Inferring Azure VM properties from string using Python SDK

Question

Given an Azure VM size as string (e.g. "STANDARD_A4_v2") I would like to programmatically infer available memory and number of vCPUs. I've looked through azure-mgmt-compute but can't find what I'm looking for. I saw this post using a ComputeManagementClient to iterate over all available VM sizes, but that's not what I need and furthermore in my case I only have access to Azure Batch credentials. Do I have to role my own (at least for vCPUs) following the naming conventions?

Many thanks,

Andreas

Charles Xu · Accepted Answer · 2020-08-05 03:07:35Z

1

The issue that you have seen is what you need. The virtual_machine_sizes only have one function and it's the list. So you need to find your real VM size in the list. For example:

compute_client = CompteManagementClient(credentials, subscription_id)
vmSizes = compute_client.virtual_machine_sizes.list(location)
for vmSize in vmSizes:
  if(vmSize.name == "STANDARD_A4_v2")
    print("number of vCPU: " + vmSize.number_of_cores)
    print("available memory: " + vmSize.memory_in_mb)

And naming conventions are the rules that how does Azure define the VM size. You just need to read it to understand the VM size.

answered Aug 5, 2020 at 3:07

Charles Xu

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6 Comments

Andreas Over a year ago

Thanks Charles. I saw that logic in the post I linked. However in my case, I only have Azure Batch credentials, so I can't even initialize a CompteManagementClient(). Sure, I can parse the number of cores just from the name, but unfortunately I can't do that for memory size. Any idea idea how else to get that list (without subscription id etc.)?

Charles Xu Over a year ago

@Andreas Can you share your credential for Azure Batch? Which role do you have? You can only find the sizes in the document without a subscription, not in code.

Andreas Over a year ago

Thanks Charles. That answers it I guess.

Charles Xu Over a year ago

@Andreas OK, if it works for you please accept it as the answer.

Andreas Over a year ago

Hi Charles, I'll accept this answer. The only caveat is that you can't achieve the above just with just Batch credentials, if I understood correctly.

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A Modgil · Accepted Answer · 2020-08-05 02:43:33Z

0

You should be able to use Azure command line and get the result directly e.g. az vm List-sizes -l AustraliaEast

this gives me following result

Document you can refer to -- https://learn.microsoft.com/en-us/cli/azure/vm?view=azure-cli-latest#az-vm-list-sizes

Note you need to login using 'Az login' first before you can execute the above command

answered Aug 5, 2020 at 2:43

A Modgil

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1 Comment

Andreas Over a year ago

Thanks. In my case I need to do this from within a Python environment, which only holds Azure Batch credentials

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