powershell - Check whether IIS is installed or not

Powershell - Check whether IIS is installed or not

In PowerShell, you can check whether IIS (Internet Information Services) is installed on a Windows system using various methods. Here are a few approaches:

Using Get-WindowsFeature

  1. Check IIS Installation Status:

    # Check if IIS Web Server (Web-Server) feature is installed $isIISInstalled = Get-WindowsFeature -Name Web-Server | Where-Object {$_.Installed} if ($isIISInstalled) { Write-Output "IIS is installed." } else { Write-Output "IIS is not installed." }
    • This script uses Get-WindowsFeature cmdlet to retrieve information about Windows features.
    • It checks if the Web-Server feature, which corresponds to IIS, is installed (Installed property is true).

  2. Alternative Method with Get-Service:

    # Check if World Wide Web Publishing Service (W3SVC) is running $isIISRunning = Get-Service -Name W3SVC -ErrorAction SilentlyContinue if ($isIISRunning) { Write-Output "IIS is installed and running." } else { Write-Output "IIS is not installed or not running." }
    • This checks if the W3SVC service (World Wide Web Publishing Service) is running, indicating that IIS is installed and operational.

Notes:

  • Permissions: Ensure you have sufficient permissions to execute these commands, especially when querying system-wide information.

  • Error Handling: PowerShell commands might generate errors if features or services are inaccessible or if the feature/service names differ based on Windows version or configuration.

These methods provide reliable ways to determine whether IIS is installed and running on a Windows system using PowerShell, helping you verify the environment before performing tasks dependent on IIS functionality.

Examples

  1. Check if IIS is installed on a local machine

    • Description: PowerShell script to determine if Internet Information Services (IIS) is installed locally.
    • Code:
      $iisInstalled = Get-WindowsFeature -Name Web-Server if ($iisInstalled -eq $null) { Write-Output "IIS is not installed." } else { Write-Output "IIS is installed." }
    • Explanation: Uses Get-WindowsFeature cmdlet to check for the presence of the Web-Server feature, indicating whether IIS is installed on the local machine.

  2. Verify IIS installation status on a remote computer

    • Description: PowerShell script to remotely check if IIS is installed on a target machine.
    • Code:
      $computerName = "RemoteComputer" $session = New-PSSession -ComputerName $computerName $iisInstalled = Invoke-Command -Session $session -ScriptBlock { Get-WindowsFeature -Name Web-Server } Remove-PSSession -Session $session if ($iisInstalled -eq $null) { Write-Output "IIS is not installed on $computerName." } else { Write-Output "IIS is installed on $computerName." }
    • Explanation: Establishes a PowerShell session (New-PSSession) on a remote computer, checks if Web-Server feature is installed using Invoke-Command, and confirms IIS installation status.

  3. List all IIS-related services

    • Description: PowerShell script to list all IIS-related services installed on the local machine.
    • Code:
      Get-WindowsFeature Web-*
    • Explanation: Uses wildcard (*) with Get-WindowsFeature to list all features related to IIS (e.g., Web-Server, Web-ASP, Web-CGI, etc.) installed on the local machine.

  4. Check IIS version and details

    • Description: PowerShell script to retrieve detailed information about the installed version of IIS.
    • Code:
      Get-ItemProperty HKLM:\SOFTWARE\Microsoft\InetStp\ | Select-Object SetupString
    • Explanation: Retrieves the installation details and version information of IIS from the registry key HKLM:\SOFTWARE\Microsoft\InetStp\.

  5. Detect IIS installation using service check

    • Description: PowerShell script to detect IIS installation by checking for related services.
    • Code:
      $services = Get-Service -Name W3SVC -ErrorAction SilentlyContinue if ($services -ne $null) { Write-Output "IIS is installed." } else { Write-Output "IIS is not installed." }
    • Explanation: Checks if the W3SVC (World Wide Web Publishing Service) is present using Get-Service, indicating whether IIS is installed.

  6. Query IIS installation status on multiple servers

    • Description: PowerShell script to query and display IIS installation status on multiple remote servers.
    • Code:
      $servers = "Server1", "Server2", "Server3" foreach ($server in $servers) { $iisInstalled = Invoke-Command -ComputerName $server -ScriptBlock { Get-WindowsFeature -Name Web-Server } if ($iisInstalled -eq $null) { Write-Output "IIS is not installed on $server." } else { Write-Output "IIS is installed on $server." } }
    • Explanation: Iterates through a list of remote servers ($servers), checks for IIS installation on each using Invoke-Command, and outputs the results accordingly.

  7. Detect IIS using installed module check

    • Description: PowerShell script to detect IIS installation by verifying the presence of related modules.
    • Code:
      $iisModules = Get-Module -ListAvailable | Where-Object { $_.Name -like "WebAdministration" } if ($iisModules -ne $null) { Write-Output "IIS is installed." } else { Write-Output "IIS is not installed." }
    • Explanation: Uses Get-Module to check for the presence of the WebAdministration module, typically indicating the installation of IIS.

  8. Check IIS feature installation status

    • Description: PowerShell script to check the installation status of specific IIS features.
    • Code:
      Get-WindowsFeature -Name Web-Server, Web-Mgmt-Console
    • Explanation: Queries the installation status of specific IIS features (Web-Server and Web-Mgmt-Console) using Get-WindowsFeature.

  9. Detect IIS installation using web.config presence

    • Description: PowerShell script to detect IIS installation by checking for the presence of a web.config file.
    • Code:
      $webConfigPath = "C:\inetpub\wwwroot\web.config" if (Test-Path $webConfigPath) { Write-Output "IIS is installed." } else { Write-Output "IIS is not installed." }
    • Explanation: Checks if a web.config file exists in the default IIS web root (C:\inetpub\wwwroot), indicating an IIS installation.

  10. Check IIS installation using registry check

    • Description: PowerShell script to detect IIS installation by checking a specific registry key.
    • Code:
      $registryPath = "HKLM:\SOFTWARE\Microsoft\InetStp" if (Test-Path $registryPath) { Write-Output "IIS is installed." } else { Write-Output "IIS is not installed." }
    • Explanation: Uses Test-Path to check for the existence of the HKLM:\SOFTWARE\Microsoft\InetStp registry key, confirming an IIS installation.

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