Powershell：无法从主机读取和写入 Hyperv-V VM 上的变量

Question

我尝试使用此 Powershell 脚本在主机上写入和读取 VM 上的变量。

$Username = 'administrator'
$Password = 'password'
$pass = ConvertTo-SecureString -AsPlainText $Password -Force
$Cred = New-Object System.Management.Automation.PSCredential -ArgumentList $Username,$pass

#Added value to a variable on VM
Invoke-Command -VMName VM_Windows_2016 -Credential $Cred -ScriptBlock {$InstallPath="C:\Install\install-1.ps1"}
#Trying to read the variable on VM but with no result
Invoke-Command -VMName VM_Windows_2016 -Credential $Cred -ScriptBlock {Write-Host($InstallPath)}

如您所见，结果为空。谁能帮我展示如何从主机在 VM 上写入和读取变量？谢谢！

Answer 1

使用Invoke-Command to run a command remotely, any variables in the command are evaluated on the remote computer. So when you run the first Invoke-Command you are only defining the variable $InstallPath and terminating the remote PS session. When you are run the Invoke-Command second time it create entirely new PS session, hence InstallPath would be null. Instead of this you can define and read the variable in a single Cmdlet like this时。

$remoteScriptblock = {
$InstallPath = "C:\Install\install-1.ps1"
Write-Host($InstallPath)
}
Invoke-Command -VMName VM_Windows_2016 -Credential $Cred -ScriptBlock $remoteScriptblock

如果您仍想运行在多个 Cmdlet 中执行此操作，您可以考虑 Run a command in a persistent connection

Powershell：无法从主机读取和写入 Hyperv-V VM 上的变量

Powershell: Cannot read and write a variable on Hyperv-V VM from host

powershell

virtual

hyper-v