[Fwd: distributed monitoring host checking question]

[Sean McAfee]

Tom Ammon wrote:
> So, no thoughts on this question?
>
> -------- Original Message --------
> Subject: 	distributed monitoring host checking question
> Date: 	Wed, 30 Jul 2008 01:05:21 -0600
> From: 	Tom Ammon <tom.ammon at utah.edu>
> To: 	nagios-users at lists.sourceforge.net
>
>
>
> Hi,
>
> I am working on setting up a distributed monitoring system with Nagios 
> (actually Groundwork). I have 3 child servers and 1 parent server, using 
> NSCA to send passive check results from the children to the parent server.
>
> My question is about how Nagios (version 2.5) will behave when an on 
> demand host check needs to be run.
>
> So for example:
>
> Host A is configured with check_host_alive ( a simple ping ) as its host 
> check command on the parent server. It is also configured with Service 
> A, say an SNMP check. Active host checks are not disabled on the parent 
> server, but active service checks are.
>
> Host A, obviously, is also configured on the child server. When the 
> child server sends a passive check result up to the parent saying that 
> the SNMP check has failed, will the parent server then run the on-demand 
> host check command to verify that Host A is still up? If not, how do I 
> get that information up to the parent? Are passive host checks my only 
> option?
>
> So I guess the question is this: In a distributed monitoring setup, will 
> a parent server run an on-demand host check for a host that gets a 
> report (via a passive service check sent from a child server) of a 
> service being critical?
>
> Thanks,
>
> Tom

In an all Nagios 3 (I don't believe anything has changed in the relevant 
check logic from 2.x) setup with a master configured with 
execute_service_checks=1, execute_host_checks=0, the master does indeed 
run the follow-up host check after receiving a passive service result:

[1217521713.140143] [016.1] [pid=16669] Handling check result for 
service 'NTP Time Server Ping' on host 'time.example.com'...
[1217521713.140183] [016.0] [pid=16669] ** Handling check result for 
service 'NTP Time Server Ping' on host 'time.example.com'...
[1217521713.140243] [016.1] [pid=16669] HOST: time.example.com, SERVICE: 
NTP Time Server Ping, CHECK TYPE: Passive, OPTIONS: 0, SCHEDULED: No, 
RESCHEDULE: No, EXITED OK: Yes, RETURN CODE: 2, OUTPUT: Testing
[1217521713.140538] [016.0] [pid=16669] ** Running async check of host 
'time.example.com'...
[1217521713.140565] [001.0] [pid=16669] check_time_against_period()
[1217521713.140608] [016.0] [pid=16669] Checking host 'time.example.com'...
[1217521713.140649] [016.2] [pid=16669] Adjusting check attempt number 
for host 'time.example.com': current attempt=1/3, state=0, state type=1
[1217521713.141121] [2048.2] [pid=16669]   Uncleaned macro.  Running 
output (87): '/usr/local/libexec/nagios/check_ping -H time.example.com'
[1217521713.141135] [2048.2] [pid=16669]   Just finished macro.  Running 
output (87): '/usr/local/libexec/nagios/check_ping -H time.example.com'
[1217521713.141162] [2048.2] [pid=16669]   Not currently in macro.  
Running output (126): '/usr/local/libexec/nagios/check_ping -H 
time.example.com -t 5 -w 3000.0,80% -c 5000.0,100% -p 5'
[1217521713.141179] [2048.1] [pid=16669]   Done.  Final output: 
'/usr/local/libexec/nagios/check_ping -H time.example.com -t 5 -w 
3000.0,80% -c 5000.0,100% -p 5'

Sean McAfee
System Engineer

Collaborative Fusion, Inc.
 smcafee at collaborativefusion.com
 412-422-3463 x 4025

5849 Forbes Avenue
Pittsburgh, PA 15217

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