check-host-alive check

[mariog at absi.be]

Hello all,
and thank you i found the check-host-alive in the files checkcommands.cfg 
in the nagios conf directory. 
now what is startles me is that there are 100% packet loss however the 
host is up in nagios, it just the service check-host alive that is 
critical; what are the arguments of nagios to say that a host is up or 
down.. i thought it was a ping but if the ping from the nagios server to 
the host doesn't work how can it say it's up? 

are all host up by default? how can you make them down when a ping cannot 
be performed. 
in the host status information there is NA still the host is shown as up.. 


thank you very much for your help 



Mario Garcia Ortiz/ABSI



Marc Powell <marc at ena.com> 
04/02/2009 07:02 PM

To
nagios-users ML <nagios-users at lists.sourceforge.net>
cc

Subject
Re: [Nagios-users] check-host-alive check







On Feb 4, 2009, at 11:18 AM, mariog at absi.be wrote:

>
> Hello all
> can anyone help me with this;
> there a few hosts mostly adsl or sdsl routers dat have critical 
> state with plugin timed out.
>
> the critical error is :
> check-host-alive critical plugin timed out after 10 seconds.
>
> i cannot find in nagios plugins directory any check named check-host- 
> alive, it seems to be an embedded nagios check when the host is 
> defined? despite this the host is up.
>
> can someone help me how does it work and where is this check-host- 
> alive check stored in a regular nagios install under solaris 10.


Hello,

Your host{} definition (
http://nagios.sourceforge.net/docs/3_0/objectdefinitions.html#host 
) specifies a check_command of 'check-host-alive'.

There exists a command{} definition (
http://nagios.sourceforge.net/docs/3_0/objectdefinitions.html#command 
) named check-host-alive that probably uses a command_line specifying 
the check_ping plugin, along with some flags for it. Grep your config 
files for it to see where it lives (varies with version and personal 
configuration).

The check_ping plugin does have a flag that you can pass to it to 
extend the timeout --

$ /usr/local/nagios/libexec/check_ping --help
...
  -t, --timeout=INTEGER
     Seconds before connection times out (default: 10)

You can modify the command{} definition above to also pass the -t flag 
with a higher timeout (-t 30, for example).

You'll also want to verify that the master nagios host check timeout 
value (host_check_timeout in nagios.cfg - 
http://nagios.sourceforge.net/docs/3_0/configmain.html) 
  to be higher than your highest plugin specific timeout. You'll need 
to reload nagios after making these changes.

HTH,

--
Marc


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