Powershell: Monitor IIS Application Pool or Site

We have an exchange IIS Application Pool stopping every so often because of some Entourage client problems. It would cause the Application Pool to stop and therefore break owa access, which was a problem.

So while we are working with Microsoft on a permanent solution I quickly put together a powershell script to run every 30 seconds and check the state of the application pool. If the MSExchangeOWAAppPool is stopped, then the script starts it. It uses the IIS Provider Tools snapin for powershell.

### -----------------------------------------------
### Written by Matt Brown - 12:46 PM 11/3/2008
### Powershell script to check MSExchangeOWAAppPool
### Requires IIS Administration Provider Tools
### -----------------------------------------------

### Make sure Snapin is loaded
$add = 1
get-PSSnapin * | foreach {
 if($_.Name -match 'IIsProviderSnapIn') {
  $add = 0
 }
}
if($add) {
 add-PSSnapin IIsProviderSnapIn
}

#######################################
######## Check AppPool State ##########
#######################################
Write-Host "`n"
Write-Host "#####################################"
Write-Host "Running check on MSExchangeOWAAppPool"
Write-Host "#####################################"
while($true) {

 $state = Get-WebItemState IIS:\AppPools\MSExchangeOWAAppPool
 if($state -eq "Stopped") {
  Start-WebItem IIS:\AppPools\MSExchangeOWAAppPool
  $now = Get-Date –f "yyyy-MM-dd HH:mm:ss"
  $MsgBody = "CAS01 AppPool needed a restart " + $now
  Write-Host $MsgBody
 }
 Start-Sleep -s 30
}