Remoting with PowerShell QuickStart

Remoting with PowerShell QuickStart

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PowerShell V2 introduces a new capability which allows you to remotely manage machines in your organization. I will give a basic overview of PowerShell remoting here and follow it up with some adavanced topics later. Are you ready for the fun..

A remote interaction involves 2 endpoints – Client and a Server. The same computer or system can act both as a client and as a server.

Configuration

To enable an endpoint for PowerShell remoting you need to do the following:

Step 1: Install PowerShell CTP2 of PowerShell V2

Step2: Install CTP of WinRM

Step 3: Configure WinRM for PowerShell remoting. This can be done from a PowerShell Console using the following steps

(a)    Open PowerShell console in elevated prompt

(b)   Run $pshome\configure-wsman.ps1 script.

The above script will prepare your machine for remoting. This script will enable an endpoint both to act as a client and as well as a server.

PowerShell depends on WinRM for transport of data between endpoints. WinRM implements WS-Management a SOAP-based protocol for the management of servers etc. The good thing about this protocol is it is based on HTTP. So all the packets are going on Port 80 (by default) and you don’t need to open any other port for PowerShell remoting.

Using the Power

The beauty of PowerShell remoting is that all the cmdlets/scripts you have from V1 work as is everywhere (as long as PowerShell is installed on the server). So you develop your cmdlet/scripts once and you can remotely execute them with PowerShell as is without making any changes. The only dependency being the cmdlet/script you want to execute should be accessible on the remote box.

Let me show you some examples:

PS C:\> #my current machine

PS C:\> $env:computername

KRISCV-JHOOM

PS C:\> icm kriscv-lh { $env:computername }

KRISCV-LH

PS C:\>

The above example gives a glimpse of powershell remoting. Here I ran “$env:computername” locally and then on a remote machine from my local machine. I showed a new command “icm” here. “icm” is an alias for invoke-command cmdlet. This cmdlet takes the following pattern:

 

Invoke-command <ExecutionContext>  { <script block to run in the context>}

 

In my above “kriscv-lh” is the execution context. In this case it is a destination computer name.  So, essentially I have asked invoke-command to run the script “{$env:computername}” on the remote machine. This is the cmdlet you should use for remoting in CTP2 of Powershell V2. This cmdlet internally creates a connection with the machine “kriscv-lh”, runs the command on the machine, gets the output from the remote machine to the local machine, displays the output and then closes the connection.

 

You can pretty much do anything on the remote machine as you would on the local machine. Administrator of the remote machine however has the complete control of restricting you.

 

The following example shows you a way of finding free disk space on the remote machine:

 

PS C:\> $env:computername

KRISCV-JHOOM

PS C:\> icm kriscv-lh {gwmi win32_logicaldisk | select deviceid,freespace}

 

deviceid                 freespace                ComputerName             RunspaceId

--------                          ---------                ------------                           ----------

A:                                                               kriscv-lh                         8ce689c2-87a2-4e38-83...

C:                       44054937600                 kriscv-lh                          8ce689c2-87a2-4e38-83...

D:                                                              kriscv-lh                          8ce689c2-87a2-4e38-83...

 

Estentially whatever you have learned with V1 of PowerShell can be used with PowerShell remoting.  Lets convert the above example to show the freespace in GB instead of bytes:

 

PS C:\> icm kriscv-lh {gwmi win32_logicaldisk | select deviceid,freespace} | select deviceid,@{Name=

"freespace(GB)";Expression={$_.freespace/1gb}},computername

 

deviceid                                             freespace(GB)           ComputerName

--------                                                     -------------                 ------------

A:                                                                               0               kriscv-lh

C:                                                   41.0060882568359              kriscv-lh

D:                                                                               0               kriscv-lh

 

Notice what I have done here. The command in bold above is run on the remote machine kriscv-lh and the rest of the pipeline is run on the local box ie.,”select-object” cmdlet is run on the local machine. PowerShell remoting ensures objects are written onto the pipeline and hence you can leverage the complete power of PowerShell by working directly with an object.

