Thanks all - I found the cause of the problem and fixed it. A patch
will be in CVS shortly.
Thomas Stolle wrote:
>
> From: SCHAER Frederic cea.fr>
> Subject: *nagios 3 host checks logic problem on some kernels/distros*
> *
> Newsgroups: *
> *MailScanner has
> detected a possible fraud attempt from "news.gmane.org" claiming to be*
> *gmane.network.nagios.devel*
> *
> Date: 2007-09-10 16:17:30 GMT (1 week, 15 hours and 23 minutes ago) *
>
> *Hi, *
>
> * *
>
> *I think I identified a problem (but not and the solution) on the nagios
> 3 source tree… *
>
> *I tried with both the 3.0b3 and cvs HEAD source files and could not get
> rid of the problem. *
>
> *I’m running a 2.4.21 kernel on a RHEL3 box. *
>
> * *
>
> *What happens is that as soon as I start nagios 3, it starts eating all
> of the *CPU*. *
>
[snip]
>
> *I have 53 hosts defined, I don’t understand why nagios is checking ever
> and ever the same host… and why this is not happening on all systems. *
>
> * *
>
> *De-activating host checks magically “solves” the problem. *
>
> * *
>
> *I just found out that commenting hosts “check_command” caused this
> behaviour (with host_checks_enabled=true), and that defining a correct
> check_command prevented nagios from being so *CPU* hungry… *
>
> * *
>
> *Hope I helped… *
>
> * *
>
> *Cheers *
>
>
>
> Dear List,
>
> I can confirm the problem Frederic reported.
> I am using Nagios 3.0b3 on CentOS 4.4
> After starting nagios, the process catches nearly 100 % CPU (See
> top-output below)
> Disableing hostchecks let the process return to normal values.
> As far as I can remember, the problem did not occour with nagios3.0a
> (but I can not verify at the moment)
>
> Tasks: 89 total, 3 running, 86 sleeping, 0 stopped, 0 zombie
> Cpu(s): 26.0% us, 1.3% sy, 0.0% ni, 72.6% id, 0.0% wa, 0.1% hi,
> 0.0% si
> Mem: 4041580k total, 1373844k used, 2667736k free, 60200k buffers
> Swap: 4192956k total, 0k used, 4192956k free, 1137348k cached
>
> PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND
> 28617 nagios 25 0 29756 10m 1056 R 96 0.3 17:12.48 nagios
> 1 root 16 0 4752 552 460 S 0 0.0 0:02.75 init
> 2 root RT 0 0 0 0 S 0 0.0 0:00.04 migration/0
>
>
> Thomas
>
>
> P *Please consider the environmental impact of needlessly printing this
> e-mail.*
>
Ethan Galstad,
Nagios Developer
---
Email: [email protected]
Website: http://www.nagios.org
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