tracing nagios actions

Ray Kiddy ray at ganymede.org
Mon Dec 20 20:47:43 CET 2010
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On Dec 20, 2010, at 10:48 AM, mark bradley wrote:

> There's always strace(1) if you want to dive into the details ...
> 
> Mark

Ah. Unfortunately, I am not Mac OS X and not Linux.

On Dec 20, 2010, at 10:28 AM, Mike Chesnut wrote:

>> Of course, one cannot tell what command is _actually_ being executed or
>> which command _was_ actually executed. I pointed this out in a previous
>> post (below). Apparently there are no workarounds for this.
> 
> If I understand what you're asking about, I've used this to achieve it 
> in the past:
> 
> http://www.waggy.at/nagios/capture_plugin.htm

This is interesting. It is unfortunate that one would have to put the plugin onto every command, but it is definitely a possibility. Of course, nagios could itself have this kind of functionality. But that would be up to the implementors.

Thanks for the replies, though.

cheers - ray

> 
> On Mon, Dec 20, 2010 at 1:18 PM, Ray Kiddy <ray at ganymede.org> wrote:
> 
> On Dec 20, 2010, at 9:36 AM, Polifemo, Salvatore wrote:
> 
>> Yes, run the actual command from the command line as Steve demonstrated.
>>  
>> Make sure which command is being used, and if you run the command with no parameters it will display the correct usage.
>>  
>> Salvatore Polifemo
>> Sr. Systems Security Specialist
>> ConEdison Solutions
>> 100 Summit Lake Drive
>> Valhalla, NY 10595
>>  
> 
> Of course, one cannot tell what command is _actually_ being executed or which command _was_ actually executed. I pointed this out in a previous post (below). Apparently there are no workarounds for this.
> 
> - ray
> 
> Begin forwarded message:
> 
>> From: Ray Kiddy <ray at ganymede.org>
>> Date: November 17, 2010 9:42:59 AM PST
>> To: Nagios Users List <nagios-users at lists.sourceforge.net>
>> Subject: [Nagios-users] can log show actual command executed?
>> Reply-To: Nagios Users List <nagios-users at lists.sourceforge.net>
>> 
>> 
>> I am having a problem figuring out see what is actually being executed from a service. Is there a way to get the nagios log to contain the actual command being executed?
>> 
>> This is what I am seeing in the Nagios.log file:
>> 
>> 	[1290013792] SERVICE ALERT: myhost.com;Special App;CRITICAL;SOFT;1;(Service Check Timed Out)
>> 
>> This is what I see in the nagios.dat file:
>> 
>> 	check_command=check_http!/myURL!alive
>> 
>> So, this shows me what the command string is in the service.cfg. I cannot see, though, what the actual command line is at this moment in time. It turns out that this check_command corresponds (I think) to:
>> 
>> 	check_http -u /myURL -s alive
>> 
>> How would I know this, though, if the command definition had been changed or if it is using, because of a mis-spelling, a command I do not think it is using? If I go into the command.cfg and switch the order of parameters, for example, I see nothing in these logs that tells me what is doing what.
>> 
>> I know the simplest answer is "You should not do that." But my point is that the log file does not have enough information to tell me what happened at a past moment of time. I would need the log information _and_ the state of the command definitions at that time. If a log does not show you what happened in the past, what is its purpose?
>> 
>> I am having a problem with a particular web application. For some reason I put in the check and it fails. I execute the check_http that I _think_ this service is doing, and it gives me an OK. I ended up creating a custom executable that calls curl and fetches against the same URL and this now works fine. Kind of lame, though. I use check_http in about 100 other services. So, why is this one single service not working? An obvious answer is that I am not calling the command in the way I think I am. But if I look in the log to see what the service did, I can see what I _think_ it did based on what I can see in what I _think_ is the correct command definition. But I really do not know. I do not see a line like "check_http -u /myURL -s alive" in the log, so, I cannot see if I am mis-reading things.
>> 
>> Any suggestions?
>> 
>> - ray
>> 
> 
> 
> 
>> From: steve f [mailto:a31modela at hotmail.com] 
>> Sent: Monday, December 20, 2010 12:14 PM
>> To: nagios-users at lists.sourceforge.net
>> Subject: Re: [Nagios-users] tracing nagios actions
>>  
>> Mark,
>> 
>> I think Salvatore means run the check manually from the command line , make sure you run it as the nagios user and try setting tha warning & critical values to something that will make it fail also:
>> 
>> /usr/local/nagios/libexec > ./check_disk -w 50 -c 70 -p /home
>> DISK OK - free space: /home 440 MB (95% inode=99%);| /home=20MB;436;416;0;486
>> 
>> The -p just checks a specific path.  ( FYI )
>> 
>> Steve
>> 
>> 
>> 
>> 
>> Date: Mon, 20 Dec 2010 11:50:14 -0500
>> From: gopearls42 at gmail.com
>> To: nagios-users at lists.sourceforge.net
>> Subject: Re: [Nagios-users] tracing nagios actions
>> 
>> Hi Salvatore,
>>  
>> They're all Unix (Redhat) servers. By check command do you mean nagios -v? I've done that and I do not get an errors.
>>  
>> Thanks,
>> Mark
>>  
>> On Mon, Dec 20, 2010 at 11:35 AM, Polifemo, Salvatore <polifemos at conedsolutions.com> wrote:
>> Are these Windows or *nix server?
>>  
>> Either wau run the check command manually from a console and see what the results are.
>>  
>>  
>>  
>> Salvatore Polifemo
>> Sr. Systems Security Specialist
>> ConEdison Solutions
>> 100 Summit Lake Drive
>> Valhalla, NY 10595
>>  
>> From: mark bradley [mailto:gopearls42 at gmail.com] 
>> Sent: Monday, December 20, 2010 11:14 AM
>> To: nagios-users at lists.sourceforge.net
>> Subject: [Nagios-users] tracing nagios actions
>>  
>> Hi,
>>  
>> I have a small-ish number of servers and I've tried to configure Nagios to warn me about disk-space running low. The problem is that, although disk space is above both warning and critical levels I'm not getting any notifications.
>>  
>> The nagios.log file is silent on the topic and nagios -v does not produce any errors or warnings.
>>  
>> Is there a way to trace what actions nagios is considering (much like make -n) in order to debug this problem? Is there a debugging methodology defined somewhere? If it's in your head can you share?
>>  
>> Thanks,
>> Mark
>> 
> 
> 
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