当CTRL + C-ing docker组成时，如何从服务打印到终端（对SIGINT / SIGTERM作出反应）？

Question

我有一个服务（在那个例子中是python）在SIGINT / SIGTERM上打印一些东西。

printer.py：

import signal
import sys
import threading

def runner(stop_event):
    while not stop_event.wait(1):
        print('Hi.', flush=True)

stop_event = threading.Event()

def signal_handler(*_):
    stop_event.set()
    print('Bye.', flush=True)
    sys.exit(0)

signal.signal(signal.SIGINT, signal_handler)
signal.signal(signal.SIGTERM, signal_handler)

runner_thread = threading.Thread(target=runner, args=(stop_event,))
runner_thread.start()
runner_thread.join()

当在终端中正常运行并按CTRL + C时，它工作正常，即打印Bye.消息：

$ python3 printer.py 
Hi.
Hi.
^CBye.

但是当使用Docker compose和CTRL + C-ing运行时，Bye.永远不会显示。

Dockerfile：

FROM python:3.7
ADD printer.py .
CMD [ "python", "printer.py" ]

docker-compose.yml：

version: '2.4'

services:
  printer:
    build:
      context: .
      dockerfile: Dockerfile

终端互动：

$ docker-compose up
Creating network "compose_print_term_default" with the default driver
Creating compose_print_term_printer_1 ... done
Attaching to compose_print_term_printer_1
printer_1  | Hi.
printer_1  | Hi.
^CGracefully stopping... (press Ctrl+C again to force)
Stopping compose_print_term_printer_1 ... done

可以做些什么来使Bye.可见？

Answer 1

似乎是docker compose的一个问题，已经有几年了：https://github.com/docker/compose/issues/592