How to monitor a linux file opened & closed status using Nagios

[Marc Powell]

On Oct 1, 2009, at 6:48 AM, Selvakumar A wrote:

> Hi,
>   Thanks for your guidance.I followed your instructions.I installed  
> net_nc in windows-XP and  I could only get the file's modified time.
>   I am also interested to know about how to monitor a linux file's  
> status whether it is opened or closed and modified etc.I used  
> chech_file_age plugin which gives only the age of the file.Is there  
> any way please help me.

I'm not aware of any plugins that check these. If you decide to write  
your own plugin, lsof (when run using sudo) will be your friend.
	
	'is opened' - specified file appears in the output of lsof
	'is closed' - specified file does not appear in the output of lsof
	'is modified' - depends on what you mean by modified. File age may be  
sufficient but if you want to see if actual changes were made you'll  
need to create a copy at each run and compare the current with the  
previous (using cmp or diff, for example).

A quick google for 'nagios check lsof' doesn't yield any interesting  
initial results but you might have luck further in the search results.

--
Marc


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