This is a PowerShell script which can be used to deploy web applications to IIS. Therefore you may use to automate your deployments.

create-web-application-in-iis.ps1

<# 	.SYNOPSIS 
		create-web-application - Automatic website creation. 
	.DESCRIPTION     
		Allows you to create a website and its ApplicationPool.
	.NOTES     
		File Name  	: create-web-application.ps1     
		Author     	: Muzikayise Flynn Buthelezi - muzi@mfbproject.co.za
		Copyright	: MFBproject mfbproject.co.za
	.EXAMPLE
    	PS D:\>create-web-application.ps1 -SiteName TESTSITE -Port 8080 -Environment PREPROD -Runtime v4.0 -Pipeline Classic
    	Creates a website named 'TESTSITE-PREPROD', listening on the TCP8080 port, responding to 'http://*' (default value). The associated ApplicationPool 'TESTSITE' running with the identity 'NetworkService' (default value), v4.0 .NET Framework managed runtime and 'Classic' managed pipeline mode.
#>
Param(
	[Parameter(Mandatory=$true, HelpMessage="You must provide a display name for the website.")]
	$SiteName = "testsite",
	$Port = "8080",
	#[ValidatePattern("([\w-]+\.)+[\w-]+(/[\w- ;,./?%&=]*)?")]
	$HostName = "",
	[ValidateSet("PROD", "PREPROD", "INTEG", "QUAL", "DEV")]
	$Environment = "PROD",
	[ValidateSet("0", "1", "2", "3", "4")]
	$Identity = "2",
	[ValidateSet("v1.1", "v2.0", "v4.0")]
	[string]$Runtime = "v4.0",
	[ValidateSet("Classic", "Integrated")]
	[string]$Pipeline = "Integrated"
)

switch ($Identity)
{
	0 {$FullIdentity = "LocalSystem"}
	1 {$FullIdentity = "LocalService"}
	2 {$FullIdentity = "NetworkService"}
	3 {$FullIdentity = "SpecificUser"}
	4 {$FullIdentity = "ApplicationPoolIdentity"}
}

function main(){

	Write-Host "deploy web application"

	if (LoadIIS7Module -eq $true) {
		Write-Verbose "Add a New IIS 7.0 Web Site..."
		Add-IIS7Website $SiteName $Port $HostName $Environment $Identity $Runtime $Pipeline
	} else {
		Write-Host "IIS7 WebAdministration Snapin or Module not found."
		Write-Host "Please consult the Microsoft documentation for installing the IIS7 PowerShell cmdlets"
	}
}

function Check-IfWebsiteExists($SiteName, $Environment){
	$SiteName += "-$Environment"
	if ((Test-Path -path "IIS:\Sites\$SiteName") -ne $false)
	{
		return $false
	}
	return $true
}

function LoadIIS7Module () {
	$ModuleName = "WebAdministration"
	$ModuleLoaded = $false
	$LoadAsSnapin = $false
	if ((Get-Module -ListAvailable | 
			ForEach-Object {$_.Name}) -contains $ModuleName) {
		Import-Module $ModuleName
		if ((Get-Module | ForEach-Object {$_.Name}) -contains $ModuleName) {
			$ModuleLoaded = $true
		} else {
			$LoadAsSnapin = $true
		}
	}
	elseif ((Get-Module | ForEach-Object {$_.Name}) -contains $ModuleName) {
		$ModuleLoaded = $true
	} else {
		$LoadAsSnapin = $true
	}
	if ($LoadAsSnapin) {
		if ((Get-PSSnapin -Registered | 
				ForEach-Object {$_.Name}) -contains $ModuleName) {
			Add-PSSnapin $ModuleName
			if ((Get-PSSnapin | ForEach-Object {$_.Name}) -contains $ModuleName) {
				$ModuleLoaded = $true
			}
		}
		elseif ((Get-PSSnapin | ForEach-Object {$_.Name}) -contains $ModuleName) {
			$ModuleLoaded = $true
		}
		else {
			$ModuleLoaded = $false
		}
	}
	return $ModuleLoaded
}

function Read-Choice {
	Param(
		[System.String]$Message,
		[Parameter(Mandatory=$true)]
		[ValidateNotNullOrEmpty()]
		[System.String[]]$Choices,
		[System.Int32]$DefaultChoice = 1,
		[System.String]$Title = [string]::Empty
	)
	[System.Management.Automation.Host.ChoiceDescription[]]$Poss = $Choices | ForEach-Object {
		New-Object System.Management.Automation.Host.ChoiceDescription "&$($_)", "Sets $_ as an answer."
	}
	$Host.UI.PromptForChoice($Title, $Message, $Poss, $DefaultChoice)
}

function Select-IPAddress {
	[cmdletbinding()]
	Param(
		[System.String]$ComputerName = 'localhost'
	)
	$IPs = Get-WmiObject -ComputerName $ComputerName -Class Win32_NetworkAdapterConfiguration -Filter "IPEnabled='True'" | ForEach-Object {
		$_.IPAddress
	} | Where-Object {
		$_ -match "^(([0-9]|[1-9][0-9]|1[0-9]{2}|2[0-4][0-9]|25[0-5])\.){3}([0-9]|[1-9][0-9]|1[0-9]{2}|2[0-4][0-9]|25[0-5])$"
	}

