Problem using get-credential on a runbook

Question

Hi all,
I'm new on powershell scripting.
i need to do a script to start/stop/status windows service (ej Oracle Listener) after/previus poweron/poweroff a VM.
the script then i put on the runbook 
workflow MyStartAzureVM
    Param
        [Parameter(Mandatory=$true)]
        [String]
        $vmName,       
[Parameter(Mandatory=$true)]
        [String]
        $cloudServiceName 
    # Specify Azure Subscription Name
    $subName = 'Enterprise'   
    #please enter your own automation user here. See this blog for help: http://www.russellmccloy.com/2014/12/stop-azurevm-using-azure-automation.html
    $cred = Get-AutomationPSCredential -Name "admazure"
    Add-AzureAccount -Credential $cred
    Select-AzureSubscription -SubscriptionName $subName 
    $vm = Get-AzureVM -ServiceName $cloudServiceName -Name $vmName 
    Write-Output "$vm"
    Write-Output "vm.InstanceStatus"
    if ( $vm.InstanceStatus -eq 'StoppedDeallocated' ) {
        Start-AzureVM -ServiceName $vm.ServiceName -Name $vm.Name     
    #Verifico listener y si esta bajo lo subo.
    Write-Output "flag Antes del get-service"
 ###### in here a have the problem ###########   
    #$lst_status = Get-Service -PSComputerName SRVAZUCLK -name OracleOraDB12Home1TNSListenerLISTENER_WOMDB |select Status
    $lst_status = 'Stopped'
    Write-Output "$lst_status"
    ###### in here a have the problem ###########   
    if ( $lst_status -eq 'Stopped' ) {
    InlineScript {Invoke-Command -ComputerName SRVAZUCLK  {start-service -name OracleOraDB12Home1TNSListenerLISTENER_WOMDB}}
     Write-Output "flag despues del invoke"   
but i have this error.
1/29/2015 4:04:12 PM, Error: [SRVAZUCLK Connecting to remote server SRVAZUCLK failed with the following error message : The WinRM 
client cannot process the request. If the authentication scheme is different from Kerberos, or if the client computer 
is not joined to a domain, then HTTPS transport must be used or the destination machine must be added to the 
TrustedHosts configuration setting. Use winrm.cmd to configure TrustedHosts. Note that computers in the TrustedHosts 
list might not be authenticated. You can get more information about that by running the following command: winrm help 
config. For more information, see the about_Remote_Troubleshooting Help topic.
    + CategoryInfo          : OpenError: (SRVAZUCLK:String) [], PSRemotingTransportException
    + FullyQualifiedErrorId : ServerNotTrusted,PSSessionStateBroken
1/29/2015 4:04:12 PM, Output
i add the server to the trusted server but i'm steel geting this error.
on the VM SRVAZUCLK azure powershell console
PS C:\> Get-Item WSMan:\localhost\Client\TrustedHosts
   WSManConfig: Microsoft.WSMan.Management\WSMan::localhost\Client
Type            Name                           SourceOfValue   Value
System.String   TrustedHosts                                   *
PS C:\>
i tried to user the get-credencial, but in get-credential you most enter the password.
when a put get-credential into the runbook i get this error.
1/30/2015 10:33:03 AM, Error: Get-Credential : Cannot process command because of one or more missing mandatory parameters: Credential.
At MyStartAzureVM:45 char:45
+ 
    + CategoryInfo          : InvalidArgument: (:) [Get-Credential], ParameterBindingException
    + FullyQualifiedErrorId : MissingMandatoryParameter,Microsoft.PowerShell.Commands.GetCredentialCommand
1/30/2015 10:33:03 AM, Output
1/30/2015 10:33:03 AM, Error: Invoke-Command : Cannot process argument transformation on parameter 'Credential'. A command that prompts the user 
failed because the host program or the command type does not support user interaction. The host was attempting to 
request confirmation with the following message: Enter your credentials.
At MyStartAzureVM:49 char:49
+ 
    + CategoryInfo          : InvalidData: (:) [Invoke-Command], ParameterBindingArgumentTransformationException
    + FullyQualifiedErrorId : ParameterArgumentTransformationError,Microsoft.PowerShell.Commands.InvokeCommandCommand
1/30/2015 10:33:03 AM, Output
can i enter the password by parameter?? i cant find out how do that.
Thanks again.
Pablo

Answer 1

Hi Pablo,
You need to pass a credential to Invoke-Command, which you should store and retrieve from an Automation credential asset (use Get-AutomationPSCredential to retrieve it within a runbook), similar to what you are doing with credential asset "admazure."
See
https://technet.microsoft.com/en-us/library/dn919926.aspx for more details.
For a good sample on how to invoke a command on an Azure VM from Azure Automation, take a look at this runbook: https://gallery.technet.microsoft.com/scriptcenter/How-to-Use-a-PowerShell-59b2e28c.