 

You can apply the same concept to multiple machines. The following examples gets the free disk space from multiple machines:

 

PS C:\> icm kriscv-lh,kriscv-jhoom {gwmi win32_logicaldisk | select deviceid,freespace} | select dev

iceid,@{Name="freespace(GB)";Expression={$_.freespace/1gb}},computername

 

deviceid                                             freespace(GB)       ComputerName

--------                                                      -------------                  ------------

C:                                                182.064617156982       kriscv-jhoom

D:                                                136.152328491211      kriscv-jhoom

E:                                                7.60776519775391       kriscv-jhoom

F:                                                1.76084136962891       kriscv-jhoom

G:                                                                           0        kriscv-jhoom

A:                                                                           0        kriscv-lh

C:                                               41.0063934326172       kriscv-lh

D:                                                                           0        kriscv-lh

 

Notice I am running the command on 2 machines and running select-object cmdlet on the local box to filter the data.

 

There are so many things I want to talk about this CTP which I will do in the coming weeks. For the time being install the CTP, try out our new features and most importantly, if possible, give us your feedback.

 

Have a great weekend!!

 

Thanks

Krishna Vutukuri[MSFT]

Windows PowerShell Development

This posting is provided “AS IS” with no warranties.

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  • I noticed WinRM is out for WinXP, but I imagine that doesn't necessarily mean that PS2 CTP2 now magically supports remoting.  I actually get pretty far w/the WS-management script, except I get this one error:

    CheckError : Configuring PowerShell plugin failed

    At C:\WINDOWS\system32\WindowsPowerShell\v1.0\\wsmanutils.ps1:155 char:16

    +      CheckError <<<<  "Configuring PowerShell plugin failed"

    Note v2.0 is installed, it's just in the v1.0 directory

  • I noticed WinRM is out for WinXP, but I imagine that doesn't necessarily mean that PS2 CTP2 now magically supports remoting.  I actually get pretty far w/the WS-management script, except I get this one error:

    CheckError : Configuring PowerShell plugin failed

    At C:\WINDOWS\system32\WindowsPowerShell\v1.0\\wsmanutils.ps1:155 char:16

    +      CheckError <<<<  "Configuring PowerShell plugin failed"

    Note v2.0 is installed, it's just in the v1.0 directory

  • You need to install the CTP of WSMan 2.0, but they are currently supported on Vista-SP1 and WS08 only.

  • Hi - I'm really having a lot of trouble understanding/confirming the exact system requirements needed to use PS remoting. I've looked around quite a bit on various blog sites - most everyone else seems to be able to run remoting commands with no issue.

    My problem is that I am running both WS2008 and Win7, with the versions of PS 2 installed via the base OS install, and I am unable to use any remoting commands. I have done "winrm quickconfig" and the "configure-wsman1" scripts but no PS command seems to want to admit to knowing anything about remoting, they all give me errors saying that they do not know anything about '-computername', etc. The below output is from my WS2008 machine.

    Is there a document or site somewhere that specifies *EXACTLY* what versions of the OS and PS you need to do remoting, and *EXACTLY* what steps need to be taken to set it up?

    Many thanks

    PS C:\Windows\System32\WindowsPowerShell\v1.0> $host.version

    Major  Minor  Build  Revision

    -----  -----  -----  --------

    2      0      -1     -1

    PS C:\Windows\System32\WindowsPowerShell\v1.0> $psversiontable

    Name                           Value

    ----                           -----

    CLRVersion                     2.0.50727.3506

    BuildVersion                   6.1.6936.0

    PSVersion                      2.0

    PSCompatibleVersions           {1.0, 2.0}

    PS C:\Windows\System32\WindowsPowerShell\v1.0> winrm id

    IdentifyResponse

       ProtocolVersion = http://schemas.dmtf.org/wbem/wsman/1/wsman.xsd

       ProductVendor = Microsoft Corporation

       ProductVersion = OS: 6.1.6936 SP: 0.0 Stack: 2.0

    PS C:\Windows\System32\WindowsPowerShell\v1.0> invoke-expression -computername foo

    Invoke-Expression : A parameter cannot be found that matches parameter name 'computername'.

