Add support for OS Disk resize in VMSS

[marstr]

In Azure/azure-sdk-for-go#818, @bpoland says:
Hi there,

Wondering if it would be possible to add support for resizing an OS disk when deploying a Virtual Machine Scale Set.

The standalone Virtual machine supports an OsDiskSizeInMB property:
https://github.com/Azure/azure-sdk-for-go/blob/c1ff18326387fa67ccc6e1b17c76e65773684227/arm/compute/models.go#L2267
However, the Scale Set is missing that property:
https://github.com/Azure/azure-sdk-for-go/blob/c1ff18326387fa67ccc6e1b17c76e65773684227/arm/compute/models.go#L1994
I have been able to deploy a scale set with an ARM template specifying a disk size property like this (using API version 2017-03-30) so I know it's possible:

"storageProfile": {
   "osDisk": {
   "caching": "ReadWrite",
   "createOption": "FromImage",
   "diskSizeGB": "10",
   "name": "[concat(variables('vmssName'), '-osp')]",
   "osType": "Linux",
   "image": {
        "uri": "[variables('vmssImageUri')]"
    }
  }
},

Hope that makes sense -- thanks!

The relevant Swagger Definitions that map to those Go declarations can be found here:

azure-rest-api-specs/specification/compute/resource-manager/Microsoft.Compute/2017-03-30/compute.json

Line 3496 in 02a8a6b

"VirtualMachineSize": {

azure-rest-api-specs/specification/compute/resource-manager/Microsoft.Compute/2017-03-30/compute.json

Line 5426 in 02a8a6b

"VirtualMachineScaleSetOSDisk": {

[tombuildsstuff]

@marstr 👋 any idea if this is prioritised / when this is likely to land?

[marstr]

Thanks for the ping on this, @tombuildsstuff! I don't have much visibility there at the moment. I've added the labels above to hopefully send it into triage. I'll keep an eye on this issue to make sure it gets addressed.

[ig-sinicyn]

Any update on this?
Ok, answering to myself. The os disk image resize works with latest api version (2018-10-01), but new image size is applied only on VM reimage

[ig-sinicyn]

UPD#2: important: the resize works only once. Any consequent deploy with different diskSizeGB will fail with Changing property 'osDisk.diskSizeGB' is not allowed error.

[Drewm3]

Cleaning up old issues from 2016 - 2018. Please reactivate this if it is still a problem.