Nagios communication - NRPE doubt
Marc Powell
marc at ena.com
Tue Oct 20 17:53:06 CEST 2009
On Oct 20, 2009, at 10:32 AM, akp geek wrote:
> Hi all
> I have a question on how NRPE works. I have
> installed Nagios on one server1 and Nrpe on server2. they are on the
> same subnet.
>
> the way I execute the commands on the server2 is Server1:nrpe!
> commandonServer2
>
> It works fine now. both servers are on the same subnet. But if I
> would like to monitor a server outside the firewall, Is there
> particular port that needs to be opened or how does that
> communication work?
Nagios calls check_nrpe locally which contacts NRPE on the remote host
on the port specified by the check_nrpe command line (look at the
command{} definition for nrpe). You can change the port that NRPE uses
in nrpe.cfg on the remote host. You'll also need to change the
check_nrpe command line to match. If the remote host is behind a
firewall that restricts access, you'll need to ensure that TCP access
to that port is permitted.
--
Marc
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