Monitoring software question

S. Dale Morrey sdalemorrey at
Wed Oct 9 13:48:57 MDT 2013

DNX is also a good solution for this although it's been years since I last
looked at it and I'm not sure it runs with current Nagios.

On Wed, Oct 9, 2013 at 12:14 PM, Jacob Albretsen <jakea at> wrote:

> On Wednesday, October 09, 2013 02:07:40 PM Dan Egli wrote:
> > On October 7, 2013, at 8:37pm, Brian Christiansen wrote:
> > > NRPE: Active Check (Nagios initiating the check
> > >
> > > NSCA: passive check (the server initiating the check)
> >
> > Now I'm lost. I thought Nagios ran on the server? If it does, how does
> > have Nagios initiate the check and NSCA have the server initiate the
> check.
> > That would be the same thing, wouldn't it?
> NRPE runs on clients you want to monitor and listens on port 5666 by
> default.
> You can also limit it to the IP if you have multiple IPs on the box.
>  Nagios
> plugins to check items is also installed on the client.  The Nagios server
> can
> then run check_nrpe with a command to check a particular item on the NRPE
> client, which it then contacts and sends the command.  The client has an
> nrpe
> file which defines what those commands are.  There is some flexibility
> here which
> can have an impact on security if you enable it (see the docs).  So NRPE
> on a
> client doesn't do checks by itself, it just does the checks it is told to
> do
> by the Nagios server.  Each command is one connection from the Nagios
> server
> to the NRPE client.  So if you run 20 checks, Nagios server connects to
> client 20 times.
> NSCA I have never used, but IIRC, basically the clients runs the checks on
> its
> own schedule you define and reports the results back to the Nagios server.
>  The
> Nagios Server is set up to listen for these "reports" from various NSCA
> clients.  The upside of this is NSCA can do 20 checks, and then report
> back to
> the Nagios server the results in one connection.
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