code: def _start_instance(self):
          
          try:
              vm_start = self.compute.virtual_machines.start(
                  self.running_instance_id, self.running_instance_id
              )
          except Exception as error:
              raise AzureCloudException(
                  'Unable to start instance: {0}.'.format(error)
              )
  
          vm_start.wait()
docs: Start the instance.