Quick Tip - Update a Tag on an Azure Resource
source link: https://thomasrayner.ca/quick-tip-update-a-tag-on-an-azure-resource/
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Quick Tip - Update a Tag on an Azure Resource
Working with Azure resources can be a bit of an adventure sometimes. Say you want to update a tag on an Azure resource. Not remove it, but change its value. If you try to add a tag with the same name but different value, you’ll get an error that the tag already exists. Some of the ways you have available to get rid of a tag involve dropping all the other tags assigned to a resource. So, what do you do?
In this example, I have a couple VMs with a tag named “user” and a value of “thmsrynr”, and I want to keep the tag but change the value to “Thomas”.
Well, this extravagant one-liner will do the trick.
Find-AzureRmResource -TagName user |
ForEach-Object { Get-AzureRmResource -ResourceId $_.ResourceId |
ForEach-Object { $tags = $_.Tags;
$tags['user'] = 'Thomas';
Set-AzureRmResource -Tag $tags -ResourceId $_.ResourceId } }
I like Find-AzureRmResource best for searching for resources with a specific tag, but it doesn’t return the tags for some reason that is beyond me. You can search by tag but the tags aren’t returned? Weird, right?
Anyway, I pipe everything I find into Get-AzureRmResource which is bad at searching for resources but DOES return the tags. Then for the resource I find, I store the tags on that resource in a temporary variable (named $tags), and then I work with the variable instead of working directly with the Azure object to update the “user” tag I care about. Then I set the tags on that resource to be what I stored. This should keep all the other tags intact, and update the value of one specific tag.
You could, and probably should, expand this into a more flexible function with parameters and filtering and such, but this example shows you how the tricky bits work.
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