Nagios Support Forum

After hours, we have servers that are rebooting due to updates and they often can take several minutes to come back up. This frequently results in a Host Down and then a Host Up notification. Is there a way in Nagios 3 to have an after hours setup that either delays the notifications or adjusts the parameters that determine whether a host is down in order to avoid getting these false positives?

Take a look at scheduled downtime: http://nagios.sourceforge.net/docs/3_0/downtime.html

You can do Fixed if you know what time the host goes down, or Flexible if you know it will happen but not when.

You can do this through timeperiods as well. Create a new timeperiod that excludes (or does not include) the after hours that your servers are under maintenance. Use this new time period for the hosts / services that are affected by the maintenance.

abrist wrote:You can do this through timeperiods as well. Create a new timeperiod that excludes (or does not include) the after hours that your servers are under maintenance. Use this new time period for the hosts / services that are affected by the maintenance.

If I use timeperiods to exclude (for example) midnight to 5am, if a host goes down during that time period and remains down past 5am will I get a notification?

Yes. Because the checks will fail once they start after the timperiod starts. Passive checks will trip freshness after the freshness interval as well.