Resize Azure VMs using Az powershell.

Script to resize Azure VM's from any subscription. If a VM is stopped it will resize it. If it is running it will stop the VM and resize it.

#$NewSize = "Standard_D8s_v3"

$NewSize = "Standard_E4s_v3" 

#$NewSize = "Standard_DS1_v2"

Function Out($message) {

$message = $(Get-Date -Format "MM/dd/yyyyTHH:mm:ss") + ":" + $message

Write-Output $message}

Out "Vm resize script starting...."

function Connect($tenantid)

{

$username = "username@contoso.com"

$password = ConvertTo-SecureString -AsPlainText -Force "password" 

$pscredential = New-Object -TypeName System.Management.Automation.PSCredential($username, $password)

Connect-AzAccount -Credential $pscredential -Tenant $tenantId -EnvironmentName AzureUSGovernment

}

Function Resize-VM($VM)

{

 

  Out "Resizing $($vm.name) in $($vm.ResourceGroupName) from $($VM.HardwareProfile.VmSize) to $NewSize"          ## Change here

   $VM.HardwareProfile.VmSize = $NewSize

  Update-AzVM -ResourceGroupName $vm.ResourceGroupName -VM $VM 

}

Function CheckVM($VM)

{            

   if((Get-AzVM -Name $VM.Name -Status).PowerState -eq "VM running")

     {

       Out "$($VM.Name) is resized and Started"

     }

     else {

         Out "$($VM.Name) is resized and not started"

      }

     

}

Connect "put your tenant id here"

$VMList = @("VM1","VM2" ## comma separated list of VM's

)

$Allsubs = Get-AzSubscription 

foreach($sub in $Allsubs)

{

   Select-AzSubscription -SubscriptionId $sub.SubscriptionId | Out-Null

  $VMS = Get-AzVM -Status 

 

foreach($vm in $VMS)

{

 

 foreach($v in $VMList)

   {

     if($v -eq $Vm.name)

      {

        

      if($vm.PowerState -notmatch "VM running") ## If the VM is switched off.We resize but dont start it.

        {

          #Resize the vm

          Out "VM $($VM.Name) is already powered off.Resizing...."

          Resize-VM $VM

          

        }

     Else # If the VM is turned on. Turn it off, resize and start it.

        {

          Out "VM is powered on. So Stopping $($VM.Name)"

          Stop-AzVM -Name $vm.Name -ResourceGroupName $vm.ResourceGroupName -Force

          Start-Sleep -Seconds 120

          #Get VM Status

          if((Get-AzVM -Name $VM.Name -Status).PowerState -eq "VM deallocated")

             {

               Out "$($VM.Name) is now off. Resizing...."

               Resize-VM $VM

               Start-AzVM -Name $VM.Name -ResourceGroupName $VM.ResourceGroupName

               Start-Sleep -Seconds 300

               CheckVM $VM

         }

                 

      }

   }

}

}

}