go - Docker port expose issue, Recv failure: Connection reset by peer

Question

I am trying to run a Go app binary in a docker container. The app has some gRPC request being listen and server on:

http.ListenAndServe("localhost:8081", nil)

In my docker-compose.yaml. I have a service of the app mapped to 8081:

  golangAPP:
    build:
      context: .
      dockerfile: ./docker/golangAPP/Dockerfile
    depends_on:
      - setup
    ports:
      - 8081:8081

After docker-compose up I can see the verbose that the app is being served.

But I still cannot reach it. curl -X OPTIONS http://localhost:8081 return

curl: (56) Recv failure: Connection reset by peer

If I run the binary locally without docker, then I can send request to the app.

Any suggestion? I did some googling and some point to firewall issue. But I am not sure how to proceed.

Answer 1

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