How to get the uptime/last reboot time for all Azure VMs

Question

Hi Team,

How to get the uptime/last reboot time for all Azure VMs using PowerShell.
what kind of permissions needed for this activity on VM. Please suggest.

I did try with get-cim but it helped for few VM's. Our cloud environment has both Windows & Linux VMs.

Ciao

Answer 1

Hello @Sky High ,
Can you take a look at the script mentioned in the below dicussion.

https://stackoverflow.com/questions/42721460/azure-powershell-command-to-get-the-uptime-for-all-vms

$AllVMs = Get-AzVM -Status | Where-Object { $_.PowerState -Like 'VM running' }
$UptimeReport = @()

//Walk through each VM
foreach ($VM in $AllVMs) {

# Get Subscription Information  
$ctx = Get-AzContext  
Write-Host "Check: '$($VM.Name)' in Subscription '$($ctx.Subscription.Name)'"  
  
# Get the Activity Log of the VM  
$VMAzLog = Get-AzLog -ResourceId $VM.Id `  
| Where-Object { $_.OperationName.LocalizedValue -Like 'Start Virtual Machine' } `  
| Sort-Object EventTimestamp -Descending `  
| Select-Object -First 1  
$BootTime = $VMAzLog.EventTimestamp  

if ($BootTime) {  
    $Uptime = '{0}:{1:D2}:{2:D2}' -f (24 * $TimeSpan.Days + $TimeSpan.Hours), $TimeSpan.Minutes, $TimeSpan.Seconds  
}  
else {  
    $Uptime = "n/a"   
}  

if ($BootTime) {  
      
    $TimeSpan = New-TimeSpan -Start $($VMAzLog.EventTimestamp) -End (Get-Date)  

    $UptimeReport += [PSCustomObject]@{  
        VM             = $VM.Name  
        SubscriptionId = $ctx.Subscription.id  
        Uptime         = $Uptime  
    }  
}  

}

regards,
Shiva