Lots of hosts, only a couple of services?

[Demetri Mouratis]

On Tue, 24 Aug 2004, Jason Byrns wrote:

> Here's part of the problem: If any device misses a single service check,
> a host check is immediately triggered.  But sometimes a device can miss
> a ping even though there is no problem, just a burst of network traffic.
>
> So here's my question: how can I improve our Nagios setup?
>
> Here are my goals:
> 1) Prevent false positives with max_check_attempts (set to 5)
> 2) Get Nagios to respect max_check_attempts
> 3) Have the Status Map correctly show situation if any devices are down.
>
> Could I...
> 1) Check telnet instead of just pinging these devices?  (And change the
> host checks back to the regular host_check_alive?)
> 2) Not check services at all, unless necessary, and only do host checks?
>   (Nagios throws lots of warnings if you do this, and I suppose I'd
> rather avoid that)
> 3) ...?  (Profit?)
>

Jason,

Sounds like the source of your problem is that the service check and host
check are both ultimately using PING.  I think you could remedy your
problem with your suggestion 1 above, check telnet instead of, or better
yet in addition to, PING.  A successfull check of the telnet service
should cause Nagios to bypass the forced host check.

One other suggestion is to modify the paramaters of the check_ping and
check_host_alive invocations to send and expect say 20 packets.  You might
also try increasing the warning and critical packet loss paramters.
These changes would allow you to weather the storm of the network traffic
burst without sending out premature false alarms.

Ohh, and make sure to bitch at your network guys for dropping those
packets in the first place ;-)

Hope that helps.
---------------------------------------------------------------------
Demetri Mouratis
dmourati at linfactory.com



-------------------------------------------------------
SF.Net email is sponsored by Shop4tech.com-Lowest price on Blank Media
100pk Sonic DVD-R 4x for only $29 -100pk Sonic DVD+R for only $33
Save 50% off Retail on Ink & Toner - Free Shipping and Free Gift.
http://www.shop4tech.com/z/Inkjet_Cartridges/9_108_r285
_______________________________________________
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