PowerShell – Start / Stop IIS Website and Application Pool

clear
 
Function Load-WebAdmin
    {
        $webAdminModule = get-module -ListAvailable  | ? { $_.Name -eq "webadministration" }
        If ($webAdminModule -ne $null)
            {
                import-module WebAdministration
            }
    }

# Variables - Start 
$siteName = $args[0] # "default web site"
$appPoolName = $args[1] # "DefaultAppPool"
$action = $args[2] # 1 for stop, 0 for start
$runscript = 1
# Variables - Stop

# Check Parameter Input - Start
if($siteName -eq $null)
    {
        write-host "Error: Site Name, Argument is missing"
        $runscript = 0
    }
if($appPoolName -eq $null)
    {
        write-host "Error: App Pool Name, Argument is missing"
        $runscript = 0
    }
if($action -eq $null)
    {
        write-host "Error: Action, Argument is missing"
        $runscript = 0
    }
# Check Parameter Input - Stop
 
# If appName was not passed show instructions
if (!($runscript -eq 1))
    {
        write-host "`nMissing Parameters"
        write-host "`n .\IIS-Stop.ps1 <Site Name> <App Pool Name> <Action>`n"
    }
else
    {
        if (Test-Path "IIS:\Sites\$siteName")
            {
                if ($action -eq 1)
                    {
                        
                        if ((Get-WebsiteState -Name $siteName).Value -ne "Stopped")
                            {
                                stop-website -Name $siteName
                                echo "Stopped website '$siteName'"
                            }
                        else
                            {
                                echo "WARNING: Site '$siteName' was already stopped."
                            }
                    }
                else
                    {
                        if ((Get-WebsiteState -Name $siteName).Value -ne "Started")
                            {
                                start-website -Name $siteName
                                echo "Started website '$siteName'"
                            }
                        else
                            {
                                echo "WARNING: Site '$siteName' was already started."
                            }
                    }
            }
        else
            {
                echo "WARNING: Could not find a site called '$siteName' to stop. Assuming this is a new install"
            }
       
        if (Test-Path "IIS:\AppPools\$appPoolName")
            {
                if ($action -eq 1)
                    {
                        if ((Get-WebAppPoolState -Name $appPoolName).Value -ne "Stopped")
                            {
                                Stop-WebAppPool -Name $appPoolName
                                echo "Stopped AppPool '$appPoolName'"
                            }
                        else
                            {
                                echo "WARNING: Site '$appPoolName' was already stopped."
                            }
                    }
                else
                    {
                        if ((Get-WebAppPoolState -Name $appPoolName).Value -ne "Started")
                            {                                
                                start-WebAppPool -Name $appPoolName
                                echo "Started AppPool '$appPoolName'"
                            }
                        else
                            {
                                echo "WARNING: AppPool '$appPoolName' was already started."
                            }
                    }
            }
        else
            {
                echo "WARNING: Could not find an AppPool called '$appPoolName' to stop. Assuming this is a new install"
            }
    }

Reference: https://github.com/alastairtree/deploy-websites-with-powershell