Monitor IIS AppPool Using NagiosXI and NCPA Agent

[imadc]

Hello Support

On our Systems we have NCPA Agent Version 2.0.4 Running on Web Servers with IIS version 8.5

How can we monitor State/Memory/CPU usage of each IIS AppPool listed on those web servers from NagiosXI version 5.4.13 ?

On this site I have seen examples for NRPE/NSClient++ Agent on https://outsideit.net/monitoring-iis-application-pools/

Can you recommend how we can do it with NCPA please?

Thanks

[lmiltchev]

I haven't really tested this, but I don't see why not call the "check_ms_iis_application_pool.ps1" script via check_ncpa.py. You could define a similar command (as the one in the NSClient++ example) in the ncpa.cfg, place your PS script in the NCPA plugins directory, and restart the NCPA_Listener. Test your check from command line on the Nagios XI server (or from the GUI - https://x.x.x.x:5693/gui/api/plugins/ch ... n_pool.ps1).

If it works fine, add a new service to your host.

Hope this helps.

[imadc]

Hello lmiltchev

I tried what you mentioned after placing the script under C:\Program Files (x86)\Nagios\NCPA\plugins then restarted services

When I try to hit the command through the NagiosXI box - I am getting the following

[root@rdnagios libexec]# sudo /usr/local/nagios/libexec/check_ncpa.py -H X.X.X.X -t xXX58UPa -M "agent/plugin/check_ms_iis_application_pool.ps1" -a "-A AppName"
CRITICAL: Cannot retrieve the dynamic parameters for the cmdlet. Retrieving the COM class factory for component with CLSID {688EEEE5-6A7E-422F-B2E1-6AF00DC944A6} failed due to the following error: 80040154 Class not registered (Exception from HRESULT: 0x80040154 (REGDB_E_CLASSNOTREG)).


When I try from within the web server - I am getting the following
https://X.X.X.X:5693/gui/api/plugins/ch ... n_pool.ps1
I am getting 404 The page you are looking for was not found.

Even though through powershell I tested the powershell script and it working fine
PS C:\Program Files (x86)\Nagios\NCPA\plugins> .\check_ms_iis_application_pool.ps1 -A AppPool
CRITICAL: Application Pool "AppPool" is Stopped.

Anything else that I need to change to make it work from NagiosXI server?

Thansk
Imad

[npolovenko]

@imadc, In the web browser please type:

Code: Select all

https://192.168.3.145:5693

*Replace my IP address with yours.

Next, go to the API tab in the top level menu. Under API Endpoint dropdown choose plugins, and on the next line choose check_ms_iis_application_pool.ps1.

Next, click on the "View in Alternative Format" button in the buttom left corner of the screen -> As active check using NCPA.py.

Let us know what output you get.

[imadc]

When I try to reload the plugins under API
Nothing will be changed on the screen

[imadc]

Do I have to to change anything in NCPA configuration files after I place the powershell script under plugins folder?

[lmiltchev]

Yyou placed your plugin into the "C:\Program Files (x86)\Nagios\NCPA\plugins\" directory, correct? Can you confirm?

The plugin's path is specified in the ncpa.cfg file.

Example:

Code: Select all

[plugin directives]
#
# Plugin path where all plugins will be ran from.
#
plugin_path = plugins/

Does yours look the same?

I am not able to recreate the issue that you are having. As you can see below, all of the plugins in the "C:\Program Files (x86)\Nagios\NCPA\plugins\" directory are listed under the API:

example01.PNG

Note: I am running NCPA ver. 2.1.3. The version, that you are running (2.0.4) is somewhat old. I am not sure if this is what is causing the issue, however I would recommend that you upgrade to the latest version of NCPA agent, which is 2.1.4 at the moment.

[imadc]

Thanks @lmiltchev

As recommended I upgraded the NCPA version 2.1.4

Now I am able to see the plugins loaded with the scripts, now I can test it out form the GUI and from NagiosXI

[lmiltchev]

Great! I am glad to hear that!

Do you have any more questions or it is OK to close this topic?

[imadc]

We are almost there
The IIS powershell script need to run under x64 since the commands like Get-WebAppPoolState will fail for example with the following error

{
"returncode": 3,
"stdout": "get-webitemstate : Retrieving the COM class factory for component with CLSID \n{688EEEE5-6A7E-422F-B2E1-6AF00DC944A6} failed due to the following error: \n80040154 Class not registered (Exception from HRESULT: 0x80040154 \n(REGDB_E_CLASSNOTREG)).\nAt C:\\Program Files (x86)\\Nagios\\NCPA\\plugins\\test2.ps1:3 char:1\n+ $AppPool_Status = (Get-WebAppPoolState $args[0]).Value\n+ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~\n + CategoryInfo : NotSpecified: (:) [Get-WebItemState], COMExcepti \n on\n + FullyQualifiedErrorId : System.Runtime.InteropServices.COMException,Micr \n osoft.IIs.PowerShell.Provider.GetItemStateCommand\n \nDefaultAppPool Current Status is"
}

------------------------------------------------

I added the following powershell path under ncpa.cfg to see if that forces powershell to run under x64 but it keeps running it under x86
c:\Windows\Sysnative\WindowsPowerShell\v1.0\


# Since windows NCPA is 32-bit, if you need to use 64-bit powershell, try the following for
# the powershell plugin definition:
# .ps1 = c:\windows\sysnative\windowspowershell\v1.0\powershell.exe -ExecutionPolicy Unrestricted -File $plugin_name $plugin_args
#

# Linux / Mac OS X
.sh = /bin/sh $plugin_name $plugin_args
.py = python $plugin_name $plugin_args

# Windows
#.ps1 = powershell -ExecutionPolicy Bypass -File $plugin_name $plugin_args
.ps1 = C:\Windows\SysWOW64\WindowsPowerShell\v1.0\powershell.exe -ExecutionPolicy Unrestricted -File $plugin_name $plugin_args
.vbs = cscript $plugin_name $plugin_args //NoLogo
.bat = cmd /c $plugin_name $plugin_args



Is this a limitation because NCPA agent runs under x86?

Knowing that we are runnning the NCPA agents under Windows Server 2012 R2 X64 OS