How to add a disk to already created VM?

[gauravkanojia]

Hi there folks, I'm facing issues when trying to add a new additional hard disk to an already created VM. I browsed through https://pve.proxmox.com/pve-docs/api-viewer/ and understood the structure but getting 501 Not Implemented: {"data":null}
Here is my code:

vmIds = array('i', [208])

headIds = array('i', [3302])

vmIdIdx = 0

for HEAD in headIds:
    vmId = vmIds[vmIdIdx]
    headId = 'proxmox-' + str(HEAD)
    print('proxmox-node -->' + headId, ' | VMID -->' + str(vmId))

    qemu_node = proxmox.nodes(headId)
    vm_config_old = qemu_node.qemu(vmIds[vmIdIdx]).config.get()
    print('Host details before adding disk')
    pp.pprint(vm_config_old)

#     pp.pprint(qemu_node.storage.get(storage='xxx-xxxx-vol-xx1')) # This line prints fine
    qemu_node.storage.content.create(filename='var/lib/docker-config',
                                     vmid=vmId, node=headId,
                                     storage='xxx-xxxx-vol-xx1', size='32767M', format='qcow2')
    vm_config_new = qemu_node.qemu(vmIds[vmIdIdx]).config.get()
    print('Host details after adding disk')
    pp.pprint(vm_config_new)
    vmIdIdx = vmIdIdx + 1

Here is the error:

Traceback (most recent call last):
  File "add_disk_to_tr1_vm.py", line 47, in <module>
    storage='netapp-prod-vol-ds1', size='32767M', format='qcow2')
  File "/usr/local/lib/python2.7/site-packages/proxmoxer/core.py", line 96, in create
    return self.post(*args, **data)
  File "/usr/local/lib/python2.7/site-packages/proxmoxer/core.py", line 87, in post
    return self(args)._request("POST", data=data)
  File "/usr/local/lib/python2.7/site-packages/proxmoxer/core.py", line 79, in _request
    resp.content))
proxmoxer.core.ResourceException: 501 Not Implemented: {"data":null}

Any pointers will be helpful.
Thanks.