How can I install .NET 8.0.12 on multiple VMs on azure?

Question

I need a script that will enable me to install .NET 8.0 on a multiple VMs in Azure.

Answer 1

Hello,

Welcome to Microsoft Q&A,

You can use the below PowerShell script to install the .Net 8 on all the VMs.

# Azure Login (if not already authenticated)
Connect-AzAccount

# Define variables
$resourceGroup = "YourResourceGroup"
$targetVMs = @("VM1", "VM2", "VM3")  # List of specific VM names


# PowerShell script for remote execution
$remoteScript = @"
# Ensure winget is installed
if (-not (Get-Command winget -ErrorAction SilentlyContinue)) {
    Write-Host "winget not found, skipping installation"
    exit 1
}

# Install .NET 8.0
Write-Host "Installing .NET 8.0..."
winget install Microsoft.DotNet.Runtime.8 --silent --accept-package-agreements --accept-source-agreements

# Uninstall older .NET versions (1.x - 7.x)
Write-Host "Checking for older .NET versions..."
$installedVersions = Get-WmiObject -Query "SELECT * FROM Win32_Product WHERE Name LIKE 'Microsoft .NET%'" | Select-Object Name
foreach (\$version in \$installedVersions) {
    if (\$version.Name -match 'Microsoft .NET (Core|Runtime) [1-7]\.') {
        Write-Host "Uninstalling: \$version.Name"
        \$app = Get-WmiObject -Query "SELECT * FROM Win32_Product WHERE Name='\$version.Name'"
        \$app.Uninstall()
    }
}
Write-Host "Update completed successfully!"
"@
# Iterate through only the specified VMs
foreach ($vmName in $targetVMs) {
    $vm = Get-AzVM -ResourceGroupName $resourceGroup -Name $vmName -Status
    if ($vm -eq $null) {
        Write-Host "VM $vmName not found in resource group $resourceGroup. Skipping..."
        continue
    }
    if ($vm.PowerState -eq "VM running") {
        Write-Host "Processing VM: $vmName - Installing .NET 8 and removing old versions"
        Invoke-AzVMRunCommand -ResourceGroupName $resourceGroup -Name $vmName -CommandId "RunPowerShellScript" -ScriptString $remoteScript
    } else {
        Write-Host "Skipping $vmName: VM is not running"
    }
}

Please Upvote and Accept the answer if it helps!!

Answer 2

I got stuck with the following error:

At line:11 char:30

•     Write-Host "Skipping $vmName: VM is not running"
  

•                          ~~~~~~~~
  

Variable reference is not valid. ':' was not followed by a valid variable name character. Consider using ${} to

delimit the name.

+ CategoryInfo          : ParserError: (:) [], ParentContainsErrorRecordException

+ FullyQualifiedErrorId : InvalidVariableReferenceWithDrive

Answer 3

Hello,

I was experiencing the same issue, but I managed to resolve it using the following powershell script. I'm sharing this for anyone else who, like me, stumbled upon this Q&A without finding a working solution.

if ($null -eq (Get-AzContext)) {
    Connect-AzAccount
}
$AllWindowsVMs = Get-AzVM -Status | Where-Object { $_.StorageProfile.OsDisk.OsType -eq 'Windows' }
$SelectedVMs = $AllWindowsVMs | Select-Object Name, ResourceGroupName, PowerState, Location | Out-GridView -PassThru -Title "Selecteer de VM's (Ctrl+Click voor meerdere)"
if ($null -eq $SelectedVMs) {
    Write-Warning "No VM's selected"
    break
}
$LocalScriptPath = "$env:TEMP\InstallDotNetRunCommand.ps1"
$ScriptContent = @'
$Url = 'https://builds.dotnet.microsoft.com/dotnet/Runtime/8.0.22/dotnet-runtime-8.0.22-win-x64.exe'
$Dest = "$env:TEMP\dotnet-runtime-8.0.22-win-x64.exe"
[Net.ServicePointManager]::SecurityProtocol = [Net.SecurityProtocolType]::Tls12
try {
    Invoke-WebRequest -Uri $Url -OutFile $Dest -UseBasicParsing -ErrorAction Stop
}
catch {
    Write-Error "Download failed: $_"
    return
}
if (Test-Path $Dest) {
    $Proc = Start-Process -FilePath $Dest -ArgumentList '/install', '/quiet', '/norestart' -PassThru -Wait
    Write-Output "Installatie op $env:COMPUTERNAME afgerond. ExitCode: $($Proc.ExitCode)"
    
    Remove-Item -Path $Dest -Force -ErrorAction SilentlyContinue
}
'@
Set-Content -Path $LocalScriptPath -Value $ScriptContent -Force
foreach ($VM in $SelectedVMs) {
    $IsRunning = $false
    
    try {
        $VMStatus = Get-AzVM -ResourceGroupName $VM.ResourceGroupName -Name $VM.Name -Status -ErrorAction Stop
        if ($VMStatus.Statuses) {
            foreach ($Status in $VMStatus.Statuses) {
                if ($Status.Code -eq 'PowerState/running') {
                    $IsRunning = $true
                    break
                }
            }
        }
        if ($IsRunning) {
            Write-Output "VM $($VM.Name) is active. Start installation..."
            $Result = Invoke-AzVMRunCommand -ResourceGroupName $VM.ResourceGroupName -VMName $VM.Name -CommandId 'RunPowerShellScript' -ScriptPath $LocalScriptPath -ErrorAction Stop
            Write-Output $Result.Value.Message
        }
        else {
            Write-Warning "VM $($VM.Name) is not turned on. Will be skipped."
        }
    }
    catch {
        Write-Error "Error executing on $($VM.Name): $_"
    }
}
if (Test-Path $LocalScriptPath) {
    Remove-Item -Path $LocalScriptPath -Force
}