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I just discovered that IIS builds up logs indefinitely and there don't appear to be any IIS settings that will automatically clean out old log files. What is the best way to keep my IIS logs under control so that they don't fill the entire hard drive?

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do you want to keep the old ones around in a zip archive, or delete them? – Jeff Atwood Sep 14 '09 at 23:34
You are expected to manage the log files yourself. – Evan Anderson Oct 20 '09 at 14:12
CCLeaner has an option to clean IIS Log Files !!! – Purushottam Latey May 20 at 5:03
up vote 21 down vote accepted

You'll have to run a scheduled task to do it. Here's a Powershell script that should work.

set-location c:\windows\system32\Logfiles\W3SVC1\ -ErrorAction Stop
foreach ($File in get-childitem -include *.log) {
   if ($File.LastWriteTime -lt (Get-Date).AddDays(-30)) {
      del $File

This should purge anything that was last modified more than 30 days ago. Change the path in the first line to wherever your log files are stored. Also change the -30 to however long you want to retain the files. -30 means you will delete anything older than 30 days.

You can have a look at this article that shows different properties for the FileInfo object if you don't want to use LastWriteTime.

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On Windows Server 2008 R2 (PS 2.0) I had to modify the Get-ChildItem call to be Get-ChildItem *.* -include *.log – roryWoods Jun 14 at 13:25

You could brew your own, but i believe some clever person has written this for you already. Check out IISLogs & IISLogs Lite!

If all your doing is deleting the logs, then you can turn logging off if its not needed! you will save your server a lot of I/O!

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Just an update, but IISLogs Lite hasn't been available for some time, and IISLogs is not cheap. – Bacon Bits Jun 13 at 12:58

Well, if you want to clean them up regularly then why don't you disable request logging in IIS? You may use something like google analytics or some other service, I see many people dong this to avoid the headache with IIS logs affecting performance and eating up all disk space but it all depends on your requirements of course.

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Create a scheduled task on the server. In the actions section, you want:

  • Action: Start a Program
  • Settings: Program= Forfiles
  • Add Arguments: -p "C:\inetpub\logs\LogFiles" -s -m . /D -45 /C "cmd /c del @path"
  • Start in: C:\

Give it a daily or weekly schedule. Done.

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Microsoft suggests a script on it's website.

Below is a modified version I'm using for my needs.

Wscript.Echo "Starting log removal"
sLogFolder = "d:\retentiontest"

iMaxAge = 30   'in days
Set objFSO = CreateObject("Scripting.FileSystemObject")
set colFolder = objFSO.GetFolder(sLogFolder)
Wscript.Echo "Removing log files from folder: " & colFolder

For Each colSubfolder in colFolder.SubFolders
        Set objFolder = objFSO.GetFolder(colSubfolder.Path)
        Set colFiles = objFolder.Files
        For Each objFile in colFiles
                iFileAge = now-objFile.DateLastModified
                if iFileAge > (iMaxAge+1)  then
                        Wscript.Echo "Removing File: " & objFile.Name
                        objFSO.deletefile objFile, True

                end if

Note that I've changed from "DateCreated" to "DateLastModified" since counterintuitively date created can be a later than last modified, as can be the case with copied files. You probably don't want to remove files that have been recently updated.

Then run it using cscript.exe (for example, cscript.exe d:\scripts\logRetentionScript.vbs).

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protected by Sven May 20 at 5:28

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