无法使用 Gunicorn 启动 FlasklApp

Question

尝试在虚拟环境中在 Gunicorn 20.1.0 gunicorn main:app 下启动 Python 3.6.9 Flask 应用程序，我收到 ModuleNotFoundError: No module named flask

产生的错误：

[2021-09-01 08:33:29 -0400] [4185] [INFO] Starting gunicorn 20.1.0
[2021-09-01 08:33:29 -0400] [4185] [INFO] Listening at: http://127.0.0.1:8000 (4185)
[2021-09-01 08:33:29 -0400] [4185] [INFO] Using worker: sync
[2021-09-01 08:33:29 -0400] [4188] [INFO] Booting worker with pid: 4188
[2021-09-01 08:33:29 -0400] [4188] [ERROR] Exception in worker process
Traceback (most recent call last):
  File "/home/spsimmons/.local/lib/python3.6/site-packages/gunicorn/arbiter.py", line 589, in spawn_worker
    worker.init_process()
  File "/home/spsimmons/.local/lib/python3.6/site-packages/gunicorn/workers/base.py", line 134, in init_process
    self.load_wsgi()
  File "/home/spsimmons/.local/lib/python3.6/site-packages/gunicorn/workers/base.py", line 146, in load_wsgi
    self.wsgi = self.app.wsgi()
  File "/home/spsimmons/.local/lib/python3.6/site-packages/gunicorn/app/base.py", line 67, in wsgi
    self.callable = self.load()
  File "/home/spsimmons/.local/lib/python3.6/site-packages/gunicorn/app/wsgiapp.py", line 58, in load
    return self.load_wsgiapp()
  File "/home/spsimmons/.local/lib/python3.6/site-packages/gunicorn/app/wsgiapp.py", line 48, in load_wsgiapp
    return util.import_app(self.app_uri)
  File "/home/spsimmons/.local/lib/python3.6/site-packages/gunicorn/util.py", line 359, in import_app
    mod = importlib.import_module(module)
  File "/usr/lib/python3.6/importlib/__init__.py", line 126, in import_module
    return _bootstrap._gcd_import(name[level:], package, level)
  File "<frozen importlib._bootstrap>", line 994, in _gcd_import
  File "<frozen importlib._bootstrap>", line 971, in _find_and_load
  File "<frozen importlib._bootstrap>", line 955, in _find_and_load_unlocked
  File "<frozen importlib._bootstrap>", line 665, in _load_unlocked
  File "<frozen importlib._bootstrap_external>", line 678, in exec_module
  File "<frozen importlib._bootstrap>", line 219, in _call_with_frames_removed
  File "/home/spsimmons/Development/Websites/PPSPortal-III/restapi/main.py", line 1, in <module>
    from flask import Flask
ModuleNotFoundError: No module named 'flask'
[2021-09-01 08:33:29 -0400] [4188] [INFO] Worker exiting (pid: 4188)
[2021-09-01 08:33:29 -0400] [4185] [INFO] Shutting down: Master
[2021-09-01 08:33:29 -0400] [4185] [INFO] Reason: Worker failed to boot.

使用 Python python3 main.py 运行应用程序没有问题。

关于我在这里缺少什么的任何想法？谢谢！

Answer 1

这可能是因为您在 virtualenv 中使用了 python，但是您在虚拟环境之外安装了 gunicorn。

尝试激活您的虚拟环境并使用 pip 安装 gunicorn

pip install gunicorn

最后，运行相同的命令来启动您的应用程序，但使用安装在 virtualnev 中的 gunicorn 可执行文件。