Update-AzureRmVmss command is not working

Question

I created azure vm scale set with custom script extension. After some time I updated custom script extension and wanted to apply changes on each virtual machine on scale set. However nothing is changing. To update VM Scale Set I used Update-AzureRmVmss command in powershell. There is not any error message, command executes successfully

Your issue could be related to https://github.com/MicrosoftDocs/azure-docs/issues/15359 You need to remove the old extension first and then update the extension as described in the solution for the above GitHub issue. — Karishma Tiwari - MSFT, Sep 25 '18 at 20:56

4c74356b41 · Answer 1 · 2018-07-09T07:56:17.330

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I would say you VMSS is set to update mode manual, so you need to force the node update.

https://learn.microsoft.com/en-us/powershell/module/azurerm.compute/update-azurermvmssinstance?view=azurermps-6.4.0

another thing you are missing: forceUpdateTag. check this: How to force VM created with an ARM template + CustomScriptExtension to redownload the script and run it?

edited Jul 09 '18 at 07:56

answered Jul 09 '18 at 05:53

4c74356b41

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beat me too it! :) – Lachie White Jul 09 '18 at 05:55
How can I add forceUpdateTag property? – support_ms Jul 09 '18 at 11:57
I don't have any idea how to do it – support_ms Jul 10 '18 at 05:30

Neil Sant Gat · Answer 2 · 2018-07-12T05:33:55.140

It sounds like you need to update the "forceUpdateTag" property in the scale set extension profile. You can do this in your ARM template by adding this property at the same level as "publisher" and giving it any value you want (as long as it's different from the previous value). You can also do the same in Powershell and Az CLI using code like the following:

Powershell:

$vmss = Get-AzureRmVmss -ResourceGroupName YOUR_RG_NAME -Name YOUR_VMSS_NAME
    $vmss.VirtualMachineProfile.ExtensionProfile.Extensions[0].ForceUpdateTag="1"
    Update-AzureRmVmss -ResourceGroupName YOUR_RG_NAME -VMScaleSetName YOUR_VMSS_NAME -VirtualMachineScaleSet $vmss

CLI:

    # run the first time
    az vm extension set -g ...

    # run again
    az vm extension set --force-update -g ...

It's a bit complicated in some cases, so I threw together a quick blog post describing it: https://negatblog.wordpress.com/2018/07/11/rerun-extensions-in-azure/

Hope this helps! :) -Neil

Update-AzureRmVmss command is not working

2 Answers2