    At line:1 char:32

    PS C:\Windows\System32\WindowsPowerShell\v1.0> new-runspace

    The term 'new-runspace' is not recognized as a cmdlet, function, operable program, or script file. Verify the term and try again.

  • Hmm. Looks like I stumped the panel. Can anyone at least recommend another site where I can try reposting?

  • Sea Tea Pea Three Whee! Go get it ! The bits in the overview I want to call out (because I've seen others

  • Please help - similar problem to somebody above.

    I'll give as much detail as possible.  I have upgraded to vista home professional & am trying to get powershell 2 to run background jobs. But I just can not do it.

    I am first trying to get CTP2 working as if you jump straight to CTP3 you do not have the configure-Wsman.ps1 script !

    Anyway - I've installed WinRM CTP3 on vista (x86) & powershell.  I've tried all the suggestions to change the registry(DWORD stuff), stop UAD etc.  I have even restored the "hidden" administrator id.  But still, when trying to configure winRM I get ....

    PS C:\Users\Administrator> get-service winrm

    Status   Name               DisplayName

    ------   ----               -----------

    Stopped  WinRM              Windows Remote Management (WS-Manag...

    PS C:\Users\Administrator> start-service winrm

    PS C:\Users\Administrator> & $pshome\Configure-Wsman.ps1

    Configuring WSMan

    WSManFault

       Message = Access is denied.

    Error number:  -2147024891 0x80070005

    Access is denied.

    Error restoring default WSMan configuration. Exiting

    PS C:\Users\Administrator>

    Please can somebody help

    Cheers

    Will

  • @Will

    Basically you need to check three things:

    1. PowerShell console runs elevated.

    2. Password of your administrator account is not empty.

    3. Local account token filter policy is enabled:

    new-itemproperty -path HKLM:\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System -name LocalAccountTokenFilterPolicy -propertyType DWord -value 1

    Also, in CTP3 you need to use Enable-PSRemoting command for remoting configuration. Configure-WSMan script is deprecated.

    Hope this helps,

    Vladimir Averkin

    Windows PowerShell team

  • Any chance we could get these old posts updated AT THE TOP with something like [[THIS WAS A CTP POST -- IT'S PROBABLY WRONG NOW]] so that people don't have to come all the way to the bottom (or into IRC or USENET) to figure out why configure-wsman.ps1 doesn't work anymore?

  • Question about how to import modules on a remote server. I'm trying to remotely stop an IIS website with the following command but it doesnt seem to work (although it doesnt report an error either).

    powershell -command "icm hydrogen {import-module webadministration | stop-webitem iis:\sites\mysite}"

    Any thought on why this doesnt work?

    CT

  • Installed powershell 2 with winrm using windows core manageability pack. Winrm gives the following error:

    WSManFault

      Message = Access is denied.

    Error number:  -2147024891 0x80070005

    When I install the WS-Man 1.1 package without powershell winrm works fine. Unfortunately winrm only packages are not available for Vista/Windows 7.

    I am running on elevated priviledges in an admin account. I have this problem in XP, Vista and Windows 7.

    I read through your blog about configure-wsman.ps1 but the script is not available in RTM relase.

    Any ideas on how to fix this problem?

  • I am attepting to write some C# code, but when I compile I am getting the error that System.Management.Automation.dll doesn't contain

    "System.Management.Automation.Remoting"

    Is this a separate DLL?  If so, where can I get it?  I have installed WinRM 2.0 and PS 2.0 on 2k8.

    Thanks.

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