[Pkg-nagios-devel] Minor dependency issue

David Greaves david@dgreaves.com
Mon, 14 Mar 2005 09:06:52 +0000

sean finney wrote:

>hi david,
>On Sun, Mar 13, 2005 at 09:31:57PM +0000, David Greaves wrote:
>>Should nagios depend on iputils-ping as the netkit-ping package's ping 
>>doesn't support -U or -w which nagios config uses by default.
>okay, how about changing depends to
>Depends: ping | iputils-ping | netkit-ping
Well, my point is that nagios uses the special features only found in 
particularly -w:
       -w deadline
              Specify a timeout, in seconds, before ping exits 
regardless of how many  pack-
              ets  have  been  sent or received. In this case ping does 
not stop after count
              packet are sent, it waits either for deadline expire or 
until count probes are
              answered or for some error notification from network.

without this, I assume that nagios' probes, as configured would hang if 
a host was down...
[sourceforge's cvs browse is down for me so I can't check where/how the 
-w gets put in. I can't find the command line options anywhere in the 
nagios config (it uses check_ping exclusively!) so I'm guessing that 
check_ping uses the local binary and when it failed it returned the ping 
command it was using (ping -n -U -w 10 -c 1 and this is where 
I got the cli args from...]

[later edit: a-ha!!
strings  /usr/lib/nagios/plugins/check_ping  | grep ping includes
  /bin/ping -n -U -w %d -c %d %s
in it's output - I was frantically wondering if I'd been working on 
another bit of monitoring sw <grin>]

So, in my case, nagios just reported everything down (ping used invalid 
args and returned an error indicating the host was down)

The only alternative I see is to have check_ping implement the -w option 
through a timer around the netkit-ping :)

PS New to nagios code so I could be embarrassing myself here - OTOH this 
could help other newbies :)