PowerShell 5.1
Invoke-Command -ScriptBlock {start-job {gsv}} -ComputerName Will
Invoke-Command -ScriptBlock {get-job} -ComputerName Will
Nothing was displayed. I couldn't retrieve any job.
Jobs are tied to the current session. The way you run Invoke-Command creates a new session with every invocation, so the second session naturally doesn't know anything about jobs of the first one.
Change your code to something like this, so both invocations run in the same session:
$session = New-PSSession -ComputerName Will
Invoke-Command -Session $session -ScriptBlock { Start-Job {gsv} }
Invoke-Command -Session $session -ScriptBlock { Get-Job }
Remove-PSSession $session
Related
I'm trying to run Invoke-Command within a PowerShell script to run scripts on remote servers. It retrieves the computer names and scripts to run from an XML file. Code sample is below. The script executes but nothing on the remote server is being run. I've tried 2 different ways to run Invoke-Command.
[string] $computer = "lumen"
[string] $scriptBlock = "cd C:\Scripts\Update-Apps; ./Update-Apps"
$session = New-PSSession -ComputerName $computer
Invoke-Command -Session $session -ScriptBlock { $scriptBlock }
#Invoke-Command -ComputerName $computer -ScriptBlock { $scriptBlock }
What am I doing wrong with Invoke-Command?
Thanks!
You are passing in a scriptblock with a string. When it will call it, it will basically have the same effect as writing $scriptBlock in your terminal. You have to actually execute the string in the scriptblock. You could use Invoke-Expression.
[string] $computer = "lumen"
[scriptblock] $scriptBlock = { "cd C:\Scripts\Update-Apps; ./Update-Apps" | Invoke-Expression }
$session = New-PSSession -ComputerName $computer
Invoke-Command -Session $session -ScriptBlock $scriptblock
Or you could write directly your command as PowerShell code in the scriptblock.
[string] $computer = "lumen"
[scriptblock] $scriptBlock = { cd C:\Scripts\Update-Apps; ./Update-Apps }
$session = New-PSSession -ComputerName $computer
Invoke-Command -Session $session -ScriptBlock $scriptblock
It doesn't have to be a string.
I am getting the below error, please advise how to fix this error for null-valued expression
You cannnot call a method on a null-valued expression
+CategoryInfo : InvalidOoperation: (:)[], RuntimeException
+FullyQualifiedErrorId: InvokeMethodonNull
+PSComputerName: DC1
Code below
function myfunction (){
$remoteserver = 'DC1'
$Session = New-PSSession -Computername $remoteserver -Credential $Cred
Import-Module ActiveDirectory
$local= $env:COMPUTERNAME
Invoke-Command -ComputerName $remoteserver -Credential $cred -ScriptBlock
{$using:local
if($local.substring(5,3) -imatch "Sys") {
Get-ADComputer $local | Move-ADObject -Targetpath "ou=PRD,ou=Servers,dc=com,dc=Companycorp,dc=net"}
}
} #end function
Invoke-Command -ComputerName $remoteserver -ScriptBlock ${Function:myFunction}
What you're looking for is the $using: scope. If you define variables that you want to use in your remote execution, you need to access them like:
$PC = $env:ComputerName
Invoke-Command -Computer DC01 -ScriptBlock { $using:PC <# logic #> }
If you mean you want to remote into DC01 to run commands against localhost, you're going to run into the second-hop problem due to Kerberos.
Update: Your new example looks pretty convoluted. Here's an example that should work:
$MyPC = $env:ComputerName
$Session = New-PSSession -Credential (Get-Credential) -ComputerName 'DC1'
Invoke-Command -Session $Session -ScriptBlock {
Import-Module -Name 'ActiveDirectory'
$PC = $using:MyPC
If ($PC.Substring(5,3) -eq 'sys')
{
Get-ADComputer -Identity $PC |
Move-ADObject -TargetPath 'ou=PRD,ou=Servers,dc=com,dc=Companycorp,dc=net'
}
}
What I think you're asking is 'how do I open a session on a remote pc, but then still run commands on my local PC'. If that's so, then let's walk through it.
First, we can open a remote connection to another computer in PowerShell by creating a new PSSession, as you're doing here:
$session = New-PSSession -Computername DC01 -Credential $cred
You can then either step into the remote computer wholly using Enter-PSSession, or just send individual commands to the remote computer using:
Invoke-Command -ScriptBlock {#Commands to run on the remote PC}`
-Session $session
Once you enter the remote PC, you can return to your own PC using the Exit-PSSession command.
#Enter Remote PC
Enter-PSSession $session
DC01> hostname
*DC01*
#Step out of Remote PC
Exit-PSSession
PS> hostname
*YOURPCNAME*
If this isn't what you want to do, let me know and we'll get you sorted.
You have to use Invoke-Command :
$session = New-PSSession -Computername DC01 -Credential $cred
Invoke-Command -Session $session -ScriptBlock {
$remoteComputerName = $env:computername
}
I have a script I'm trying to implement. If I run each line seperately, it works just fine. But if I place it in a function, or run with PowerGUI or Powershell ISE, it errors out. The problem is the script isn't changing the working directory, therefore the file that Invoke-Command is calling isn't found.
