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I have a flask application which is running as docker container. Flask application uses local mongodb. This docker container is not able to connect to local mongodb.

I have tried following option :

  • set --network="host" in docker run ... command

  • set MONGO_URI = "mongodb://host-ip-address:27017/model-service-sample",

  • set MONGO_URI = "mongodb://container-gateway-ip-address:27017/model-service-sample"

None of the above options worked.

Can anyone please suggest a way to accomplish this?

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  • Are you using MacOS? Commented Aug 6, 2019 at 1:05
  • did you expose port for mongo when docker run -p xxxx:27017 mongoimage ? Commented Aug 6, 2019 at 2:07
  • @ThanhNguyenVan , yes I am using macOS and my mongodb is not running as docker container, my flask application which is running as a docker container needs to access local mongodb Commented Aug 6, 2019 at 2:45

1 Answer 1

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For MacOS you should use:

host.docker.internal or gateway.docker.internal

for connecting from a container to a service on the host.

refer : https://docs.docker.com/docker-for-mac/networking/#/known-limitations-use-cases-and-workarounds

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2 Comments

I read about this but couldn't quite understand what does host.docker.internal mean. Do I need to write this in my Dockerfile?
no, change MONGO_URI = "mongodb://container-gateway-ip-address:27017/model-service-sample" to MONGO_URI = "mongodb://gateway.docker.internal:27017/model-service-sample"

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