Using Nagios to monitor "service-less" hosts

[Andy Shellam (Mailing Lists)]

Hi Ted,

I understand the distinction - I *did* have host checks actively 
scheduled (ie. the host parameter 'check_interval' set to 1 - this is 
now 0 so host checks shouldn't be scheduled, right?)  Yet Nagios IS 
checking the hosts every few minutes roughly, regardless of child 
service status.

Here's a dead simple example - the FH-Gateway - it has a single service, 
which is a Ping.  The host also has a Ping set as it's 
active_check_command parameter.
Now, if I show you the service breakdown for the Ping _service_ on 
FH-Gateway:

Current Status: 	
  OK    
Status Information: 	PING OK - Packet loss = 0%, RTA = 3.02 ms
Performance Data: 	
Current Attempt: 	1/2
State Type: 	HARD
Last Check Type: 	ACTIVE
Last Check Time: 	08-11-2006 20:49:37
Status Data Age: 	0d 0h 0m 51s
Next Scheduled Active Check:   	08-11-2006 20:50:37
Latency: 	0.607 seconds
Check Duration: 	9.013 seconds
Last State Change: 	08-11-2006 10:46:46
Current State Duration: 	0d 10h 3m 42s


Nagios reports it's been in the same state (ie. OK) for 10 hours, 3 
minutes, and 42 seconds right?
So why was the host checked only a few seconds ago?

Host Status: 	
  UP    
Status Information: 	PING OK - Packet loss = 0%, RTA = 0.27 ms
Performance Data: 	
Current Attempt: 	1/2
State Type: 	HARD
Last Check Type: 	ACTIVE
Last Check Time: 	08-11-2006 20:50:49
Status Data Age: 	0d 0h 0m 39s
Next Scheduled Active Check:   	N/A
Latency: 	9.113 seconds
Check Duration: 	9.011 seconds
Last State Change: 	07-11-2006 06:20:35
Current State Duration: 	1d 14h 30m 53s
Last Host Notification: 	N/A
Current Notification Number:   	0  
Is This Host Flapping? 	
  NO  
Percent State Change: 	0.00%
In Scheduled Downtime? 	
  NO  
Last Update: 	08-11-2006 20:51:16


If the general line of thinking is correct, Nagios should have last 
checked the host back at (or around) 10:46 this morning when there was a 
blip in the service check.  But it didn't.  It does check them every 1-2 
minutes.
My check_interval parameter is 0 - the config viewer in the web CGIs 
shows "enabled active checks" as NO for each host.

Since I've been writing this - the above host has been checked again at 
20:54:49 - exactly 4 minutes since the last check.  No change in the 
service status - 10 hours, 9 minutes now.

Any ideas?

Andy.



Tedman Eng wrote:
> Host checks are not actively scheduled in normal operation.
>
> You could go months without requiring a host check, and the status age of
> the host check will show something like 81 days for example.
>
> If you see recent host checks, then that means there was a service problem
> and Nagios wanted to be sure it wasn't the host.
>
> Perhaps if you thought of "host check" as "network link status", it would
> make the distinction more clear.
>
>
>   
>> -----Original Message-----
>> From: Andy Shellam (Mailing Lists)
>> [mailto:andy.shellam-lists at mailnetwork.co.uk]
>> Sent: Wednesday, November 08, 2006 11:56 AM
>> To: Sloane, Robert Raymond
>> Cc: nagios-users at lists.sourceforge.net
>> Subject: Re: [Nagios-users] Using Nagios to monitor 
>> "service-less" hosts
>>
>>
>> Sloane, Robert Raymond wrote:
>>     
>>>> Last Check Time: 	08-11-2006 19:34:40
>>>> Next Scheduled Active Check:   	N/A
>>>>     
>>>>         
>>> Interesting.  Nagios thinks the last check was run over a month ago.
>>>
>>>   
>>>       
>> No, thankfully!  That date is the 8th November (British format.)
>>     
>>> You wouldn't see anything about hosts in the scheduling queue.  Host
>>> checks are run immediately, not through the queue.  That is 
>>>       
>> why it is
>>     
>>> best to not use them.
>>>   
>>>       
>> I did when the check_interval was set to 1 in the hosts - it 
>> showed the 
>> host name and a blank service column.
>> I'd mentioned this only to prove the point that the checks do 
>> not seem 
>> to be scheduled any more, so I cannot figure out why it's 
>> still running 
>> the host checks at (seemingly) regular intervals.
>>
>> There are no hosts under that machine (or indeed above it), and all 
>> services checks are up and have been for a good 6-8 hours.
>>
>> I'm stumped!
>>
>> Andy.
>>
>> --------------------------------------------------------------
>> -----------
>> Using Tomcat but need to do more? Need to support web 
>> services, security?
>> Get stuff done quickly with pre-integrated technology to make 
>> your job easier
>> Download IBM WebSphere Application Server v.1.0.1 based on 
>> Apache Geronimo
>> http://sel.as-us.falkag.net/sel?cmd=lnk&kid=120709&bid=263057&
>>     
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-------------------------------------------------------------------------
Using Tomcat but need to do more? Need to support web services, security?
Get stuff done quickly with pre-integrated technology to make your job easier
Download IBM WebSphere Application Server v.1.0.1 based on Apache Geronimo
http://sel.as-us.falkag.net/sel?cmd=lnk&kid=120709&bid=263057&dat=121642
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