Powershell Script to Check if a Website is Up and if Not Restart a service

The below PowerShell script check the website is responding AND doesn’t returns a certain string, if either test is failed then a Windows service is restarted, forcefully if necessary after a grace period.

Please note that I have modified this script to make it more easily customisable and not had the opportunity to test with the strings switched out for the variables. The logic is sound and works.

Also note that this is one code block (word press isn’t a fan of it being one though :-/
You can download the file here CheckWebsiteIsUp.ps1

$webClient = new-object System.Net.WebClient
$webClient.Headers.Add("user-agent", "PowerShell Script")


#Initialising
$webClient = new-object System.Net.WebClient
$webClient.Headers.Add("user-agent", "PowerShell Script")

#Variables to modify
$output = "" #Define output variable
$serviceName = "confluence" #Short windows service name
$smtpServerName = "smtp.website.com" #SMTP Server name
$fromEmailAddress = "[email protected]" #Email address for mail to come from/reply address
$stringToCheckFor = "The service is unavailable" #String to check for. Note that this will be searched for with wildcards either side
$startTime = get-date
$output = $webClient.DownloadString("http://www.website.com/") #Modify this url to be the url you want to test
$endTime = get-date

#Main workload
#The below checks for the string "The service is unavailable" from your website and if found forcefully restarts the defined service
if ($output -And $output -notlike "*$stringToCheckFor*") {
"Site Up`t`t" + $startTime.DateTime + "`t`t" + ($endTime - $startTime).TotalSeconds + " seconds"
} else {
"Fail`t`t" + $startTime.DateTime + "`t`t" + ($endTime - $startTime).TotalSeconds + " seconds"
stop-service $serviceName -force
"Stop Service Command Sent"
$svc = Get-Service $serviceName
$svc.WaitForStatus('Stopped','00:05:00') #Waits for service to enter stopped state or 5 mins has passed, whichever is first
get-service $serviceName | where-object {$_.Status -eq "Stopped"} | restart-service #Belt and braces but only restarts the service if it's stopped.
$svc.WaitForStatus('Running','00:01:00') #Waits for service to enter Running state or 1 minute to pass, whichever is first
Send-MailMessage -From “[email protected]” -To “$fromEmailAddress” -SmtpServer “$smtpServerName” -Subject "$serviceName Service Restarted" -Body "$serviceName Service Restarted" #Sends an email alert that the service was restarted
}

One thought on “Powershell Script to Check if a Website is Up and if Not Restart a service

  1. Thanks, this script came in handy. I changed -notlike to -like and instead checked for known good data, anything else is treated as failure. Works well. Also you can use try and catch for “$webClient.DownloadString” so that a timeout failure which normally throws an error won’t stop the script. Thanks again.

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