Nagios Support Forum

Hello Nagios Crew,
I am unabl to find this info:
is it possible to tell Nagios not to send service alerts when host goes down or reboots.

Can you help?

Thanks
sandro

This is the default behavior

Hello,
well then I think I have a problem because when I reboot my hosts all checks on services will give me an CRITICAL event ora an UNKNOWN event instead of jus giving me the host DOWN.

Where is this set?
Do I have to define the hosts as parent of the services associated to it?
if true, How is this done?
Thanks
Sandro

Can you send you profile.zip form Admin -> System Profile along with the name of the host that rebooted and the service that alerted?

HEllo Attached the profile.zip
I have also noticed that I never get the hostdown hostup notification.

SAndro

scottwilkerson wrote:along with the name of the host that rebooted and the service that alerted?

I need the name of the host that went down

Hello,
I found out the issue is connected to the check interval we are using which is 5min.
Nearly all servers we have reboot nearly all under 3 min.
I poll (ping for up/down) the server at time T0,
while waiting for the next check at T5, the server reboots at T2.
The nagios server dose a service check (for example) at T3.
The server is still rebooting and I will receive a UNKNOWN notification for the service (agent and Nagios server are not communicating, agent is still not up)
Server starts at T4 (about 4 min to reboot).
I get the OK for all the UNKNOWN notifications.

You can see the sequence in the attached image.
Attached also an updated system profile file.

Thanks
SAndro

So for many of these services you have set the amount of retries before alerting to 2

this means it checks every 5 minutes + 1 minute for the retries, potentially the service could be sending notifications at 3 minutes in.

I would strongly suggest polling the hosts more frequently (every 5 minutes) and setting max_check_attempts to 5 on the services.

This would force the hosts to have checked at least 1 time before a service notification can go out.

These settings would be the default in the Wizards.

Hi Scott,
I have reduced the polling time on hosts (ie ping up/down) to 2 minutes and services are checked every 5min. retry is set to 2 and retry time to 1 min.
I am just a bit worried about the 2 min polling on host (ie ping up/down). Can this be too stressful for the server?
We have around 200 hosts with a predicted size of 500. There is arount 9 services per Host ( this is an avarage value)
We have at the moment a VM with 8 cvcpu and 8 gb of ram.
Thanks
SAndro

nagiosEngie wrote:Hi Scott,
I have reduced the polling time on hosts (ie ping up/down) to 2 minutes and services are checked every 5min. retry is set to 2 and retry time to 1 min.
I am just a bit worried about the 2 min polling on host (ie ping up/down). Can this be too stressful for the server?
We have around 200 hosts with a predicted size of 500. There is arount 9 services per Host ( this is an avarage value)
We have at the moment a VM with 8 cvcpu and 8 gb of ram.
Thanks
SAndro

These ping checks should not be too stressful at all, they are very light weight. However, even if the hosts were polling hosts at 5 minutes you wouldn't run into the issue.

You should be in good shape, and I doubt you will see any difference in system load