#From: http://www.herlitz.nu/2017/11/07/enable-IIS-preloadEnabled-and-AlwaysRunning-using-PowerShell/
### Enable if required
#Import-Module ServerManager
#Add-WindowsFeature Web-Scripting-Tools

Write-Host "*** Start IIS Settings Optimization Script ***"
Import-Module WebAdministration

#Set the site name
$siteName = "Default Web Site"

#Fetch the site
$site = Get-Website -Name $siteName
if (!$site)
{
    Write-Host "Site $siteName could not be found, exiting!" -ForegroundColor Yellow
    Break
}

#Fetch the application pools
$appPools = Get-ChildItem "IIS:\AppPools\"

#Fetch the site collection (web apps under the site)
$appCollection = Get-ChildItem "IIS:\Sites\$siteName" | Where-Object {$_.NodeType -eq 'application'}

#Declare apps to preload
$appsToPreload = New-Object System.Collections.ArrayList(,('AuditTrail','FederatedSearch','Forms','Laserfiche','LFCMIS','LDPS','LFDS','LFDSSTS','Mobile','WebLink','Workflow'))
$appsToPreloadUndetected = $appsToPreload.Clone()


#Useful resource on working with IIS recycle times in PowerShell: 
#https://www.habaneroconsulting.com/stories/insights/2013/set-the-specific-times-to-recycle-an-application-pool-with-powershell

#Set to desired daily recycle time
$recycleTimes = @("04:00")

Write-Host "***************************************************"
Write-Host "* Update all IIS AppPools to:                     *"
Write-Host "* -Disable idle timeouts                          *"
Write-Host "* -Schedule consistent app pool recycling time(s) *"
Write-Host "* -Set Start Mode to AlwaysRunning                *"
Write-Host "***************************************************"
Write-Host "`n" 

foreach ($appPool in $appPools) {
    if ($appPool.processModel.idletimeout -ne '0')
    {
        $appPool | Set-ItemProperty  -Name processModel -value @{idletimeout='0'}
        Write-Host "$($appPool.Name) idle timeout disabled" -ForegroundColor Green
    }`
    else 
    {
        Write-Host "$($appPool.Name) already has idle timeout disabled" -ForegroundColor Yellow
    }
    
    #Clear existing recycle schedule and add specified schedule
    #Easier than trying to check all the collection values and ensures setting is correct at the end
    $appPool | Clear-ItemProperty -Name Recycling.periodicRestart.schedule
    foreach ($recycleTime in $recycleTimes) {
        $appPool | Set-ItemProperty -Name Recycling.periodicRestart.schedule -Value @{value=$recycleTime}
        Write-Host "$($appPool.Name) added recycle time at $recycleTime" -ForegroundColor Green
    }

    if ($appPool.Recycling.periodicRestart.time -ne '00:00:00') 
    {
        $appPool | Set-ItemProperty -Name Recycling.periodicRestart -Value @{time='00:00:00'}
        Write-Host "$($appPool.Name) revolving recycling disabled" -ForegroundColor Green
    }`
    else {
        Write-Host "$($appPool.Name) already has revolving recycling disabled" -ForegroundColor Yellow
    }

    if ($appPool.startMode -ne "AlwaysRunning")
    {
        Write-Host "$($appPool.Name) startMode is set to $($appPool.startMode), activating AlwaysRunning"
        
        $appPool | Set-ItemProperty -Name "startMode" -Value "AlwaysRunning"

        Write-Host "$($appPool.Name) startMode is now set to $($appPool.startMode)" -ForegroundColor Green
    } `
    else 
    {
        Write-Host "$($appPool.Name) startMode was already set to $($appPool.startMode) " -ForegroundColor Yellow
    }
    Write-Host "`n"
}
Write-Host "`n"


#Ensure Application Initialization is available
$webAppInit = Get-WindowsFeature -Name "Web-AppInit"

if (!$webAppInit.Installed) #
{
    Write-Host "$($webAppInit.DisplayName) not present, installing"
    Install-WindowsFeature $webAppInit -ErrorAction Stop
    Write-Host "`nInstalled $($webAppInit.DisplayName)`n" -ForegroundColor Green
} `
else 
{
    Write-Host "$($webAppInit.DisplayName) was already installed" -ForegroundColor Yellow
}

Write-Host "**************************************************"
Write-Host "* Activate preloadEnabled on Laserfiche web apps *"
Write-Host "* and the IIS Site instance                      *"
Write-Host "**************************************************"
Write-Host "`n"

#Enable preloadEnabled on the IIS Site instance
if (!(Get-ItemProperty "IIS:\Sites\$siteName" -Name applicationDefaults.preloadEnabled).Value) 
{
    Write-Host "$siteName preloadEnabled is inactive, activating"
    
    Set-ItemProperty "IIS:\Sites\$siteName" -Name applicationDefaults.preloadEnabled -Value True
    
    Write-Host "$siteName preloadEnabled is now set to $((Get-ItemProperty "IIS:\Sites\$siteName" -Name applicationDefaults.preloadEnabled).Value)" -ForegroundColor Green
} `
else
{
    Write-Host "$siteName preloadEnabled already active" -ForegroundColor Yellow
}

#Enable preloadEnabled on Laserfiche web apps
foreach ($app in $appCollection) {
    $appName = $app.Name  
    if (!($app.preloadEnabled)) 
    {
        $preloadFlag = $false
        foreach ($appToPreload in $appsToPreload) {
            if ($app.Name -eq $appToPreload) {

                Write-Host "$appName is in preload list and preloadEnabled is inactive, activating"

                Set-ItemProperty "IIS:\Sites\$siteName\$appName" -Name preloadEnabled -Value $true

                Write-Host "  preloadEnabled is now set to $((Get-ItemProperty "IIS:\Sites\$siteName\$appName" -Name preloadEnabled).Value)" -ForegroundColor Green

                $appsToPreloadUndetected.Remove($appName)

                $preloadFlag = $true
            }
        }
        if ($preloadFlag -eq $false) {
            Write-Host "$appName is not on preload list"
        }
    } `
    else
    {
        $appsToPreloadUndetected.Remove($appName)
        Write-Host "$appName has preloadEnabled already active" -ForegroundColor Yellow
    } 
}

if ($appsToPreloadUndetected.count -gt 0) {
    $appsToPreloadUndetected = $appsToPreloadUndetected -join "`n"
    Write-Host "The following apps on the preload list were not detected in IIS:`n$appsToPreloadUndetected"
}
Write-Host "`n"
Write-Host "***********************************************" -ForegroundColor Green
Write-Host "* IIS Optimization Script Complete            *" -ForegroundColor Green
Write-Host "* Please restart for settings to take effect! *" -ForegroundColor Green
Write-Host "***********************************************" -ForegroundColor Green