Restarts named application pool if stopped, writes restart event to the Windows Application Event Log.

AppPoolResurrector.ps1

# restarts named app pool if stopped, writes restart event to the Application Event Log
# Peter Tyrrell, May 13 2013

param(
    [string[]]$names = (,"ISAPI Webpublisher")
)

# If OS < Server 2008 R2, install Powershell snap-in for IIS and uncomment:
#Add-PSSnapin WebAdministration

$evtsrc = "AppPool Resurrector"

if ( [System.Diagnostics.EventLog]::SourceExists($evtsrc) -eq $false){
    New-EventLog -LogName Application -Source $evtsrc
}

foreach ($name in $names) {
    if ((Get-WebAppPoolState $name).Value -ne "Started") {
        Start-WebAppPool $name
        Write-EventLog -LogName Application -Message "Started Application Pool `"$name`" because it was found stopped." -Source $evtsrc -EntryType Warning -EventId 666 -Category 0
        echo "Started Application Pool `"$name`" because it was found stopped."
    }
    else {
        Write-EventLog -LogName Application -Message "Checked running state of `"$name`" app pool." -EntryType Information -EventId 0 -Category 0 -Source $evtsrc
        echo "Checked running state of `"$name`" app pool."
    }
}


<#

App Pool Resurrector License

Copyright © 2013 Peter Tyrrell and Andornot Inc.

Permission is hereby granted, free of charge, 
to any person obtaining a copy of this software 
and associated documentation files (the “Software”), 
to deal in the Software without restriction, including 
without limitation the rights to use, copy, modify, 
merge, publish, distribute, sublicense, and/or 
sell copies of the Software, and to permit persons 
to whom the Software is furnished to do so, 
subject to the following conditions:

The above copyright notice and this permission notice 
shall be included in all copies or substantial portions 
of the Software.

THE SOFTWARE IS PROVIDED “AS IS”, WITHOUT WARRANTY 
OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT 
LIMITED TO THE WARRANTIES OF MERCHANTABILITY, 
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. 
IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS 
BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, 
WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, 
ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE 
OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.

#>