monitor hosts behind firewalls

[mail at catsnest.co.uk]

On Mon, Feb 6, 2012 at 5:54 PM, doug <goldcup at ix.netcom.com> wrote:

> In templates I see the initial check_command pointing to
> 'check-host-alive'. If I comment that out for the boxes behind the FW
> how will nagios react? Or must I replace it with as you suggest a 'dummy
> check'?
>
> All my monitoring is off-site. I monitor my clients firewalls, servers,
> workstations, and some routers if they have static ip. I only need
> 'check-host-alive' for the routers and firewalls, nothing else.
>
>
From:
http://nagios.sourceforge.net/docs/3_0/objectdefinitions.html#host

"check_command: ...If you leave this argument blank, the host will not be
actively checked...."

you normally have to fiddle a little with submitting a passive check to
make it go green


you might as well use the nrpe check as your hosts check_command in stead
of disableing it

it will help with service dependancys so if you loose nrpe assess to your
hosts only the host will alert instead each of its services...



Can you give me an example of a dummy check?
>
> #!/bin/bash
echo "dummy OK"
return 0 ;







--
Ritchie

Thanks
>
> -----Original Message-----
> From: mail at catsnest.co.uk
> Reply-To: mail at catsnest.co.uk, Nagios Users List
> <nagios-users at lists.sourceforge.net>
> To: Nagios Users List <nagios-users at lists.sourceforge.net>
> Subject: Re: [Nagios-users] monitor hosts behind firewalls
> Date: Mon, 6 Feb 2012 10:39:26 +0000
>
>
>
> On Mon, Feb 6, 2012 at 2:57 AM, doug <goldcup at ix.netcom.com> wrote:
>        Hi Everyone,
>
>        I currently monitor various hosts behind firewalls, windows
>        servers,
>        linux, and some workstations. I have them all setup as active
>        hosts that
>        nagios pings to indicate they are up. Since they are all behind
>        firewalls all I'm doing for host status is in fact just pinging
>        the
>        firewall. I'm a little confused about using passive checks and
>        not sure
>        if this is the right way to go about doing what I want. I
>        monitor the
>        firewall and know that is up, and for all those hosts behind I'm
>        just
>        pinging the fw, no need to do that. I use nrpe or nsclient to
>        monitor
>        the services and really that's all I need. Can someone point me
>        in the
>        right direction so I can stop the active host status pings for
>        all hosts
>        behind the firewalls.
>
>
>
> If you dont want to open up ping on the firewalls you could ether have a
> dummy hosts check (a check that just returns 0) or have nrpe as the
> hosts check (eg a check that just checks if nrpe is responding, again an
> nrpe check that just returns 0 )
>
>
> client nrpe command like this
> command[check_nrpe_alive]=/patch/script/that/returns.0.sh
>
>
> Nagios command:
>
> define command{
>        command_name    check_nrpe_alive
>        command_line    $USER1$/check_nrpe -H $HOSTADDRESS$ -C
> check_nrpe_alive
>        }
>
> define host{
>        name            behind_firewall
>        use             generic-host
>        hostgroups      +behind_firewall
>        register        0
> }
>
> then a use clause in your host config of behind_firewall
>
> Ritchie
> --
> <-- http://23.me.uk/2 -->
> <--Time flies like an arrow; fruit flies like a banana.  -->
>
>
>
>        Thanks
>        Doug
>
>
>
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