我使用Elastic Beanstalk环境来部署Web应用程序，并且为应用程序将在其上运行的实例设置了IAM角色。
一切都可以在99.99％的时间内正常工作，但是间歇性地，我会在日志中看到错误，并且请求失败显示如下所示的botocore错误：
File "/opt/python/run/venv/local/lib/python3.6/site-packages/boto3/resources/factory.py", line 339, in property_loader
self.load()
File "/opt/python/run/venv/local/lib/python3.6/site-packages/boto3/resources/factory.py", line 505, in do_action
response = action(self, *args, **kwargs)
File "/opt/python/run/venv/local/lib/python3.6/site-packages/boto3/resources/action.py", line 83, in __call__
response = getattr(parent.meta.client, operation_name)(**params)
File "/opt/python/run/venv/local/lib/python3.6/site-packages/botocore/client.py", line 357, in _api_call
return self._make_api_call(operation_name, kwargs)
File "/opt/python/run/venv/local/lib/python3.6/site-packages/botocore/client.py", line 648, in _make_api_call
operation_model, request_dict, request_context)
File "/opt/python/run/venv/local/lib/python3.6/site-packages/botocore/client.py", line 667, in _make_request
return self._endpoint.make_request(operation_model, request_dict)
File "/opt/python/run/venv/local/lib/python3.6/site-packages/botocore/endpoint.py", line 102, in make_request
return self._send_request(request_dict, operation_model)
File "/opt/python/run/venv/local/lib/python3.6/site-packages/botocore/endpoint.py", line 132, in _send_request
request = self.create_request(request_dict, operation_model)
File "/opt/python/run/venv/local/lib/python3.6/site-packages/botocore/endpoint.py", line 116, in create_request
operation_name=operation_model.name)
File "/opt/python/run/venv/local/lib/python3.6/site-packages/botocore/hooks.py", line 356, in emit
return self._emitter.emit(aliased_event_name, **kwargs)
File "/opt/python/run/venv/local/lib/python3.6/site-packages/botocore/hooks.py", line 228, in emit
return self._emit(event_name, kwargs)
File "/opt/python/run/venv/local/lib/python3.6/site-packages/botocore/hooks.py", line 211, in _emit
response = handler(**kwargs)
File "/opt/python/run/venv/local/lib/python3.6/site-packages/botocore/signers.py", line 90, in handler
return self.sign(operation_name, request)
File "/opt/python/run/venv/local/lib/python3.6/site-packages/botocore/signers.py", line 157, in sign
auth.add_auth(request)
File "/opt/python/run/venv/local/lib/python3.6/site-packages/botocore/auth.py", line 357, in add_auth
raise NoCredentialsError
tocore.exceptions.NoCredentialsError: Unable to locate credentials
我不知道这是否只是一种竞争条件，其中IAM凭据正在轮换（或类似的方式）并且实例的boto客户端正在尝试使用它们。
有关修复或妥善处理此故障的任何技巧？
P.S。
boto3==1.9.75
botocore==1.12.239
python==3.6.8
我们有同样的问题。我在botocore存储库Intermittent NoCredentialsError('Unable to locate credentials') error #1965]中打开了一个问题
我们现在使用的解决方法是通过重试错误装饰器来重试。到目前为止，它仍然有效。