Windows Active Sessions

[Jim Avery]

On 23 January 2012 13:09, Robert Jackson <rab at walkermartyn.co.uk> wrote:
> Does anyone know how to return the number of active sessions from a Windows
> Terminal server? I have installed the NSClient++ service on the Windows
> server and obviously have the NRPE plugin installed on my Nagios host.


Rab,

if I've understood correctly then you can query a Windows performance counter.

I use an entry in the NSClient++ config file in the [External Alias]
section that looks like this:-

  alias_CheckCounter-ts_act_sess=CheckCounter
"Counter:sessions=\Terminal Services\Active Sessions" ShowAll
MaxWarn=40 MaxCrit=50


Then on the Nagios side, the command is simply check_nrpe -H
thehostname -c alias_CheckCounter-ts_act_sess

So the command definition in Nagios is:-


define command{
  command_name    check_nrpe
  command_line    $USER1$/check_nrpe -H $HOSTADDRESS$ -u $ARG1$
  }


And the service definition looks something like this:-

define service{
  use                   srv-pnp,generic-service
  host_name             myhost
  service_description   TS_Active_Sessions
  check_command         check_nrpe!-c ts_act_sess
  notes                 Number of Terminal Services Active Sessions
  contact_groups        notify-engineers
}


There are lots of similar ways to do this sort of think using
NSClient++.  Precisely how you set it up depends a bit on how
obsessive you are about security and your particular preference.

The method shown above means you can have allow_arguments=0 and
allow_nasty_meta_chars=0 in the [nrpe] section which is good for
security.  The downside is that if you need to change the warning
theshold, you have to edit the nsc.ini file on the target system.

hth,

Jim

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