I want to update the tags to existing vms

Question

Hi Team,

I want to update tags to all VMS in our tenant.
I only have vm names in the CSV/Excel format as input. However, I know the tags to be updated. Also we have existing tags attached to these VMS. I would want to add few tags to the VMS. How can I achieve this using powershell in one go.

For the command to get executed, it needs resourcegroup name and resourceid. How do we get this.

Ciao

Answer 1

@Sky High ,
Here is the complete script:

Please Note:
Script was written based upon the below CSV format, if you format is different please modify it accordingly !

$csv = import-csv ".\vmswithtags.csv" #Read all the VMs and their tags to be applied (Please see the format)
$listOfVMsAndTags = @{} #Hashtable to store all the existing VMs & Corresponding Tags which are read from .csv file
foreach($vm in $csv) {

$listOfVMsAndTags.Add($vm.vmname ,$vm.tag)

}

$VMResources = Get-AzVM #Get all the VMs, Resource groupnames
foreach($VMResource in $VMResources)
{

Get existing TAGS

$existingTags = (Get-AzResource -ResourceGroupName $VMResource.ResourceGroupName -Name $VMResource.Name).Tags

Search and find the corresponding tags from the hashtable

$tagsTobeApplied = $listOfVMsAndTags[$VMResource.Name]

Append to existing tags variable

$existingTags += @{$tagsTobeApplied.Split('=')[0]=$tagsTobeApplied.Split('=')1}

Set back the tags

Set-AzResource -ResourceGroupName $VMResource.ResourceGroupName -name $VMResource.ResourceGroupName -ResourceType "Microsoft.Compute/VirtualMachines" -Tag $existingTags
}

Answer 2

Hello @Sky High ,
Thanks for reaching out to Microsoft Q&A.
Below is part of the script will get all the VMs and their corresponding resource groups - get their existing tags and update with required tag;

$VMResources = Get-AzVM
foreach($VMResource in $VMResources)
{
Write-Host $VMResource.ResourceGroupName
$tags = (Get-AzResource -ResourceGroupName $VMResource.ResourceGroupName -Name $VMResource.Name).Tags
$tags += @{test2="test2"}
Set-AzResource -ResourceGroupName $VMResource.ResourceGroupName -name $VMResource.ResourceGroupName -ResourceType "Microsoft.Compute/VirtualMachines" -Tag $tags
}

Reference Document: https://learn.microsoft.com/en-us/azure/virtual-machines/tag-powershell

You might want to write remaining part of the script which will loop through csv file - get the corresponding VMs & Tags , compare the VM names and update only those tags accordingly.

Let us know if you need help in writing the other part of the script.