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docker-compose does not show container's stdout logs – Debian

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I developed a few services in python that are supposed to communicate via rabbitmq. Python scripts look correct. Event after I moved them to docker containers, they continue look working (‘Waiting for messages’ line is generated by the payload script):

grafalex@debian:~/Work/partitioner/worker$ docker run -it --network partitioner_pocnetwork worker:latest
 [*] Waiting for messages. To exit press CTRL+C

The issue is that once I am running the same through docker-compose I can no longer see any logs. Sometimes part of the log may appear in the console, but just a part.

grafalex@debian:~/Work/partitioner/worker$ docker-compose up worker1
Starting partitioner_worker1_1 ... done
Attaching to partitioner_worker1_1

Here is the docker-compose.yml snippet for this

version: "3.9"
services:
  worker1:
    image: worker:latest
    restart: always
    networks:
      - pocnetwork
...
networks:
  pocnetwork:

What can be the problem with missing logs? Can it be some kind of stdout buffering (and if so how can I fix that)?

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2

Answers


  1. Chosen as BEST ANSWER
    0

    The problem is not related to networking. The problem is in buffered output. As @DavidMaze pointed in the comment, solution is well described in Python app does not print anything when running detached in docker.

    I just had to add '-u' flag to the python interpreter to make the output unbuffered, so that it appears in the log immediately.


  2. 0

    Since you seem to be using a pre-existing docker network, the equivalent to your docker run command in docker-compose should look like:

      worker1:
    image: worker:latest
    restart: always
    networks:
      - pocnetwork
  networks:
    pocnetwork:
      external: true
      name: partitioner_pocnetwork

    You need to declare the external network first. Does this solve your problem?

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