所有测功机在完成 heroku 本地后立即停止

Question

我有一个非常简单的FLASK网络服务器，我在heroku平台的网络dyno中运行。我还有一个非常简单的python程序，它运行在一个单独的dyno上，它打印"hello world"然后退出。

我的程序文件看起来像这样

web: gunicorn --bind 0.0.0.0:$PORT wsgi
test: python helloWorld.py

使用heroku本地，一旦hello world程序完成，网络dyno也会被杀死：

$ heroku local
8:54:29 AM test.1 |  Hello World
[DONE] Killing all processes with signal  SIGINT
8:54:29 AM test.1 Exited Successfully
8:54:29 AM web.1  |  Traceback (most recent call last):
8:54:29 AM web.1  |    File "/anaconda3/bin/gunicorn", line 7, in <module>
8:54:29 AM web.1  |      from gunicorn.app.wsgiapp import run
8:54:29 AM web.1  |    File "/anaconda3/lib/python3.7/site-packages/gunicorn/app/wsgiapp.py", line 9, in <module>
8:54:29 AM web.1  |      from gunicorn.app.base import Application
8:54:29 AM web.1  |    File "/anaconda3/lib/python3.7/site-packages/gunicorn/app/base.py", line 11, in <module>
8:54:29 AM web.1  |      from gunicorn._compat import execfile_
8:54:29 AM web.1  |    File "/anaconda3/lib/python3.7/site-packages/gunicorn/_compat.py", line 267, in <module>
8:54:29 AM web.1  |      import inspect
8:54:29 AM web.1  |    File "/anaconda3/lib/python3.7/inspect.py", line 1087, in <module>
8:54:29 AM web.1  |      'args, varargs, varkw, defaults, kwonlyargs, kwonlydefaults, annotations')
8:54:29 AM web.1  |    File "/anaconda3/lib/python3.7/collections/__init__.py", line 397, in namedtuple
8:54:29 AM web.1  |      exec(s, namespace)
8:54:29 AM web.1  |    File "<string>", line 1, in <module>
8:54:29 AM web.1  |  KeyboardInterrupt
8:54:29 AM web.1  Exited with exit code null    

我该如何防止这种情况？

我知道问题出在 helloWorld.py 退出。如果我创建的脚本不会终止，则不会出现问题。

print("Hello World", flush=True)
while True:
    pass

Answer 1

显然这是工头的故意行为。请参阅Github上的讨论：

福尔曼假设所有的过程都是长期存在的。如果任何进程退出，Foreman 将停止所有进程。

唯一的解决办法就是让 HelloWorld.py 长寿。