Bug 45414
| Summary: | nagios CRITICAL: Unknown program "<PROG>": bound to nscd socket. | ||
|---|---|---|---|
| Product: | UCS | Reporter: | Stefan Gohmann <gohmann> |
| Component: | Monitoring (Prometheus or Nagios) | Assignee: | Jürn Brodersen <brodersen> |
| Status: | CLOSED FIXED | QA Contact: | Felix Botner <botner> |
| Severity: | normal | ||
| Priority: | P5 | CC: | botner, brodersen |
| Version: | UCS 4.2 | ||
| Target Milestone: | UCS 4.2-2-errata | ||
| Hardware: | Other | ||
| OS: | Linux | ||
| See Also: |
https://forge.univention.org/bugzilla/show_bug.cgi?id=42812 https://forge.univention.org/bugzilla/show_bug.cgi?id=49967 |
||
| What kind of report is it?: | Bug Report | What type of bug is this?: | 5: Major Usability: Impairs usability in key scenarios |
| Who will be affected by this bug?: | 2: Will only affect a few installed domains | How will those affected feel about the bug?: | 2: A Pain – users won’t like this once they notice it |
| User Pain: | 0.114 | Enterprise Customer affected?: | Yes |
| School Customer affected?: | ISV affected?: | ||
| Waiting Support: | Flags outvoted (downgraded) after PO Review: | ||
| Ticket number: | 2017091521000662 | Bug group (optional): | Workaround is available |
| Max CVSS v3 score: | |||
|
Description
Stefan Gohmann
The message has been introduced with Bug #42812. I think we should fix it soon since it is a regression. Workaround: restart nscd or remove UNIVENTION_NSCD2 from the list of nagios services for the server object in UMC and add UNIVENTION_NSCD. Commit: e837a1350ba6a05bf23308b3af2dc6d71c0d2a28
Package: univention-nagios
Version: 10.1.1-2A~4.2.0.201709211123
Branch: ucs_4.2-0
Scope: errata4.2-2
I used lsof to check which program opened the nscd socket. lsof sometimes returns the wrong result.
The problem occurs if a program deletes the file which was created during the socket generation but does not close the socket. That case is handled wrong by lsof and sometimes these programs are reported on the wrong sockets.
Small script to illustrate the problem:
'''
#!/bin/bash
for i in $(seq 1 1024); do
( nc -l -U "$PWD/test_soc"$i & )
done
sleep 1
for i in $(seq 1 1024); do
rm "test_soc$i"
done
sleep 1
( nc -l -U "$PWD/test_soc" & )
echo lsof
lsof "test_soc"
echo "fuser"
fuser "test_soc"
pkill -f "nc -l -U $PWD/test_soc"
rm "$PWD/test_soc
'''
I fixed it by replacing lsof with fuser.
OK - nscd check OK - YAML |