$DLUpdate = New-PSSession -ComputerName msmsgex10wprd03 -Credential $DLUpdateCred -Name DLUpdate
Enter-PSSession -Session $DLUpdate
$UpdateDLPath = 'c:\users\mascott2\Desktop\Distrolist\Updates\'
Set-Location $UpdateDLPath
Invoke-Command -ScriptBlock {cmd.exe "/c updatedls.bat"}
Exit-PSSession
Remove-PSSession -Name DLUpdate
You shouldn't be using Enter-PSSession in a script like that. Put all the commands you want into the scriptblock you use with Invoke-Command and run it against your session:
$DLUpdate = New-PSSession -ComputerName msmsgex10wprd03 -Credential $DLUpdateCred -Name DLUpdate
Invoke-Command -Session $DLUPdate -ScriptBlock {
$UpdateDLPath = 'c:\users\mascott2\Desktop\Distrolist\Updates\'
Set-Location $UpdateDLPath
cmd.exe "/c updatedls.bat"
}
Remove-PSSession -Name DLUpdate
I need to connect to some remote servers from a client (same domain as the servers) once connected, I need to run a batch file:
I've done so with this code:
$Username = 'USER'
$Password = 'PASSWORD'
$pass = ConvertTo-SecureString -AsPlainText $Password -Force
$Cred = New-Object System.Management.Automation.PSCredential -ArgumentList $Username,$pass
try {
Invoke-Command -ComputerName "SERVER1" -Credential $Cred -ScriptBlock -ErrorAction Stop {
Start-Process "C:\Users\nithi.sundar\Desktop\Test.bat"
}
} catch {
Write-Host "error"
}
This script does not give any errors, but it doesn't seem to be executing the batch script.
any input on this would be greatly appreciated.
Try replacing
invoke-command -computername "SERVER1" -credential $Cred -ScriptBlock -ErrorAction stop { Start-Process "C:\Users\nithi.sundar\Desktop\Test.bat" }
with
Invoke-Command -ComputerName "Server1" -credential $cred -ErrorAction Stop -ScriptBlock {Invoke-Expression -Command:"cmd.exe /c 'C:\Users\nithi.sund
ar\Desktop\Test.bat'"}
It's not possible that the code you posted ran without errors, because you messed up the order of the argument to Invoke-Command. This:
Invoke-Command ... -ScriptBlock -ErrorAction Stop { ... }
should actually look like this:
Invoke-Command ... -ErrorAction Stop -ScriptBlock { ... }
Also, DO NOT use Invoke-Expression for this. It's practically always the wrong tool for whatever you need to accomplish. You also don't need Start-Process since PowerShell can run batch scripts directly:
Invoke-Command -ComputerName "SERVER1" -ScriptBlock {
C:\Users\nithi.sundar\Desktop\Test.bat
} -Credential $Cred -ErrorAction Stop
If the command is a string rather than a bare word you need to use the call operator, though:
Invoke-Command -ComputerName "SERVER1" -ScriptBlock {
& "C:\Users\nithi.sundar\Desktop\Test.bat"
} -Credential $Cred -ErrorAction Stop
You could also invoke the batch file with cmd.exe:
Invoke-Command -ComputerName "SERVER1" -ScriptBlock {
cmd /c "C:\Users\nithi.sundar\Desktop\Test.bat"
} -Credential $Cred -ErrorAction Stop
If for some reason you must use Start-Process you should add the parameters -NoNewWindow and -Wait.
Invoke-Command -ComputerName "SERVER1" -ScriptBlock {
Start-Process 'C:\Users\nithi.sundar\Desktop\Test.bat' -NoNewWindow -Wait
} -Credential $Cred -ErrorAction Stop
By default Start-Process runs the invoked process asynchronously (i.e. the call returns immediately) and in a separate window. That is most likely the reason why your code didn't work as intended.
I am trying to run a script block on a remote machine, but i don't to be prompted for credentials, i want to pass them in the script.
Some commands may but the commands i want to run are access denied unless i provide the credential.
for example this command can work:
Invoke-Command -Session $session -ErrorAction Stop -ErrorVariable $Error -Scriptblock {ls }
but this wont work unless -credential is passed (Invoke-Command on target)
Invoke-Command -Session $session -ErrorAction Stop -ErrorVariable $Error -Scriptblock {Invoke-Command -computername $Env:COMPUTERNAME -Credential $Cred -ScriptBlock {ls} }
the same way what i want to achieve causes access denied problem (starting a process)
Invoke-Command -Session $session -ErrorAction Stop -ErrorVariable $Error -Scriptblock {[System.Diagnostics.Process]::Start("C:\Myprocess.exe", $localArgs, "UserName", $credential.Password, "MyDomain")}
Invoke-Command -Session $session -ErrorAction Stop -ErrorVariable $setError -Scriptblock {$Domain = "domain";$PassSec = ConvertTo-SecureString $( "password") -AsPlainText -Force ; $Cred = New-Object -TypeName System.Management.Automation.PSCredential -argumentlist $($domain + "\" + "userName"),$passSec; Invoke-Command -computername $Env:COMPUTERNAME -Credential $Cred -ScriptBlock {C:\Myprocess.exe } }