How to monitor Application Request Routing via PowerShell

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Dear readers,

Welcome backWinking smile. Today I want to discuss with you how to monitor Application Request Routing via PowerShell script. In case that you are wondering what ARR is, probably you have to give a look at following link: https://www.iis.net/downloads/microsoft/application-request-routing

Of course ARR has some tools and performance counters available to monitor its status, like:

Anyway, there are scenarios where it is required a script to monitor how ARR server and application servers work. In a scenario like this, you could use PowerShell. The following example shows an example of script.

 #####################################################################################
 # THIS IS SAMPLE CODE AND IS ENTIRELY UNSUPPORTED. THIS CODE AND INFORMATION        #
 # IS PROVIDED "AS-IS" WITHOUT WARRANTY OF ANY KIND, EITHER EXPRESSED OR IMPLIED,    #
 # INCLUDING BUT NOT LIMITED TO AN IMPLIED WARRANTY OF MERCHANTABILITY AND/OR        #
 # FITNESS FOR A PARTICULAR PURPOSE.                                                 #
 #####################################################################################
  
 # First add a reference to the MWA dll
 $dll=[System.Reflection.Assembly]::LoadWithPartialName("Microsoft.Web.Administration")
  
 #Get the manager and config object
 $mgr = new-object Microsoft.Web.Administration.ServerManager
 $conf = $mgr.GetApplicationHostConfiguration()
  
 #Get the webFarms section
 $section = $conf.GetSection("webFarms")
 $webFarms = $section.GetCollection()
  
  
 foreach ($webFarm in $webFarms)
 {
     $Name= $webFarm.GetAttributeValue("name");
     #Get the servers in the farm
     $servers = $webFarm.GetCollection()
     Write-Host  "Farm Name: " $Name
     foreach($server in $servers)
     {
          $ip= $server.GetAttributeValue("address")
          #Get the ARR section
          $arr = $server.GetChildElement("applicationRequestRouting")
          $counters = $arr.GetChildElement("counters")
          $isHealthy=$counters.GetAttributeValue("isHealthy")
          $state= $counters.GetAttributeValue("state")
          switch ($state) 
          { 
                 0 {$state= "Available"} 
                 1 {$state= "Drain"} 
                 2 {$state= "Unavailable"} 
                 default {$state= "Non determinato"}
          }
  
         if( $isHealthy)
         {
             $isHealthy="Healthy"
         }
         else
         {
             $isHealthy="Not Healthy"
         }        
          Write-Host -NoNewLine $ip  " " $state " " $isHealthy
          #NEW LINE
          Write-Host
     }
     #NEW LINE
     Write-Host
 }

Output shows all web farms installed on your server plus the status of each application server.

Enjoy your script

HTH

Carmelo