python - 由于 ModuleNotFoundError : No module named 'wsgi' ，Flask 无法使用 Docker 启动服务器

Question

我现在使用 Nginx 和 Docker 部署我的 Flask 应用程序。我的 docker 已启动并正在运行，但我总是得到 502 Bad Gateway nginx当去端点之一时。

所以我删除了所有 docker 并重新构建它，然后在运行 docker-compose up -d 时出现此错误:

[2020-03-09 15:00:11 +0000] [1] [INFO] Starting gunicorn 19.7.1
flask        | [2020-03-09 15:00:11 +0000] [1] [INFO] Listening at: http://0.0.0.0:5000 (1)
flask        | [2020-03-09 15:00:11 +0000] [1] [INFO] Using worker: sync
flask        | [2020-03-09 15:00:11 +0000] [7] [INFO] Booting worker with pid: 7
flask        | [2020-03-09 15:00:11 +0000] [7] [ERROR] Exception in worker process
flask        | Traceback (most recent call last):
flask        |   File "/usr/local/lib/python3.6/site-packages/gunicorn/arbiter.py", line 578, in spawn_worker
flask        |     worker.init_process()
flask        |   File "/usr/local/lib/python3.6/site-packages/gunicorn/workers/base.py", line 126, in init_process
flask        |     self.load_wsgi()
flask        |   File "/usr/local/lib/python3.6/site-packages/gunicorn/workers/base.py", line 135, in load_wsgi
flask        |     self.wsgi = self.app.wsgi()
flask        |   File "/usr/local/lib/python3.6/site-packages/gunicorn/app/base.py", line 67, in wsgi
flask        |     self.callable = self.load()
flask        |   File "/usr/local/lib/python3.6/site-packages/gunicorn/app/wsgiapp.py", line 65, in load
flask        |     return self.load_wsgiapp()
flask        |   File "/usr/local/lib/python3.6/site-packages/gunicorn/app/wsgiapp.py", line 52, in load_wsgiapp
flask        |     return util.import_app(self.app_uri)
flask        |   File "/usr/local/lib/python3.6/site-packages/gunicorn/util.py", line 352, in import_app
flask        |     __import__(module)
flask        | ModuleNotFoundError: No module named 'wsgi'
flask        | [2020-03-09 15:00:11 +0000] [7] [INFO] Worker exiting (pid: 7)
flask        | [2020-03-09 15:00:11 +0000] [8] [INFO] Booting worker with pid: 8
flask        | [2020-03-09 15:00:11 +0000] [8] [ERROR] Exception in worker process
flask        | Traceback (most recent call last):
flask        |   File "/usr/local/lib/python3.6/site-packages/gunicorn/arbiter.py", line 578, in spawn_worker
flask        |     worker.init_process()
flask        |   File "/usr/local/lib/python3.6/site-packages/gunicorn/workers/base.py", line 126, in init_process
flask        |     self.load_wsgi()
flask        |   File "/usr/local/lib/python3.6/site-packages/gunicorn/workers/base.py", line 135, in load_wsgi
flask        |     self.wsgi = self.app.wsgi()
flask        |   File "/usr/local/lib/python3.6/site-packages/gunicorn/app/base.py", line 67, in wsgi
flask        |     self.callable = self.load()
flask        |   File "/usr/local/lib/python3.6/site-packages/gunicorn/app/wsgiapp.py", line 65, in load
flask        |     return self.load_wsgiapp()
flask        |   File "/usr/local/lib/python3.6/site-packages/gunicorn/app/wsgiapp.py", line 52, in load_wsgiapp
flask        |     return util.import_app(self.app_uri)
flask        |   File "/usr/local/lib/python3.6/site-packages/gunicorn/util.py", line 352, in import_app
flask        |     __import__(module)
flask        | ModuleNotFoundError: No module named 'wsgi'
flask        | [2020-03-09 15:00:11 +0000] [8] [INFO] Worker exiting (pid: 8)
flask        | [2020-03-09 15:00:11 +0000] [9] [INFO] Booting worker with pid: 9
flask        | [2020-03-09 15:00:11 +0000] [9] [ERROR] Exception in worker process
flask        | Traceback (most recent call last):
flask        |   File "/usr/local/lib/python3.6/site-packages/gunicorn/arbiter.py", line 578, in spawn_worker
flask        |     worker.init_process()
flask        |   File "/usr/local/lib/python3.6/site-packages/gunicorn/workers/base.py", line 126, in init_process
flask        |     self.load_wsgi()
flask        |   File "/usr/local/lib/python3.6/site-packages/gunicorn/workers/base.py", line 135, in load_wsgi
flask        |     self.wsgi = self.app.wsgi()
flask        |   File "/usr/local/lib/python3.6/site-packages/gunicorn/app/base.py", line 67, in wsgi
flask        |     self.callable = self.load()
flask        |   File "/usr/local/lib/python3.6/site-packages/gunicorn/app/wsgiapp.py", line 65, in load
flask        |     return self.load_wsgiapp()
flask        |   File "/usr/local/lib/python3.6/site-packages/gunicorn/app/wsgiapp.py", line 52, in load_wsgiapp
flask        |     return util.import_app(self.app_uri)
flask        |   File "/usr/local/lib/python3.6/site-packages/gunicorn/util.py", line 352, in import_app
flask        |     __import__(module)
flask        | ModuleNotFoundError: No module named 'wsgi'
flask        | [2020-03-09 15:00:11 +0000] [9] [INFO] Worker exiting (pid: 9)
flask        | [2020-03-09 15:00:11 +0000] [1] [INFO] Shutting down: Master
flask        | [2020-03-09 15:00:11 +0000] [1] [INFO] Reason: Worker failed to boot.