	if($IPs -is [array]){
		Write-Host "`nServer $ComputerName uses these IP addresses:"
		$IPs | ForEach-Object {$Id = 0} {Write-Host "${Id}: $_" -ForegroundColor Yellow; $Id++}
		$IPs[(Read-Choice -Message "`nChoose an IP Address" -Choices (0..($Id - 1)) -DefaultChoice 0)]
	}
	else{$IPs}
}

function Add-IIS7Website($SiteName, $Port, $HostName, $Environment, $Identity, $Runtime, $Pipeline)
{
	Write-Host "`n**********************************************************" -ForegroundColor Yellow
	Write-Host "*`t`tAutomatic Website Creation" -ForegroundColor Yellow
	Write-Host "*" -ForegroundColor Yellow
	Write-Host "*" -ForegroundColor Yellow -nonewline; Write-Host " Parameters"
	Write-Host "*" -ForegroundColor Yellow -nonewline; Write-Host " Website Name (-SiteName):`t`t" -nonewline; Write-Host "$SiteName" -ForegroundColor DarkGreen
	Write-Host "*" -ForegroundColor Yellow -nonewline; Write-Host " Website Port (-Port):`t`t`t" -nonewline; Write-Host "$Port" -ForegroundColor DarkGreen
	Write-Host "*" -ForegroundColor Yellow -nonewline; Write-Host " Website Hostname (-Hostname):`t`t" -nonewline; Write-Host "$HostName" -ForegroundColor DarkGreen
	Write-Host "*" -ForegroundColor Yellow -nonewline; Write-Host " Website Environment (-Environment):`t" -nonewline; Write-Host "$Environment" -ForegroundColor DarkGreen
	Write-Host "*" -ForegroundColor Yellow -nonewline; Write-Host " AppPool Identity (-Identity):`t`t" -nonewline; Write-Host "$FullIdentity ($Identity)" -ForegroundColor DarkGreen
	Write-Host "*" -ForegroundColor Yellow -nonewline; Write-Host " Managed Runtime (-Runtime):`t`t" -nonewline; Write-Host "v$Runtime" -ForegroundColor DarkGreen
	Write-Host "*" -ForegroundColor Yellow -nonewline; Write-Host " Managed Pipeline Mode (-Pipeline):`t" -nonewline; Write-Host "$Pipeline" -ForegroundColor DarkGreen
	Write-Host "*" -ForegroundColor Yellow
	Write-Host "**********************************************************" -ForegroundColor Yellow
	
	if ((Check-IfWebsiteExists $SiteName $Environment) -eq $false) {
		Write-Host "Website $SiteName already created!" -ForegroundColor Yellow
		return $false
	}

	if ($Identity -eq "3") {
		$AppPoolUser = Read-Host "`nPlease provide username for the ApplicationPool identity"
		$AppPoolPwd = Read-Host "Please provide the password for '$AppPoolUser' user" -AsSecureString
	}

	$ChosenIP = Select-IPAddress
	Write-Host "`nThe selected IP address is: $ChosenIP`n" -ForegroundColor DarkGreen

	$SiteName += "-$Environment"
	# Create the website directory
	Write-Host "Creating application directory" -ForegroundColor Yellow
	$WWWPath = "C:\inetpub\wwwroot"
	$SitePath = "$WWWPath" + "\" + "$SiteName"
	if (!(Test-Path $SitePath)) {
		New-Item -ItemType Directory -Path $SitePath
	}

	# Creates the website logfiles directory
	Write-Host "Creating application logfiles directory" -ForegroundColor Yellow
	$LogsPath = "C:\inetpub\logs\LogFiles"
	$SiteLogsPath = "$LogsPath" + "\" + "$SiteName"
	if (!(Test-Path $SiteLogsPath)) {
		New-Item -ItemType Directory -Path $SiteLogsPath
	}

	Import-Module "WebAdministration" -ErrorAction Stop
	if ($Pipeline -eq "Integrated") {$PipelineMode = "0"} else {$PipelineMode = "1"}

	# Creates the ApplicationPool
	Write-Host "Creating website application pool" -ForegroundColor Yellow
	New-WebAppPool –Name $SiteName -Force
	Set-ItemProperty ("IIS:\AppPools\" + $SiteName) -Name processModel.identityType -Value $Identity
	if ($Identity -eq "3") {
		Set-ItemProperty ("IIS:\AppPools\" + $SiteName) -Name processModel.username -Value $AppPoolUser
		Set-ItemProperty ("IIS:\AppPools\" + $SiteName) -Name processModel.password -Value $AppPoolPwd
	}
	Set-ItemProperty ("IIS:\AppPools\" + $SiteName) -Name managedRuntimeVersion -Value $Runtime
	Set-ItemProperty ("IIS:\AppPools\" + $SiteName) -Name managedPipelineMode -Value $PipelineMode

	# Creates the website
	Write-Host "Creating website" -ForegroundColor Yellow
	New-Website –Name $SiteName -Port $Port –HostHeader $HostName -IPAddress $ChosenIP -PhysicalPath $SitePath -ApplicationPool $SiteName -Force
	Set-ItemProperty ("IIS:\Sites\" + $SiteName) -Name logfile.directory -Value $SiteLogsPath

	Start-WebAppPool -Name $SiteName
	Start-WebSite $SiteName

	Write-Host "Website $SiteName created!" -ForegroundColor DarkGreen
}

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