Re: [Nagios-users] "notification_interval" from the "serviceescalation" is ignored?

From: Richard Mohr <rfmohr(at)osc.edu>
Date: Thu Aug 30 2007 - 14:43:30 EDT

On Thu, 2007-08-30 at 14:12 +0200, Ilya Ruprecht wrote:

> Furthermore, the "notification_interval" in the service-part is described as "Re-notify about service problems every XXX".
> Note: "about service problems".
> Now, if i set the notification_interval to a lower value then a "normal_check_interval", i.e. "9", i get following warning-message
> at nagios pre-flight-check:

[snip]

> But, hell, what the "normal_check_interval" have to do with "notification_interval"?! > These two are completely different things! Or have i misunderstood something?

Perhaps this will help clear things up. The "notification_interval" option sets an upper limit on how often notifications are sent. The "normal_check_interval" options controls how often the check is run.

If notification_interval=10 and normal_check_interval=5, you can get a situation like this one (I'll use t=XX to try and convey the timeline when events occur).

[t=0] Check runs.
[t=0] Check fails.
[t=0] Nagios sends notification.
[t=5] Check runs
[t=5] Check fails
[t=5] Time since last notifications is 5 which is less than
notification_interval=10. Nagios prevents notification.
[t=10] Check runs.
[t=10] Check fails.
[t=10] Time since last notification is 10 which is greater than or equal
to notification_interval=10. Nagios sends notification.

However if notification_interval=5 and normal_check_interval=10, you get this.

[t=0] Check runs.
[t=0] Check fails.
[t=0] Nagios sends notification.
[t=10] Check runs.
[t=10] Check fails.
[t=10] Time since last notification is 10 which is greater than or equal
to notification_interval=10. Nagios sends notification.

Nagios only sends notifications immediately after a check (it won't resend an old value). So if normal_check_interval >= notification_interval, you effectively have notification_interval = normal_check_interval. That is why Nagios prints the warning message:

"Warning: Service 'SSH' on host 'vpn-gw1-local' has a notification interval less than its check interval! Notifications are only re-sent after checks are made, so the effective notification interval will be that of the check interval."

That seems to be what is happening in your case.

-- 
Rick Mohr
Systems Developer
Ohio Supercomputer Center


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Received on Thu Aug 30 14:43:39 2007