Server Reboot Script

Posted on by administrator

Running a little low on content this last few months, plus I’ve been busy with other work stuff.

I had the requirement to create a PowerShell script that would get the uptime of a server and then decide whether or not the server needed rebooting.

I also wanted the script to randomize the reboot of the servers, that way if there are multiple servers that need rebooting at once, they don’t cause a power spike or resource issues on the hosts. I did this by creating a random number between 1 and 5 and then if the number equals 5, the server is rebooted. If not then the server isn’t rebooted.

This is the script that I ended up with and what is currently being tested:

$loglocation = "C:\scripts\reboot\log"
$dateforfile = Get-Date

#GETS UPTIME IN DAYS
$lastbootuptime = Get-WmiObject win32_operatingsystem
$uptime = (Get-Date) - ($lastbootuptime.converttodatetime($lastbootuptime.lastbootuptime))
$uptimeindays = $uptime.days

#GETS RANDOM NUMBER
$randomnumber = Get-Random -Minimum 1 -Maximum 6

if ($uptimeindays -ge "14"){

 Add-Content -Path "$loglocation\$env:COMPUTERNAME.txt" -Value @"
=====================================================================================
Server restarted at:
$dateforfile
This was an immediate shutdown as the server had been up for $uptimeindays days
"@

 Restart-Computer -Force

}elseif ($uptimeindays -lt "14" -and $uptimeindays -ge "7"){

    if ($randomnumber -eq "5"){

        Add-Content -Path "$loglocation\$env:COMPUTERNAME.txt" -Value @"
=====================================================================================
Server restarted at :
$dateforfile
This was a random restart as uptime was only $uptimeindays days
"@
        Restart-Computer -Force
    }else{

        Add-Content -Path "$loglocation\$env:COMPUTERNAME.txt" -Value @"
=====================================================================================
Server NOT restarted
$dateforfile
This was not randomly restarted. Uptime is currently $uptimeindays days. Random number was $randomnumber
"@
    }
}else{

Add-Content -Path "loglocation\$env:COMPUTERNAME.txt" -Value @"
=====================================================================================
No restart required
$dateforfile
No restart required since uptime is only $uptimeindays days
"@
}

The first time I created this script and set it up as a scheduled task, nothing happened. Turns out that I needed the -Force parameter in order for the server to be rebooted.

This will later be used in a group policy without the log creating as that is only necessary in the testing stage.

Enjoy!

 

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