Monitoring disk usage

[Juki]

Hi Guy,

Many thanks for your post.

I decided to go with Option (1) as per your description and did the
following in the nrpe.cfg file on the monitored host:

command[check_disk]=/usr/local/nagios/libexec/check_disk -w 30% -c 20% -p /
command[check_var]=/usr/local/nagios/libexec/check_disk -w 30% -c 20% -p
/var
command[check_server1]=/usr/local/nagios/libexec/check_disk -w 30% -c 20% -p
/var/opt/BGw/Server1
command[check_ora]=/usr/local/nagios/libexec/check_disk -w 30% -c 20% -p
/var/opt/mediation/ora


And then on the nagios monitoring server I have this:

define service{
        use                             generic-service         ; Name of
service template to use
        host_name                       emm4
        service_description             Root Partition
        check_command                   check_nrpe!check_disk!15%!10%!
        }

define service{
        use                             generic-service         ; Name of
service template to use
        host_name                       emm4
        service_description             var Partition
        check_command                   check_nrpe!check_var!30%!20%!
        }

define service{
        use                             generic-service         ; Name of
service template to use
        host_name                       emm4
        service_description             server1 Partition
        check_command                   check_nrpe!check_server1!30%!20%!
        }

define service{
        use                             generic-service         ; Name of
service template to use
        host_name                       emm4
        service_description             ora Partition
        check_command                   check_nrpe!check_ora!30%!20%!
        }


When I log into the nagios Web GUI, the services for the ora, server1 and
var partition have been successfully created. However, looking at the
"status information" column, I have the following errors:

"NRPE: Command 'check_ora' not defined"
"NRPE: Command 'check_server1' not defined"
"NRPE: Command 'check_var' not defined"

This indicates that I need to explicitly define 'check_ora', 'check_server1'
and 'check_var' elsewhere. So, where else must I define these services so as
to clear out the errors above?

Thanks in advance!






2009/7/15 Guy Waugh <guidosh at gmail.com>

> Hi Juki,
>
> As I understand it, you can either (1) 'hard-code' your NRPE checks in the
> nrpe.cfg file on the monitored host (so that the checks are explicitly
> defined), or (2) set up NRPE on the monitored host in such a way that you
> can pass arguments in your NRPE checks. It looks like you're landing
> somewhere between the two with your configuration.
>
> I would either go the Option (1) way, having something like this in your
> nrpe.cfg file on the monitored host:
> *command[check_root]=/usr/local/nagios/libexec/check_disk -w 30% -c 15% -p
> /
> **command[check_var]=/usr/local/nagios/libexec/check_disk -w 30% -c 15%**-p /var
> **command[check_server1]=/usr/local/nagios/libexec/check_disk -w 30% -c
> 15%** -p /var/opt/BGw/Server1
> **command[check_ora]=/usr/local/nagios/libexec/check_disk -w 30% -c 15%**-p /var/opt/mediation/ora
> *
>
> , and then having services on the nagios host like this:
>
> *define service{
>         use                             generic-service         ; Name of
> service template to use
>         host_name                       emm4
>         service_description             Root Partition
>         check_command                   check_nrpe!check_root
>         }*
>
> Alternatively, for the Option (2) method, on the monitored host, in
> nrpe.cfg:
>
> *command[check_disk]=/usr/local/nagios/libexec/check_disk -w $ARG1$ -c
> $ARG2$ -p $ARG3$*
>
> , and a service example on the nagios host:
>
> *define service{
>         use                             generic-service         ; Name of
> service template to use
>         host_name                       emm4
>         service_description             Root Partition
>         check_command                   check_nrpe!check_disk!30!15!/
>         }*
>
> I may not have the syntax in the 'check_command' of that last service
> exactly right, but that's the general idea.
>
> To go down the Option 2 road, you have to have configured the NRPE daemon
> on the monitored host with '--enable-command-args', and have to have a line
> in your nrpe.cfg file that says 'dont_blame_nrpe=1'. This is because
> allowing command arguments in this fashion can be a security risk. The
> default nrpe.cfg file has some comments that refer to this.
>
> HTH,
> Guy.
>
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