Bug 47319 – UNIVENTION_RAID returns "UNKNOWN: dm:[No devices to check];......"

Bug 47319 - UNIVENTION_RAID returns "UNKNOWN: dm:[No devices to check];......"


Summary:	UNIVENTION_RAID returns "UNKNOWN: dm:[No devices to check];......"

Status:	CLOSED FIXED

Product:	UCS
Classification:	Unclassified
Component:	Monitoring (Prometheus or Nagios)
Version:	UCS 4.3
Hardware:	Other Linux

Importance:	P5 normal (vote)
Target Milestone:	UCS 4.3-2-errata
Assigned To:	Felix Botner
QA Contact:	Erik Damrose

URL:
Keywords:

Depends on:
Blocks:
	Show dependency tree / graph

Reported:	2018-07-09 12:40 CEST by Sönke Schwardt-Krummrich
Modified:	2022-06-27 17:48 CEST (History)
CC List:	3 users (show)

See Also:
What kind of report is it?:	Bug Report
What type of bug is this?:	4: Minor Usability: Impairs usability in secondary scenarios
Who will be affected by this bug?:	3: Will affect average number of installed domains
How will those affected feel about the bug?:	2: A Pain – users won’t like this once they notice it
User Pain:	0.137
Enterprise Customer affected?:
School Customer affected?:	Yes
ISV affected?:
Waiting Support:	Yes
Flags outvoted (downgraded) after PO Review:
Ticket number:	2018070621000654
Bug group (optional):
Max CVSS v3 score:

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Description Sönke Schwardt-Krummrich

2018-07-09 12:40:41 CEST

The handling of device mapper RAID is broken in check_raid as of UCS 4.3.
The check always returns "UNKNOWN" state if no dm raid is configured (even if a mdraid is configured):
UNKNOWN: dm:[No devices to check]; mdstat:[md3(2.73 TiB raid5):UUUU, md2(1023.44 MiB raid1):UUUU]

So the check is currently nearly useless.

See also:
https://github.com/glensc/nagios-plugin-check_raid/pull/172
https://github.com/glensc/nagios-plugin-check_raid/issues/142

Temporary workaround (one line!):
sed -i -re 's,/usr/lib/nagios/plugins/check_raid$,/usr/lib/nagios/plugins/check_raid -p mdstat,' /etc/nagios/nrpe.univention.d/UNIVENTION_RAID.cfg

Then restart the NRPE daemon: "service nagios-nrpe-server restart"

We should consider to ship univention-nagios-raid with "-p mdstat" als default arguments for check_raid.

Comment 1 Christina Scheinig

2018-09-17 10:19:16 CEST

The customer would like the fix within the next 2 weeks. Is that realistic?

Comment 2 Felix Botner

2018-09-19 11:36:47 CEST

univention-nagios-raid: e369348b2bcb33b7fe00b3880a8c51115fff30b7
yaml: 4bf5f2ec9d5aa5c179636954095be27ccba7ce28

We now always use "check_raid -p mdstat" (and no longer the dm plugin, if that is a problem, we have to make it configurable in the future).

For updates, we simply fix the /etc/nagios/nrpe.univention.d/UNIVENTION_RAID.cfg (which is generated by a listener handler) and restart the nrpe server.

New installations should use the modified command in "etc/nagios-plugins/config/univention-raid.cfg" directly.

See nagios/univention-nagios-raid/test.txt for information about how to setup a raid.

Comment 3 Erik Damrose

2018-09-24 16:45:40 CEST

OK: adapted check works for working, broken, rebuilding raid
OK: Config is fixed during update
OK: yaml
Verified

Comment 4 Erik Damrose

2018-09-26 13:24:41 CEST

<http://errata.software-univention.de/ucs/4.3/243.html>