Nagios restart mucks with service check schedu le

[Tedman Eng]

You should add some headroom also.  This is awlays a good practice, since
downed host checks will occupy their own chunk of time.

-----Original Message-----
From: Robert Nelson [mailto:rnelson at windchannel.com]
Sent: Monday, November 01, 2004 2:49 PM
To: Tedman Eng; nagios-users at lists.sourceforge.net
Subject: RE: [Nagios-users] Nagios restart mucks with service check
schedule


Ted,

Well, that's a good fix I guess, except for the part where I will have
to adjust that every time we add new services. Ugh. That really sucks :/

Rob Nelson
Network Engineer
Windchannel Communications
919-538-6326 

> -----Original Message-----
> From: Tedman Eng [mailto:teng at dataway.com] 
> Sent: Monday, November 01, 2004 4:53 PM
> To: nagios-users at lists.sourceforge.net
> Cc: Robert Nelson
> Subject: RE: [Nagios-users] Nagios restart mucks with service 
> check schedule
> 
> 
> Recalculate your nagios.cfg file setting for service 
> inter-check-delay.
> Don't use the 's'mart setting in this case.  To accomodate 
> the heavy 1st
> minute, you may need to adjust other related values such as 
> max_concurrent,
> etc.
> 
> Your new formula:
> Take 1 minute divide by # services, use result as your 
> inter-check-delay.
> 
> Refer to docs for more information about service check 
> scheduling theory.
> http://nagios.sourceforge.net/docs/1_0/checkscheduling.html#in
> ter_check_dela
> y
> 
> Example:
> 10 services
> inter_check_delay = 6 sec
> (all checks will complete within first minute.  After that, 
> each uses its
> defined interval in  rescheduling)
> 
> 
> Caveats:
> While your startup is now finishing in time, your service 
> checks will be
> "clumped", so this may have adverse affects on resources such 
> as monitored
> devices, network load, etc.  The "clump" will  slowly become 
> spread out in
> random fashion over time until the next restart.
> 
> 
> 
> -----Original Message-----
> From: Robert Nelson [mailto:rnelson at windchannel.com]
> Sent: Monday, November 01, 2004 11:19 AM
> To: nagios-users at lists.sourceforge.net
> Subject: [Nagios-users] Nagios restart mucks with service 
> check schedule
> 
> 
> Hey,
> 
> I'm using Nagios v1.2 and running into a bit of a problem with
> scheduling. My template specifies 5 minutes for normal checks, and in
> select definitions I've been setting it to 1 minute. Doesn't 
> seem to be
> taking that into account on a reload/reschedule, however.
> 
> I've got the following services template in use:
> 
> # Standard service definition, with standard check options
> define service{
> 	name				standard-service
> 	active_checks_enabled		1
> 	passive_checks_enabled		1
> 	parallelize_check		1
> 	obsess_over_service		1
> 	check_freshness			0
> 	notifications_enabled		1
> 	event_handler_enabled		1
> 	flap_detection_enabled		1
> 	process_perf_data		0
> 	retain_status_information	1
> 	retain_nonstatus_information	1
> 	is_volatile		0
> 	check_period		24x7
> 	max_check_attempts	3
> 	normal_check_interval	5
> 	retry_check_interval	3
> 	notification_interval	480
> 	notification_period	24x7
> 	notification_options	w,u,c,r
> 	register			0	}
> 
> I then have the following service:
> 
> define service{
> 	use			standard-service
> 	host_name		westst_cr1.windchannel.com
> 	service_description	Serial3/0
> 	contact_groups		router-admins
> 	check_command		check_iftraffic!Serial3/0
> 	process_perf_data	1
> 	normal_check_interval	1
> 	}
> 
> 
> 
> 
> After restarting nagios (service nagios reload), Nagios reschedules
> service checks. For someone reason, this check (and others 
> like it) get
> scheduled for up to 5 minutes later, depending on where they 
> fall in the
> semi-random scheduling. After that first check is processed, the next
> check is scheduled for 1 minute later. Normally I wouldn't worry about
> it, but I'm processing performance data on this service too.
> 
> Is there any known issue with service check scheduling I 
> should be aware
> of, or a way around it?
> 
> Rob Nelson
> Network Engineer
> Windchannel Communications
> 919-538-6326 
> 
> 
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