start_azure_v2_vms.ps1

<#
    .SYNOPSIS
    Connects to Azure and stops of all VMs in the specified Azure subscription or resource group

    .DESCRIPTION
    This runbook connects to Azure and stops all VMs in an Azure subscription or resource group.  
    You can attach a schedule to this runbook to run it at a specific time. Note that this runbook does not stop
    Azure classic VMs. Use https://gallery.technet.microsoft.com/scriptcenter/Stop-Azure-Classic-VMs-7a4ae43e for that.

    REQUIRED AUTOMATION ASSETS
    1. An Automation variable asset called "AzureSubscriptionId" that contains the GUID for this Azure subscription.  
        To use an asset with a different name you can pass the asset name as a runbook input parameter or change the default value for the input parameter.
    2. An Automation credential asset called "AzureCredential" that contains the Azure AD user credential with authorization for this subscription. 
        To use an asset with a different name you can pass the asset name as a runbook input parameter or change the default value for the input parameter.

    PARAMETER AzureCredentialAssetName
    Optional with default of "AzureCredential".
    The name of an Automation credential asset that contains the Azure AD user credential with authorization for this subscription. 
    To use an asset with a different name you can pass the asset name as a runbook input parameter or change the default value for the input parameter.

    .PARAMETER AzureSubscriptionIdAssetName
    Optional with default of "AzureSubscriptionId".
    The name of An Automation variable asset that contains the GUID for this Azure subscription.
    To use an asset with a different name you can pass the asset name as a runbook input parameter or change the default value for the input parameter.

    .PARAMETER ResourceGroupName
    Optional
    Allows you to specify the resource group containing the VMs to stop.  
    If this parameter is included, only VMs in the specified resource group will be stopped, otherwise all VMs in the subscription will be stopped.  

    .NOTES
    Based on the original "Stop Azure V2 VMs" script by
    AUTHOR: System Center Automation Team 
    LASTEDIT: January 7, 2016
    #>

param (            
    [Parameter(Mandatory = $false)]
    [String] $AzureSubscriptionIdAssetName = 'AzureSubscriptionId',

    [Parameter(Mandatory = $false)] 
    [String] $ResourceGroupName
)

$connectionName = "AzureRunAsConnection"
try {
    # Get the connection "AzureRunAsConnection "
    $servicePrincipalConnection = Get-AutomationConnection -Name $connectionName         

    "Logging in to Azure..."
    Add-AzureRmAccount `
        -ServicePrincipal `
        -TenantId $servicePrincipalConnection.TenantId `
        -ApplicationId $servicePrincipalConnection.ApplicationId `
        -CertificateThumbprint $servicePrincipalConnection.CertificateThumbprint 
}
catch {
    if (!$servicePrincipalConnection) {
        $ErrorMessage = "Connection $connectionName not found."
        throw $ErrorMessage
    }
    else {
        Write-Error -Message $_.Exception
        throw $_.Exception
    }
}

Get-AzureRmVM -ResourceGroupName $ResourceGroupName

# Connect to Azure and select the subscription to work against
#$Cred = Get-AutomationPSCredential -Name $AzureCredentialAssetName -ErrorAction Stop
#$null = Add-AzureRmAccount -Credential $Cred -ErrorAction Stop -ErrorVariable err

if ($err) {
    throw $err
}

# If there is a specific resource group, then get all VMs in the resource group,
# otherwise get all VMs in the subscription.
if ($ResourceGroupName) { 
    $VMs = Get-AzureRmVM -ResourceGroupName $ResourceGroupName
}
else { 
    $VMs = Get-AzureRmVM
}

# Start each of the VMs
foreach ($VM in $VMs) {
    $VMDetail = $VM | Get-AzureRmVM -Status

    foreach ($VMStatus in $VMDetail.Statuses) { 
        if ($VMStatus.Code -like "PowerState/*") {
            $VMStatusDetail = $VMStatus.DisplayStatus
        }
    }

    Write-Output ("Current VM: " + $VM.Name);
    Write-Output ($VM.Name + " status is '" + $VMStatusDetail + "'");

    if ($VMStatusDetail -eq "VM Running") {
        Write-Output ("Not attempting to start " + $VM.Name + " as it's aleady running.")
    }
    else {
        Write-Output ("Attempting to start " + $VM.Name)

        $StartRtn = $VM | Start-AzureRmVM -ErrorAction Continue

        #   Write-Output ("Stop Status:")
        #   Write-Output ($StopRtn.StatusCode)

        if ($StartRtn.IsSuccessStatusCode -ne $True) {
            # The VM failed to start, so send notice
            Write-Output ($VM.Name + " failed to start")
            Write-Error ($VM.Name + " failed to start. Error was:") -ErrorAction Continue
            Write-Error ($StartRtn.ReasonPhrase) -ErrorAction Continue
        }
        else {
            # The VM started, so send notice
            Write-Output ($VM.Name + " has started.")
        }
    }
}