nagios-cvs: Too many open files?

[Ethan Galstad]

Gerd Mueller wrote:
>> I should have mentioned that all of my hosts and services are passiv. Maybe  "passive host bug" wasn't completly solved :).
> 
> Now I am sure it also happens on active services/hosts.
> 
> Much too much files:
> 
> nag179:/tmp# rm nagios*
> -bash: /bin/rm: Argument list too long
> 
> Gerd
> 

I think there are two problems here:

1.  Too many physical temp files.
2.  Too many open files that were deleted files, but still have kernel 
references

For #1, could you sort the files by modification time and see how they 
look.  If you've got a lot of "old" files (> 1 hour), there' a problem. 
  Some of these older files are normal, as I've mentioned before, and 
its best to run something like tmpwatch on the directory to remove them.

For #2...
lsof reports a number of temp files that are still open, but were 
deleted.  You can see if this is your problem by running:

lsof | grep nagios | grep DEL

I did some digging and this was caused by mmap() and munmap() when 
Nagios encountered a temp file of 0 byte size, which will happen when 
checks have no output.  I changed the code to skip mmap()ing altogether 
when it encounters 0 byte files, and that solved the problem for me.  A 
patch will be in CVS shortly for this...




Ethan Galstad,
Nagios Developer
---
Email: nagios at nagios.org
Website: http://www.nagios.org

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