Creating a pool in Azure with python SDK

Question

I'm trying to create a pool based on standard marketplace ubuntu image. I'm using Azure 4.0.0, image refernce, vm config reference and other things are written based off learn.microsoft.com

Here's my code:

import azure.batch as batch
from azure.batch import BatchServiceClient
from azure.batch.batch_auth import SharedKeyCredentials
from azure.batch import models
import sys

account = 'mybatch'
key = 'Acj1hh7vMR6DSodYgYEghjce7mHmfgfdgodYgYEghjce7mHmfgodYgYEghjce7mHmfgCj/7f3Zs1rHdfgPsdlA=='
batch_url = 'https://mybatch.westeurope.batch.azure.com'

creds = SharedKeyCredentials(account, key)
batch_client = BatchServiceClient(creds, base_url = batch_url)


pool_id = 'mypool3'

if batch_client.pool.exists( pool_id ):
  print( 'pool exists' )
  sys.exit()

vmc = models.VirtualMachineConfiguration(
  image_reference = models.ImageReference(
    offer = 'UbuntuServer', 
    publisher = 'Canonical',
    sku = '16.04.0-LTS', 
    version = 'latest', 
    virtual_machine_image_id = None
  ) ,
  node_agent_sku_id = 'batch.node.ubuntu 16.04'
)

pool_config = models.CloudServiceConfiguration(os_family = '5')

new_pool = models.PoolAddParameter(
  id = pool_id, 
  vm_size = 'small', 
  cloud_service_configuration = pool_config, 
  target_dedicated_nodes = 1,
  virtual_machine_configuration = vmc
)

batch_client.pool.add(new_pool)

Here are some image values I took from the azure portal ( Add pool JSON Editor ):

>

"imageReference": {

"publisher": "Canonical",

"offer": "UbuntuServer",

"sku": "16.04.0-LTS"

},

But when I ran the code I get an error:

Traceback (most recent call last):
  File "a.py", line 80, in <module>
    batch_client.pool.add(new_pool)
  File "/root/miniconda/lib/python3.6/site-packages/azure/batch/operations/pool_operations.py", line 310, in add
    raise models.BatchErrorException(self._deserialize, response)
azure.batch.models.batch_error_py3.BatchErrorException: {'additional_properties': {}, 'lang': 'en-US', 'value': 'The value provided for one of the properties in the request body is invalid.\nRequestId:d8a1f7fa-6f40-4e4e-8f41-7958egas6efa\nTime:2018-12-05T16:18:44.5453610Z'}

What image values are wrong ? Is this possible to get more information on this error with RequestId ?

---

UPDATE

I found a newer example here which is using this helper select_latest_verified_vm_image_with_node_agent_sku to get the image ref. Same error The value provided for one of the properties in the request body is invalid.

Answer 1

I think there are a lof of confusing examples on the net, or they simply match older version of SDK.

Digging deeper into the docs I found this.

cloud_service_configuration CloudServiceConfiguration The cloud service configuration for the pool. This property and virtualMachineConfiguration are mutually exclusive and one of the properties must be specified. This property cannot be specified if the Batch account was created with its poolAllocationMode property set to 'UserSubscription'.

In my case I could use only cloud_service_configuration = pool_config or virtual_machine_configuration = vmc, but not both at the same time.

This is the working code:

new_pool = models.PoolAddParameter(
  id = pool_id, 
  vm_size = 'BASIC_A1', 
  target_dedicated_nodes = 1,
  virtual_machine_configuration = vmc
)