所以意味着我的 Flask 服务构建失败，因此 Nginx 代理的应用程序服务器没有运行，根据这个 answer .但我不知道哪里出了问题。

这是我的docker-compose.yml :

  version: '3'
  services:

  flask:
    build:
      context: app
      dockerfile: Dockerfile
    container_name: flask
    image: digitalocean.com/flask-python:3.6
    restart: unless-stopped
    environment:
      APP_ENV: "prod"
      APP_DEBUG: "False"
      APP_PORT: 5000  

  service_2: 
     ...

  service_3:
    ...

这是我的app/Dockerfile

FROM python:3.6.8-alpine3.9

WORKDIR /var/www/

ADD . /var/www/
RUN apk add --no-cache build-base libffi-dev openssl-dev ncurses-dev

RUN python -m pip install --upgrade pip
RUN pip install -r requirements.txt // gunicorn is install inside requirements.txt

EXPOSE 5000

CMD [ "gunicorn", "-w", "4", "--bind", "0.0.0.0:5000", "wsgi"]

这是我的项目目录的样子:

home
-project_root
-docker-compose.yml
--app
---all other files
---Dockerfile
---requirements.txt
---wsgi.py

这是我的wsgi.py :

import os
from app import create_app
from flask_cors import CORS

app = create_app()
cors = CORS(app)

if __name__ == '__main__':
    ENVIRONMENT_DEBUG = os.environ.get("APP_DEBUG", True)
    ENVIRONMENT_PORT = os.environ.get("APP_PORT", 5000)
    app.run(host='0.0.0.0', port=ENVIRONMENT_PORT, debug=ENVIRONMENT_DEBUG)

我试过的:

据此answer ，我改了CMD在 app\Dockerfile由此:

CMD [ "gunicorn", "-w", "4", "--bind", "0.0.0.0:5000", "wsgi"]

对此:

CMD [ "gunicorn", "-w", "4", "--bind", "0.0.0.0:5000", "/home/project_root/app/wsgi.py"]

但是在运行 docker-compose up -d 时，我仍然遇到同样的错误。 .我是 docker 的新手，所以完全不知道是什么导致了错误以及我到底做错了什么。有人请帮忙。

更新:

据此answer ，以及下面的答案，我尝试像这样运行命令:

CMD [ "gunicorn", "-w", "4", "--bind", "0.0.0.0:5000", "wsgi:app"]

仍然得到同样的错误。

如果我搬家 wsgi.py外app像这样的文件夹:

home
    -project_root
    -docker-compose.yml
    -wsgi.py
    --app
    ---all other files
    ---Dockerfile
    ---requirements.txt

也有同样的错误。

更新 2:

我改变 CMD 如下:

CMD [ "gunicorn", "-w", "4", "--bind", "0.0.0.0:5000", "/var/www/app/wsgi.py"]

现在我得到这样的错误:

flask        | ModuleNotFoundError: No module named '/var/www/app/wsgi.py'

Answer 1

您可以尝试将您的项目结构变成这样吗

home
    -project_root
    -docker-compose.yml
    -wsgi.py
    -Dockerfile
    -requirements.txt
    --app
    ---all other files

还有你的Dockerfile变成这样

FROM python:3.6.8-alpine3.9

WORKDIR /var/www/

ADD . /var/www/
RUN apk add --no-cache build-base libffi-dev openssl-dev ncurses-dev

RUN python -m pip install --upgrade pip
RUN pip install -r requirements.txt // gunicorn is install inside requirements.txt

EXPOSE 5000

CMD [ "gunicorn", "-w", "4", "--bind", "0.0.0.0:5000", "wsgi:app"]