How do I recycle an IIS AppPool with Powershell?

Question

I haven't really done any Windows scripting at all, so I am at a loss on how to pull this one off. Anyway, basically what we want to do is have a script that will take an argument on which IIS AppPool to recycle. I have done some research on Google and haven't had much success on getting things to work.

Here is what I am trying now:

$appPoolName = $args[0] $appPool = get-wmiobject -namespace "root\MicrosoftIISv2" -class "IIsApplicationPools" Where-Object {$_.Name -eq "W3SVC/APPPOOLS/$appPoolName"} $appPool.Recycle() 

and the error I get:

Get-WmiObject : A parameter cannot be found that matches parameter name '$_.Name -eq "W3SVC/APPPOOLS/$appPoolName"'. 

Anyway, it would be nice if I also knew how to debug things like this. I already fixed one bug with the original script by doing gwmi -namespace "root\MicrosoftIISv2" -list. Any other tips like that one would be great.

Thanks!

Update: Here is some more info

$appPool = gwmi -namespace "root\MicrosoftIISv2" -class "IISApplicationPools" | Get-Member  .   TypeName: System.Management.ManagementObject#root\MicrosoftIISv2\IIsApplicationPools  Name                MemberType   Definition ----                ----------   ---------- Caption             Property     System.String Caption {get;set;} Description         Property     System.String Description {get;set;} InstallDate         Property     System.String InstallDate {get;set;} Name                Property     System.String Name {get;set;} Status              Property     System.String Status {get;set;} __CLASS             Property     System.String __CLASS {get;set;} __DERIVATION        Property     System.String[] __DERIVATION {get;set;} __DYNASTY           Property     System.String __DYNASTY {get;set;} __GENUS             Property     System.Int32 __GENUS {get;set;} __NAMESPACE         Property     System.String __NAMESPACE {get;set;} __PATH              Property     System.String __PATH {get;set;} __PROPERTY_COUNT    Property     System.Int32 __PROPERTY_COUNT {get;set;} __RELPATH           Property     System.String __RELPATH {get;set;} __SERVER            Property     System.String __SERVER {get;set;} __SUPERCLASS        Property     System.String __SUPERCLASS {get;set;} ConvertFromDateTime ScriptMethod System.Object ConvertFromDateTime(); ConvertToDateTime   ScriptMethod System.Object ConvertToDateTime(); Delete              ScriptMethod System.Object Delete(); GetType             ScriptMethod System.Object GetType(); Put                 ScriptMethod System.Object Put();   gwmi -namespace "root\MicrosoftIISv2" -class "IISApplicationPools"   __GENUS          : 2 __CLASS          : IIsApplicationPools __SUPERCLASS     : CIM_LogicalElement __DYNASTY        : CIM_ManagedSystemElement __RELPATH        : IIsApplicationPools.Name="W3SVC/AppPools" __PROPERTY_COUNT : 5 __DERIVATION     : {CIM_LogicalElement, CIM_ManagedSystemElement} __SERVER         : IRON __NAMESPACE      : root\MicrosoftIISv2 __PATH           : \\IRON\root\MicrosoftIISv2:IIsApplicationPools.Name="W3SVC/A                    ppPools" Caption          : Description      : InstallDate      : Name             : W3SVC/AppPools Status           : 

Answer 1

Where-Object is a filter that expects something as in input. There seems to be a missing pipe, before the where filter.

Try:

$appPoolName = $args[0] $appPool = get-wmiobject -namespace "root\MicrosoftIISv2" -class "IIsApplicationPool" | Where-Object {$_.Name -eq "W3SVC/APPPOOLS/$appPoolName"} $appPool.Recycle() 

Edit: I noticed that the WMI class was IISApplicationPools, which as you saw, did not show us the Recycle method when piped to Get-Member. This needs to be changed to IISApplicationPool (non-plural). With that change, you are able to use the Recycle method. The code above has been updated.

Answer 2

Using the data from this question I was able to create 2 very useful functions.

• Get-IisAppPools
• Recycle-IisAppPool

The code:

function Get-IisAppPools {      Get-WmiObject -Namespace "root\MicrosoftIISv2" -Class "IIsApplicationPool" -Filter 'name like "W3SVC/APPPOOLS/%"'           | ForEach-Object { $_.Name.ToString().SubString(15) }   }  function Recycle-IisAppPool([string]$appPoolName) {        Invoke-WmiMethod -Name Recycle -Namespace "root\MicrosoftIISv2" -Path "IIsApplicationPool.Name='W3SVC/APPPOOLS/$appPoolName'"   } 

You can use these functions like this

Recycle-IisAppPool DefaultAppPool Get-IisAppPools | ? { $_ -match "v4.0$" } | % { Recycle-IisAppPool $_ }