Using SSH to run remote command checks

[Robert Smith]

Make sure that your SSHD allows the number of processes to be spawned
that you need.

I have:
MaxStartups 100

in my /etc/ssh/sshd_config which allows me to use my ssh gateway to
check up to 100 service concurrently with Nagios.

(you may need an updated version of openssh. get it from
ftp.openbsd.org/pub/OpenSSH/portable/)

I prefer to stay away from NRPE on unix systems.

Cheers,

-Robert Smith

Nagios Mail wrote:
> I wanted to update this problem as it appears to have never been
> resolved. The current version of check_by_ssh still returns an
> "UKNOWN" status in nagios. I have ran the command manually from the
> command line and echoed $?, and while it does return 0, nagios is
> putting in an UNKNOWN status. Not only that but the status appears to
> be flapping.
>
> The Critical and Warning status appear to work every time, but when an
> OK status is returned from one of the check programs (check_load,
> check_disk, check_process), check_by_ssh returns an UNKNOWN almost 80%
> of the time.
>
> I've followed up with three different people on this list who have
> reported the problem, and all of them just decided to move to NRPE.
>
> Has anyone gotten this plugin to work? I am assuming this is a code
> problem with check_by_ssh
>
>
>
> On 12/22/05, *Demetri Mouratis* <dmourati at cm.math.uiuc.edu
> <mailto:dmourati at cm.math.uiuc.edu>> wrote:
>
>     On Thu, 22 Dec 2005, Mark.Law at thomson.com
>     <mailto:Mark.Law at thomson.com> wrote:
>
>     > I tested the following command from the command line ~
>     >
>     > /usr/bin/ssh -l nagios host1 chkAdminServer.pl
>     >
>     > and it returns OK with an exit code of 0.  Great.
>     >
>     > When I put it into the following service definition, I get a Status
>     > UNKNOWN with STATUS INFORMATION (No Output)
>     >
>     > define service{
>     >  name                            check_adminserver
>     >  service_description             AdminServer
>     >  use                             hg.prod.check_5min
>     >  host                            host1,host2
>     >  contact_groups                  systemgrp
>     >  check_command
>     > check_command_ssh!/path/to/perl/script/bin/chkAdminServer.pl!
>     > }
>     >
>     > The check command definition is really simple also ~
>     >
>     > define command{
>     >  command_name    check_command_ssh
>     >  command_line    /usr/bin/ssh -l nagios $HOSTADDRESS$ $ARG1$
>     > }
>     If you are trying to ssh to another server and kick off the
>     command there
>     use check_by_ssh as follows:
>
>     # check-remote-load
>     define command{
>              command_name    check-remote-load
>              command_line    $USER1$/check_by_ssh -H $HOSTADDRESS$ -C
>     "$USER1$/check_load -w $ARG1$ -c $ARG2$"
>              }
>
>     In your example, put the chkAdminServer.pl scripts in the nagios
>     plugins
>     directory on the target, e.g. /usr/lib/nagios/plugins then set the
>     $USER1$
>     variable to the same.  Then, su - nagios of your nagios box and
>     ssh target
>     /usr/lib/nagios/plugins/chkAdminServer.pl.
>
>
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