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Bug 2090370

Summary: The resource-agent ocf:heartbeat:CTDB fails to start because of "Unable to set scheduler to SCHED_FIFO (Operation not permitted)"
Product: Red Hat Enterprise Linux 8 Reporter: Shane Bradley <sbradley>
Component: resource-agentsAssignee: Oyvind Albrigtsen <oalbrigt>
Status: CLOSED ERRATA QA Contact: cluster-qe <cluster-qe>
Severity: medium Docs Contact:
Priority: unspecified    
Version: ---CC: agk, cfeist, cluster-maint, fdinitto, kgaillot, kwenning, mjuricek, phagara, sbradley, toneata
Target Milestone: rcKeywords: Triaged, ZStream
Target Release: ---Flags: pm-rhel: mirror+
Hardware: Unspecified   
OS: Unspecified   
Whiteboard:
Fixed In Version: resource-agents-4.9.0-28.el8 Doc Type: If docs needed, set a value
Doc Text:
Story Points: ---
Clone Of:
: 2092262 2092263 (view as bug list) Environment:
Last Closed: 2022-11-08 09:09:06 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:
Bug Depends On:    
Bug Blocks: 2092262, 2092263    

Comment 10 Ken Gaillot 2022-07-27 20:38:36 UTC
Having the CTDB agent use cgexec when available sounds like the least intrusive approach. If the capability could be more broadly useful, it could be added to the resource-agents shell functions.

Comment 11 Klaus Wenninger 2022-08-01 08:51:58 UTC
(In reply to Ken Gaillot from comment #10)
> Having the CTDB agent use cgexec when available sounds like the least
> intrusive approach. If the capability could be more broadly useful, it could
> be added to the resource-agents shell functions.

Maybe there is a trick but simple 'cgexec -g cpu: ...' - the intuitive
way to execute something in the root-cgroup - is failing for me.
If that really doesn't work using cgexec we would be again back to the
situation that we need to setup some cgroup that has a proper realtime-share
assigned. Setting up a realtime-slice with systemd should do the purpose.
So we don't have to make a resource run as systemd-unit but instead we
can simply use 'cgexec -g- cpu:realtime.slice ...'.

Comment 12 Oyvind Albrigtsen 2022-08-01 09:28:34 UTC
I'm working on a patch using cgexec.

Comment 13 Oyvind Albrigtsen 2022-08-04 08:30:52 UTC
New patch to move the process to the root cgroup if rt scheduling is enabled (makes the previous patch obsolete):
https://github.com/ClusterLabs/resource-agents/pull/1796

Comment 20 errata-xmlrpc 2022-11-08 09:09:06 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 (resource-agents bug fix and enhancement update), 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://access.redhat.com/errata/RHBA-2022:7443