[Nagiosplug-help] check_udp question

[Dan Stromberg]

Machines that -send- syslog shouldn't have an active syslog port, but I
believe this is more true on modern linuxes than other *ix systems -
many will listen on the syslog port by default, even though they do not
need to be able to receive syslog data.

However, on a syslog server, there should always be a port you could
check:

network-stats-collector-3-root> nmap -sU nsc-1.nacs -p 514

Starting nmap V. 3.00 ( www.insecure.org/nmap/ )
Interesting ports on network-stats-collector-1.nacs.uci.edu
(128.200.34.41):
Port       State       Service
514/udp    open        syslog                  

Nmap run completed -- 1 IP address (1 host up) scanned in 2 seconds
Thu Mar 31 08:46:43

network-stats-collector-3-root> 


On Thu, 2005-03-31 at 17:43 +0200, Andreas Ericsson wrote:
> Steve Belt <rgpg70> wrote:
> > Hello,
> > 
> > I am fairly new to nagios and have a question about the check_udp
> > plugin.  I am attempting to use the plugin to monitor the syslogd
> > process on several machines.  I am using the following format:
> > 
> > check_udp -H xx.xx.xx.xx -p 514
> > (syslogd listed as 514/udp in /etc/services)
> > 
> > However, whenever I run the command I always get the following results:
> > 
> > No data was recieved from host!
> > No response from host on port 514
> > 
> 
> Syslog is a passive service using datagrams to handle its oneway 
> communication. Checking it over the network won't work; you'll need to 
> use nrpe or ssh to check and see that the process is running.
> 
> > The syslogd process is running on the machine.  If I kill syslogd, the
> > command returns:
> > 
> > No response from host on port 514
> > 
> > which is expected.
> 
> 
> Next time, finish your mail here...
> 
> >  Does anyone have any ideas/suggestions as to why
> > this is occurring and how to fix/workaround it?
> > 
> 
> ... since this question right above is fairly implicit by your problem.
> 
> > Thanks,
> > 
> 
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