grub2.cfg, /etc/grub2-efi.cfg, /etc/grub.d/, /etc/default/grub or BLS's /boot/loader/entries/* . While this is absolutely essential to do on RHEL systems, on "reprovisionable, anti-hysteresis" (see https://blog.verbum.org/2020/08/22/immutable-%e2%86%92-reprovisionable-anti-hysteresis/) systems this is an unwanted behaviour.  However, it is still very useful/essential to calculate kernel boot parameters and populate /etc/tuned/bootcmdline file.

Provide a way of turning off modifying boot-related system files, while calculating and populating /etc/tuned/bootcmdline file.  Also, no errors/warnings should be issues when boot-related system files or tools (grub2-editenv, rpm-ostree, ...) exist.

It would be useful to have this (boolean) toggle in tuned-main.conf, for example:
bootcmdline_calculate_only=false  # disabled by default not to break old behaviour

Comment 2 Jaroslav Škarvada 2023-01-16 14:25:14 UTC
Jiri do you need /etc/tuned/bootcmdline for anything? Because if not I would propose more flexible approach allowing global disablement of the plugins through the tuned-main.conf, e.g.:
plugins_disabled = bootloader

This would globally disable any usage of the bootloader plugin in the TuneD profiles with INFO message that the plugin is disabled.

Moreover this approach would allow global disabling of any combination of plugins, e.g.
plugins_disabled = bootloader, scheduler

Comment 3 Jiří Mencák 2023-01-16 14:46:12 UTC
Thank you for lookingn into this, Jardo!

(In reply to Jaroslav Škarvada from comment #2)
> Jiri do you need /etc/tuned/bootcmdline for anything? Because if not I would
> propose more flexible approach allowing global disablement of the plugins
> through the tuned-main.conf, e.g.:
> plugins_disabled = bootloader

Yes, we do need and use /etc/tuned/bootcmdline file in RHOCP.  What we do
at the moment is run TuneD in a container which discards all the modifications TuneD does
to the host filesystem (there are some exceptions though).  However, we do use
/etc/tuned/bootcmdline file to to gather the calculated kernel parameters.  That
information is then fed as configuration to another RHOCP operator (MCO) which
then adjusts the kernel parameters and reboots the host machine.

The reasoning behind this request is that the plan is to run TuneD outside of the 
container directly on the host and we need to disable any conflicting changes on the host
filesystem TuneD does while keeping the useful stuff such as calculating the kernel
boot parameters in its own directory (/etc/tuned).

Comment 5 RHEL Program Management 2023-09-21 20:51:35 UTC
Issue migration from Bugzilla to Jira is in process at this time. This will be the last message in Jira copied from the Bugzilla bug.

Comment 6 RHEL Program Management 2023-09-21 21:07:29 UTC
This BZ has been automatically migrated to the issues.redhat.com Red Hat Issue Tracker. All future work related to this report will be managed there.

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