Celery + Flask + Docker, consumer: Cannot connect to amqp://admin:**@rabbit:5672/myhost: failed to resolve broker hostname
I had a similar issue that I was able to resolve by specifying the version of dnspython, one of eventlets dependencies, to 1.16.0 in my requirements.txt above eventlet. It looks like eventlet is not compatible with the latest version of dnspython, more info here https://github.com/eventlet/eventlet/issues/619