Docker ComposeModuleNotFoundError: No module named 'django'出現錯誤。Docker Compose 尚未安裝我的 pip 安裝包，pip install -r requirements.txt但以任何其他方式運行映像顯示它們已安裝，并且此問題僅與 docker-compose 有關，為什么？
撰寫
version: '3.8'
services:
web:
build: ./
user: python
volumes:
- ./:/app
ports:
- 8000:8000
env_file:
- ./.env.dev
檔案
# Base image
FROM python:3.9.6
ENV HOME=/app
# create directory for the app user
RUN mkdir -p $HOME
# set work directory
WORKDIR $HOME
# install psycopg2 dependencies
RUN apt-get update \
&& apt-get -y install libpq-dev gcc \
&& pip install psycopg2 \
&& apt-get -y install gunicorn3
RUN pip install --upgrade pip
ADD requirements*.txt .
RUN pip install -r requirements.txt
COPY python . .
ENTRYPOINT ["/app/entrypoint.sh"]
EXPOSE 8000
問題：
我創建了以下 Dockerfile，它在生產中運行，甚至在 docker-compose 之外本地運行，沒有任何問題，即以下作業沒有錯誤docker run -p 8000:8000 web/lastest。
但是，當我通過 docker-compose 運行它時，它找不到我安裝的 pip 包。
例如：
- docker-compose 構建（成功）
- 碼頭工人組成
錯誤
web_1 | ImportError: Couldn't import Django. Are you sure it's installed and available on your PYTHONPATH environment variable? Did you forget to activate a virtual environment?
web_1 | [2022-01-04 14:55:05 0000] [1] [INFO] Starting gunicorn 20.1.0
web_1 | [2022-01-04 14:55:05 0000] [1] [INFO] Listening at: http://0.0.0.0:8000 (1)
web_1 | [2022-01-04 14:55:05 0000] [1] [INFO] Using worker: sync
web_1 | [2022-01-04 14:55:05 0000] [8] [INFO] Booting worker with pid: 8
web_1 | [2022-01-04 14:55:05 0000] [8] [ERROR] Exception in worker process
web_1 | Traceback (most recent call last):
web_1 | File "/usr/lib/python3/dist-packages/gunicorn/arbiter.py", line 589, in spawn_worker
web_1 | worker.init_process()
web_1 | File "/usr/lib/python3/dist-packages/gunicorn/workers/base.py", line 134, in init_process
web_1 | self.load_wsgi()
web_1 | File "/usr/lib/python3/dist-packages/gunicorn/workers/base.py", line 146, in load_wsgi
web_1 | self.wsgi = self.app.wsgi()
web_1 | File "/usr/lib/python3/dist-packages/gunicorn/app/base.py", line 67, in wsgi
web_1 | self.callable = self.load()
web_1 | File "/usr/lib/python3/dist-packages/gunicorn/app/wsgiapp.py", line 58, in load
web_1 | return self.load_wsgiapp()
web_1 | File "/usr/lib/python3/dist-packages/gunicorn/app/wsgiapp.py", line 48, in load_wsgiapp
web_1 | return util.import_app(self.app_uri)
web_1 | File "/usr/lib/python3/dist-packages/gunicorn/util.py", line 384, in import_app
web_1 | mod = importlib.import_module(module)
web_1 | File "/usr/lib/python3.9/importlib/__init__.py", line 127, in import_module
web_1 | return _bootstrap._gcd_import(name[level:], package, level)
web_1 | File "<frozen importlib._bootstrap>", line 1030, in _gcd_import
web_1 | File "<frozen importlib._bootstrap>", line 1007, in _find_and_load
web_1 | File "<frozen importlib._bootstrap>", line 986, in _find_and_load_unlocked
web_1 | File "<frozen importlib._bootstrap>", line 680, in _load_unlocked
web_1 | File "<frozen importlib._bootstrap_external>", line 790, in exec_module
web_1 | File "<frozen importlib._bootstrap>", line 228, in _call_with_frames_removed
web_1 | File "/app/app/wsgi.py", line 12, in <module>
web_1 | from django.core.wsgi import get_wsgi_application
web_1 | ModuleNotFoundError: No module named 'django'
在直接運行影像和使用 docker-compose 上運行which python輸出/usr/local/bin/python。
運行docker run -it 43d991d65c02 /bin/bash我可以看到并運行 Django。只有在運行 docker-compose 時才安裝 Django，為什么？
uj5u.com熱心網友回復：
在提供的容器檔案中，我們在容器目錄中作業/app。但是在運行時，我們將卷掛載到/app. 因此，存盤在映像構建期間生成的所有內容/app都被卷掛載覆寫。如果運行時的依賴項安裝在 中/app，則它們會被卷掛載覆寫。
為了解決這個問題，我想到了兩種可能性：
我們可以洗掉卷掛載。然而，這將使我們失去“熱多載”的能力。
pip install -r requirements.txt在啟動應用程式之前，我們可以在容器啟動時重新運行。這意味著將行添加pip install -r requirements.txt到entrypoint.sh-script。
uj5u.com熱心網友回復：
當 docker-compose 將卷掛載到 /app 檔案夾時，其先前的結構將變為隱藏，并且新結構會覆寫先前的結構。
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