How to recycle appool when IIS getting slow response by using Powershell? - powershell

Question

I am trying to write a script to check health of my web application's health status. Forexample if I couldn't get message in 10 seconds I have to recycle my apppool by using Powershell.Or except 200-ok codes, my app pool should recycled.
Please look at below code and ERROR:
# Load IIS module:
Import-Module WebAdministration
while ($true) {
write-host 'Runnig For Check app.xxx.com ...'
# First we create the request.
$HTTP_Request = [System.Net.WebRequest]::Create('https://app.xxx.com/')
Try
{
# We then get a response from the site.
$HTTP_Response = $HTTP_Request.GetResponse()
# We then get the HTTP code as an integer.
$HTTP_Status = [int]$HTTP_Response.StatusCode
If ($HTTP_Status -eq 200) {
Write-Host "Site is OK!"
}
Else {
Write-Host "The Site may be down, please check!"
Restart-WebAppPool -Name "app.xxx.com"
}
}
Catch
{
Stop-WebAppPool -Name "app.xxx.com"
Restart-WebAppPool -Name "app.xxx.com"
}
# Finally, we clean up the http request by closing it.
$HTTP_Response.Close()
Start-Sleep -Seconds 120
}
Error:
Restart-WebAppPool : You have to start stopped object before
restarting it. At C:\Scripts\CheckHealthHaydigo.ps1:25 char:6
+ Restart-WebAppPool -Name "app.xxx.com"
+ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+ CategoryInfo : InvalidOperation: (:) [Restart-WebAppPool], InvalidOperationException
+ FullyQualifiedErrorId : InvalidOperation,Microsoft.IIs.PowerShell.Provider.RestartAppPoolCommand

Answer 1

It seems like you should check the status of the app pool before trying to restart it.
if ((Get-WebAppPoolState -Name "app.xxx.com").Value -eq "Stopped") {
Start-WebAppPool -Name "app.xxx.com"
}
else {
Restart-WebAppPool -Name "app.xxx.com"
}