Find all VMs that require maintenance and perform maintenance on them

Howdy,

I needed to perform maintenance on a bunch of VMs across many subs (mostly dev resource groups). So I could just perform maintenance and not worry about breaking things.

Here’s the core of the script:

$rg = '%rg_name%'
$vms = get-azurermvm -ResourceGroupName $rg -Status
$vms.Where({$PSItem.MaintenanceRedeployStatus.IsCustomerInitiatedMaintenanceAllowed -eq 'true'}) |  ForEach-Object {
    Restart-AzureRmVM -PerformMaintenance -Name $PSItem.Name -ResourceGroupName $rg -AsJob
}

I think the script itself is pretty self explanatory. Additional reading here.
So this whole blog post is mostly about pointing out the -AsJob switch. As without it each vm takes like 15-20 minutes to complete and if you have hundreds of them there is chance you dont want to wait days.

You could obviously wrap a couple of other loops around it, like go through resource groups or go through subs:

Get-AzureRMSubscription | ForEach-Object { 
  Select-AzureRmSubscription -SubscriptionName %sub_name%
  Get-AzureRmResourceGroup | ForEach-Object {
    $rg = $_.Name
    $vms = get-azurermvm -ResourceGroupName $rg -Status
    $vms.Where({$PSItem.MaintenanceRedeployStatus.IsCustomerInitiatedMaintenanceAllowed -eq 'true'}) |  ForEach-Object {
      Restart-AzureRmVM -PerformMaintenance -Name $PSItem.Name -ResourceGroupName $rg -AsJob
    }
  }
}

Written on December 29, 2017