PowerShell 脚本中的“会话”参数为空或为空

Question

我对 PowerShell 非常陌生（请原谅我的无知），我正在尝试在我的域中的多台计算机上远程安装程序。目前，我只是想让它在一台计算机上工作。下面的脚本是在网上找到的，适合我的需要。昨天它工作，但今天它抱怨会话参数。

我不完全理解“会话”，但我已确保客户端计算机上的 winrm 服务正在运行，并且我已调用 Enable-PSRemoting -force。

这是脚本：

$computers = Get-Content "c:\tmpPS\computers.txt"
$rs = Get-PSSession
Get-PSSession | Get-Member
######
## Functions
################

foreach ($comp in $computers)
{
    Write-Host "should work with $comp"
}

PushMSI
RemoteConnect
InstallMSI

Function PushMSI {
 Write-Host "------------------------------------------------"
 Write-Host "This will copy the MSI file from localhost c:\tmpPS\"
 write-Host "------------------------------------------------"
 Write-Host ""
 Write-Host ""
 foreach ($comp in $computers)
{
   Copy-Item -path "c:\tmpPS\clientInstall.msi" -Destination \\$comp\c$\tmpPS

}
}

Function RemoteConnect
{
 Write-Host "------------------------------------------------"
 Write-Host "This will establish a PSSession with all computers in c:\temp\computers.txt"
 write-Host "------------------------------------------------"
 Write-Host ""
 Write-Host ""
Get-Content C:\tmpPS\computers.txt | New-PSSession -ThrottleLimit 50
}

Function InstallMSI
{
 Write-Host "------------------------------------------------"
 Write-Host "This will Install UPS Update on all computers with an Established PSSession"
 write-Host "------------------------------------------------"
 Write-Host "After the Install PSSessions will be removed"
 Write-Host ""

Invoke-Command -Session $rs -ScriptBlock {invoke-item "c:\tmpPS\ClientInstall.msi"}
}

Get-PSSession | Remove-PSSession

这是输出：

PS C:\Users\Me> C:\tmpPS\remoteInstall.ps1
Get-Member : No object has been specified to the get-member cmdlet.
At C:\tmpPS\remoteInstall.ps1:3 char:17
+ Get-PSSession | Get-Member
+                 ~~~~~~~~~~
    + CategoryInfo          : CloseError: (:) [Get-Member], InvalidOperationException
    + FullyQualifiedErrorId : NoObjectInGetMember,Microsoft.PowerShell.Commands.GetMemberCommand

should work with eSignWin81.informa.local
------------------------------------------------
This will copy the MSI file from localhost c:\tmpPS\
------------------------------------------------


------------------------------------------------
This will establish a PSSession with all computers in c:\temp\computers.txt
------------------------------------------------



 Id Name            ComputerName    State         ConfigurationName     Availability
 -- ----            ------------    -----         -----------------     ------------
  6 Session6        eSignWin81.i... Opened        Microsoft.PowerShell     Available
------------------------------------------------
This will Install UPS Update on all computers with an Established PSSession
------------------------------------------------
After the Install PSSessions will be removed

Invoke-Command : Cannot validate argument on parameter 'Session'. The argument is null or empty. Supply an argument that is not null or empty and then try 
the command again.
At C:\tmpPS\remoteInstall.ps1:49 char:25
+ Invoke-Command -Session $rs -ScriptBlock {invoke-item "c:\tmpPS\ClientInstall.ms ...
+                         ~~~
    + CategoryInfo          : InvalidData: (:) [Invoke-Command], ParameterBindingValidationException
    + FullyQualifiedErrorId : ParameterArgumentValidationError,Microsoft.PowerShell.Commands.InvokeCommandCommand

Answer 1

尽量不要使用Write-Host，因为它会破坏管道并杀死小狗。

我已尝试稍微改进您的脚本，以便您更好地理解结构背后的逻辑。它尚未经过测试，但应该可以解决问题。

# First parameters
[CmdletBinding()]
Param(
    [ValidateScript({Test-Path $_ -PathType leaf})]
    $ComputerList = "c:\tmpPS\computers.txt",
    [ValidateScript({Test-Path $_ -PathType leaf})]
    $MSI = "c:\tmpPS\clientInstall.msi"
)

# Then functions
Begin {
    Function Copy-MSI {
         foreach ($Com in $Computers) {
           Copy-Item -path $MSI -Destination "\\$Com\c$\tmpPS"
        }
    }

    Function Install-MSI {
         foreach ($Com in $Computers) {
            Enter-PSSession -ComputerName $Com
            invoke-item "c:\tmpPS\ClientInstall.msi"
            Exit-PSSession
        }
    }
}

# Then the actions
Process {
    $Computers = Get-Content $ComputerList
    Copy-MSI
    Install-MSI
}

如果你运行这个，你会找到你正在寻找的信息：

Get-Help Enter-PSSession