"Last check" info seems stale (Nagios 2.9)

[Marc Powell]

On Jun 19, 2009, at 4:33 PM, Kustner, Tom wrote:

> I am a Nagios user, not the administrator.  We are running Nagios  
> 2.9 on RHEL 4 or 5.  Overall, 200+ hosts with 3000 services being  
> monitored, but I have access for monitoring a smaller number of hosts.
>
> In looking last week into an issue where a host had gone down but no  
> alert was sent, I noticed that on the "Host Status Details For All  
> Host Groups" screen, where it lists Hosts, Status, Last Check, etc.,  
> the Last Check date for some of the hosts went back almost two  
> months.   I pointed this out to the administrator who didn't  
> disagree with my statement but said the logs showed otherwise.   
> Nagios was restarted but even now, there is a host where the Last  
> Check date still shows as 05-19-2009.  There are other hosts showing  
> a last check date of June 5, June 9, June 10, and so on.  These  
> hosts are definitely up.
>
> Either Nagios is being tardy at checking things, is *not* being  
> tardy but is displaying inaccurate information, or I am  
> misunderstanding this field or what Nagios means by "Last check".   
> Can anyone shed some light?

This is normal. Hosts aren't checked unless a service on the host  
returns a non-OK result. If all services are up, the host must be up  
so there is no reason to check it. If a service returns a non-OK  
result, only then do you need to know if the host is down or not and a  
host check is run. As for the host being down and no notification  
being sent, you should verify that it has services defined for it,  
they return non-OK results when the host is down and that the host  
check returns a non-OK result when the host is down.

Of course, your admin is the best person to check these things.

--
Marc


------------------------------------------------------------------------------
Are you an open source citizen? Join us for the Open Source Bridge conference!
Portland, OR, June 17-19. Two days of sessions, one day of unconference: $250.
Need another reason to go? 24-hour hacker lounge. Register today!
http://ad.doubleclick.net/clk;215844324;13503038;v?http://opensourcebridge.org
_______________________________________________
Nagios-users mailing list
Nagios-users at lists.sourceforge.net
https://lists.sourceforge.net/lists/listinfo/nagios-users
::: Please include Nagios version, plugin version (-v) and OS when reporting any issue. 
::: Messages without supporting info will risk being sent to /dev/null