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Compress IIS Logs with Powershell Script

If you don’t waste your server’s disk space to store IIS Log files then you can create a scheduled task and let the files to be compressed automatically. So we need a piece of code to compress log files and a scheduled task to run the code periodically.

1st step – here is our small powershell code. Copy & save it as “compress-iis-logs.ps1” without quotes.


$LogDir = "C:\inetpub\logs\LogFiles"
$DaysBefore = 7
 
function Zip-Logs
{
    foreach($Dir in Get-ChildItem $LogDir | ?{ $_.PSIsContainer } )
    {
        foreach ($file in Get-ChildItem -Filter *.log $Dir.FullName)
        {
            $TimeSpan = New-TimeSpan ($file.LastWriteTime) (Get-Date)
            $filename = $file.FullName + ".zip"
 
            if ($TimeSpan.TotalDays -gt $DaysBefore)
            {
                #Create Zip
                New-Zip -zipfilename $filename
                #Add file
                $file | Add-Zip -zipfilename $filename
                #Delete the uncompressed file
                $file.Delete()
            }
        }
    }
}
 
function Add-Zip
{
	param([string]$zipfilename)
 
	if(-not (test-path($zipfilename)))
	{
		set-content $zipfilename ("PK" + [char]5 + [char]6 + ("$([char]0)" * 18))
		(dir $zipfilename).IsReadOnly = $false	
	}
 
	$shellApplication = new-object -com shell.application
	$zipPackage = $shellApplication.NameSpace($zipfilename)
 
	foreach($file in $input) 
	{ 
        $zipPackage.CopyHere($file.FullName)
 
        #This waits for the zip operation to finish
        while($zipPackage.Items().Item($file.Name) -Eq $null)
        {
            start-sleep -m 10
        }
	}
}
 
function New-Zip
{
	param([string]$zipfilename)
	set-content $zipfilename ("PK" + [char]5 + [char]6 + ("$([char]0)" * 18))
	(dir $zipfilename).IsReadOnly = $false
}
 
Zip-Logs

2nd step – allow powershell to run unsigned codes to run by executing the code below in Powershell.

set-executionpolicy remotesigned

3rd step – create a new basic daily scheduled task. Choose “Start a program” and click next, type “powershell.exe” (without quotes) for the input of Program/Script then on the “Add arguments” side (below) type the full path and name of your compress-iis-logs.ps1 file. For an instance “C:\inetpub\scripts\compress-iis-logs.ps1” without qouotes.

compress-iis-logs-scheduled-task-parameters

Everything is ok, now your system is able to compress log files automatically.

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