Azure powershell command to get the uptime for all vms - powershell

Question

I am trying to generate a report where can I see uptime for all my VMs using PowerShell.
We are using AzureRmVM-(Resource manager) for those VMs.
At the moment I have found something like this:
ForEach ($vm in $vmsList) { $vm.Name + " - " + $vm.ResourceGroupName }
get-vm | where {$_.state -eq 'running'} | sort Uptime | select Name,Uptime,#{N="MemoryMB";E={$_.MemoryAssigned/1MB}},Status
How can I do that using powershell - rm(Resource manager)?

Answer 1

Collect all running VMs of your Subscription:
$AllVMs = Get-AzVM -Status | Where-Object { $_.PowerState -Like 'VM running' }
Then interate through each VM, catch the Audit Log, search for the VM start and calculate the Time difference to the current Time.
# Create Custom Object
$UptimeReport = #()
# Walk through each VM
foreach ($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
}
}
}
Finally, print the Result:
# Print Result
return $UptimeReport | Sort-Object -Property VM | ft * -AutoSize