无法从 docker-compose 容器打印到 Docker 桌面应用程序

Question

I am trying to print from a docker-compose container to the terminal/docker desktop app or wehere ever I will be able to see it. But it doesn't work for some reason.

What I already tried using:

• -u flag
• stdin_open: true and tty: true in the docker-compose
• flush=True in the print statment

But none of it working.
Can someone please help me figer this out?.

I am running it using the following command:
docker-compose up -d

this is my docker-compose:

version: '3.5'

environment:
  PYTHONUNBUFFERED=1

services:
  relay:
    container_name: relay
    image: image
    command: python3 -u server.py
    expose:
      - "443"
    networks:
      pNetwork1:
        ipv4_address: 10.1.0.3
    stdin_open: true
    tty: true

and this is my server.py:

def main():
    print("Please Work!", flush=True)
if __name__ == "__main__":
    main()

Answer 1

You can try setting the environment variable PYTHONUNBUFFERED in the docker-compose.yml file.

environment:

• PYTHONUNBUFFERED=1

This will force python to not buffer the output and should print the output to the terminal.