Bootstrap IIS with PowerShell

bootstrap.ps1

Set-ExecutionPolicy RemoteSigned
Import-Module WebAdministration

Function bootstrap($siteName, $hostHeader, $sitePath, $pipelineMode)
{
    $site = Get-WebSite | where { $_.Name -eq $siteName }
    if($site -eq $null)
    {
        echo "Creating site: $siteName"

        $appPool = New-WebAppPool -Name $siteName -Force
        $appPool | Set-ItemProperty -Name "managedPipelineMode" -Value $pipelineMode
       
        $absoluteSitePath = Resolve-Path $sitePath
        New-Website -Name $siteName -Port 80 -PhysicalPath $absoluteSitePath 
            -ApplicationPool $siteName -HostHeader $hostHeader
    
        "127.0.0.1" + "`t`t" + $hostHeader | Out-File -encoding ASCII
            -append "C:\Windows\System32\drivers\etc\hosts"
    }
}

bootstrap "Site1" "site1.dev" "Solution\Site1" Integrated
bootstrap "Site2" "site2.dev" "Solution\Site2" Classic

More here: http://blog.antrob.us/bootstrapping-iis-with-powershell/