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ECS.client.create_service() Incorrectly Requiring loadBalancers param

See original GitHub issue

Attempting to run ECS.client.create_service() without a load balancer. Per the documentation, loadBalancers parameter is not required:

When executed via boto3, I’m seeing the following error:

(Error code 400)
  File "/usr/local/lib/python3.5/site-packages/botocore/", line 310, in _api_call
    return self._make_api_call(operation_name, kwargs)
  File "/usr/local/lib/python3.5/site-packages/botocore/", line 407, in _make_api_call
    raise ClientError(parsed_response, operation_name)
  botocore.exceptions.ClientError: An error occurred (InvalidParameterException) when calling the CreateService operation: A role was passed, but no load balancers were present.

The aws_cli tool does not require the loadBalancers parameter.

Issue Analytics

  • State:closed
  • Created 8 years ago
  • Comments:7 (3 by maintainers)

github_iconTop GitHub Comments

mccammoncommented, Jan 26, 2016

Removing role fixes the issue. It appears that there is some confusion on whether adding a role param means that loadBalancers param is required: role:…“This parameter is only required if you are using a load balancer with your service.”

As stated before, role can be used with the aws_cli tool without requiring loadBalancers.

swetashrecommented, Oct 4, 2019

@mccammon - Not the documentation is updated with more detail. You can see in our documentation

Role: This parameter is only permitted if you are using a load balancer with your service and your task definition does not use the awsvpc network mode. If you specify the role parameter, you must also specify a load balancer object with the loadBalancers parameter.

I am closing the issue as the issue has been resolved.

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