Set-IisAdvLogging.ps1

$folder4Logs = "X:\AdvancedIISLogs"
$LogRotateFreq = "Hourly"                # Change to your desired frequency 

#Check if we have folder for our logs - if not create one
if(!(Test-Path $folder4Logs))
{
    # Create such a directory
    New-Item -ItemType Directory -Path X:\ -Name AdvancedIISLogs
}

# Assign appropiate permissions
$Acl = Get-Acl $folder4Logs
$Ar = New-Object System.Security.AccessControl.FileSystemAccessRule("IIS_IUSRS", "FullControl", "ContainerInherit,ObjectInherit", "None", "Allow")
$Acl.SetAccessRule($Ar)
Set-Acl $folder4Logs $Acl

# Reconfigure username property - this is to well known bug when this property is not logged in correctly
Set-WebConfigurationProperty -pspath 'MACHINE/WEBROOT/APPHOST'  -filter "system.webServer/advancedLogging/server/fields/field[@id='UserName']" -name "sourceType" -value "BuiltIn"

#Fields we want to be logging 
$RequIisAdvLogFields = "Date-UTC","Time-UTC","Client-IP","Host","Referer","User Agent","Bytes Received","Method","URI-Querystring","URI-Stem","UserName","Protocol Version","BeginRequest-UTC","EndRequest-UTC","Time Taken","Bytes Sent","Status","Substatus","Server-IP","Server Port","Win32Status","X-Forwarded-For","X-Forwarded-Proto","CPU-Utilization"

# logging fields available on server
$availableFields = Get-WebConfiguration "system.webServer/advancedLogging/server/fields"

# configure each site with logging - we dont do that on server level 
foreach($AppName in (Get-Website).Name)
{
    #First add logging format - $appName would be our website name!
    Add-WebConfiguration '/system.webServer/advancedLogging/Server/logDefinitions' -Location $AppName -value @{ rollLogFileOnConfigChanges="true";baseFileName="%COMPUTERNAME%-$AppName"; enabled="true"; logRollOption="Schedule"; schedule=$LogRotateFreq; publishLogEvent="false"}

    # TODO : add filtering....

    # Delay commit of settings ( otherwise each time we would wait )
    Start-WebCommitDelay 
						


    foreach( $singleField in $RequIisAdvLogFields) 
    {
        # Check if collection contains this singlefield
        if ( ($availableFields.Collection | select Id -ExpandProperty Id).Contains($singleField) ) 
        {
            $fieldDetails = ( $availableFields.Collection | ? Id -eq $singleField)
        
            # Add this required field on site level
            Add-WebConfiguration "/system.webServer/advancedLogging/Server/logDefinitions/logDefinition[@baseFileName=""%COMPUTERNAME%-$AppName""]/selectedFields" IIS:\ -Location $AppName -value @{defaultValue="";required="false";logHeaderName=$($fieldDetails.logHeaderName);id=$($fieldDetails.id);}
        }
    }

    #Stop delay
    Stop-WebCommitDelay -Commit $true 


}

# Disable IIS logging on server level
Set-WebConfigurationProperty -Filter "system.webServer/advancedLogging/server/logDefinitions/logDefinition[@BaseFileName='%COMPUTERNAME%-Server']" -name enabled -value false

# Disable standard logging
Set-WebConfigurationProperty -Filter system.webServer/httpLogging -PSPath machine/webroot/apphost -Name dontlog -Value true

# Enable advanced logging 
Set-WebConfigurationProperty -Filter system.webServer/advancedLogging/server -PSPath machine/webroot/apphost -Name enabled -Value true