Microsoft Azure – Resizing Virtual Machine Using PowerShell Script

Last Updated : 31 Mar, 2023

In this article, we will look into the process of resizing azure VMs at once using the Azure PowerShell automation script in the Azure portal by using the cloud shell.

Advantages of using the method approach:

Resizing Multiple VMs at once in a follow for select subscription
Saves the time of the User
Simplifying the Actions by Automating the process
Re-usable Script

Implementation:

Step 1: Log in to Azure Portal

Step 2: Open Cloud Shell and Select PowerShell

Step 3: Create a Folder named “Automation”

mkdir Automation

Step 4: Change directory

cd ./Automation/

Step 5: Create file “test-resize.ps1”

touch test-resize.ps1

Step 6: Azure PowerShell Script

Change the following two-line in the below-given code:

Line Number 3 >> $VMsList = @(“TestVM”, “TestVM2″,”TestVM3”,…) #Provide your VM List that need to be resized
Line Number 4 >> $NewAzureSize = “Standard_B2s” #Provide your New Azure VM Size

Then, paste the code in test-resize.ps1 file and save and close.

$AzVMs = Get-AzureRmVM | Select-Object -Property Name, ResourceGroupName, Location, Type, ProvisioningState

$VMsList = @("TestVM", "TestVM2", "TestVM3") #Provide your VM List that need to be Resized
$NewAzureSize = "Standard_B2s" #Provide your New Azure VM Size

foreach ($VM in $AzVMs)
{
   $VMName = $VM.Name
   $ResourceGroupName = $VM.ResourceGroupName
   $Type = $VM.Type
   $Location = $VM.Location
   $ProvisioningState = $VM.ProvisioningState

    if ($VMsList -contains $VMName)
    {
        Write-Host "--------------------------------------------------------------------"
        Write-Host "Virtual Machine: $VMName"
        Write-Host "ResourceGroup  : $ResourceGroupName"
        Write-Host "Location   : $Location"
        Write-Host "ResourceType   : $Type"
        Write-Host "ProvisioningState   : $ProvisioningState"    
        Write-Host "--------------------------------------------------------------------"
        Write-Host "Deallocating $VMName VM."
        Stop-AzVM -ResourceGroupName $ResourceGroupName -Name $VMName -Force
        Write-Host "$VMName VM Stopped."
        Write-Host "--------------------------------------------------------------------"
        Write-Host "Updating $VMName VMSize."
        $vm = Get-AzVM -ResourceGroupName $ResourceGroupName -VMName $VMName
        $vm.HardwareProfile.VmSize = $AzureSize
        Update-AzVM -VM $vm -ResourceGroupName $ResourceGroupName
        Write-Host "Successfully resized $VMName VM to size $NewAzureSize."
        Write-Host "--------------------------------------------------------------------"
        Write-Host "Starting $VMName VM"
        Start-AzVM -ResourceGroupName $ResourceGroupName -Name $VMName
        Write-Host "$VMName VM Started."
        Write-Host "--------------------------------------------------------------------"
    }
}

Step 7: Now, it’s time to run the code. Use the following syntax to execute the Azure PowerShell script for Resizing.