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Azure•Cloud Computing

Add an existing VM to an Availability Set in Azure

July 20, 2020 by AJNI No Comments

Normally, adding an Availability Set after the VM has been deployed is not possible. You would have to delete the VM, leaving the NIC and OS disk intact and then re-creating the VM with the Availability Set. Of course that can be done manually, but there is a PowerShell script that does this all for us.

This can be all done in the Azure Cloud Shell, you do not have to install the PowerShell Module on a Windows Machine.

Install-Module AzureRm.AvailabilitySetManagement

Create an AS before adding the VM to the AS.

New-AzureRmAvailabilitySet -Location “West Europe” -Name “myAs” -ResourceGroupName “myRg” -Sku aligned -PlatformFaultDomainCount 3 -PlatformUpdateDomainCount 5

Now add the VM to the AS:

Add-AzureRmAvSetVmToAvailabilitySet -ResourceGroupName “myRg” -VMName “VM01” -OsType windows -AvailabilitySet “myAs”

This will stop the VM if it is running, delete the VM item (leaving the NIC and OS disk intact) and re-create that with the same VM size inside the newly created Availability Set.

References:

https://pixelrobots.co.uk/2018/02/add-existing-virtual-machine-availability-set-azure/

https://gist.github.com/PixelRobots/3c34027d225c7acb09833840b7258ee9#file-movevmavaset-ps1

Reading time: 1 min
Azure•Cloud Computing

Create a custom IAM Role in Microsoft Azure

June 22, 2020 by AJNI No Comments

Azure has a lot of pre-defined roles, but you can also create very specific roles with the help of Azure Powershell or Bash and a JSON config file. In this example, the user that gets this role is only able to start, stop, or restart a VM.

Start off by opening the cloud shell. If this is the first time opening it, a storage account must be created.

Create a new json config file and insert the following:

code role.json

{
"Name": "Virtual Machine Operator",
"IsCustom": true,
"Description": "Can deallocate, start and restart virtual machines.",
"Actions": [
"Microsoft.Compute/*/read",
"Microsoft.Compute/virtualMachines/start/action",
"Microsoft.Compute/virtualMachines/restart/action",
"Microsoft.Compute/virtualMachines/deallocate/action"
],
"NotActions": [
, "AssignableScopes": [ "/subscriptions/xxxx" ]
}

You can save with CTRL+S and exit the visual editor with CTRL+Q.

The role grants read permission and allow to start, restart, and stop the VM. Do not forget to add your subscription id at the end (line 16).

Create the role based off the template:

az role definition create –role-definition role.json

When assigning a role the custom role should also be listed. You can either assign this role to a Resource Group or the VM directly.

References:

https://stackoverflow.com/questions/23668154/allow-users-to-start-stop-particular-azure-vms

Reading time: 1 min

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