check-host-alive check

[Marc Powell]

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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