Monitoring software question

S. Dale Morrey sdalemorrey at gmail.com
Wed Oct 9 13:50:00 MDT 2013


Almost forgot the link
http://dnx.sourceforge.net/


On Wed, Oct 9, 2013 at 1:48 PM, S. Dale Morrey <sdalemorrey at gmail.com>wrote:

> 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 xmission.com>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
>> NPRE
>> > 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
>> NRPE
>> 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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>>
>
>


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