【发布时间】：2022-01-04 15:09:21
【问题描述】：
Docker Compose 给出ModuleNotFoundError: No module named 'django' 错误。 Docker Compose 没有安装我的 pip 安装包pip install -r requirements.txt，但以任何其他方式运行映像显示它们已安装，这个问题仅与 docker-compose 有关，为什么？
撰写
version: '3.8'
services:
web:
build: ./
user: python
volumes:
- ./:/app
ports:
- 8000:8000
env_file:
- ./.env.dev
Dockerfile
# 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
问题：
我创建了以下 Dockerfile，它在生产中运行，甚至在 docker-compose 之外本地运行，没有任何问题，即以下工作没有错误docker run -p 8000:8000 web/lastest。
但是，当我通过 docker-compose 运行它时，它找不到我安装的 pip 包。
例如：
- docker-compose 构建（成功）
- 码头工人组成
错误
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'
在直接运行映像和使用 docker-compose 时运行 which python 输出 /usr/local/bin/python。
正在运行docker run -it 43d991d65c02 /bin/bash 我可以看到并运行 Django。只有运行docker-compose时没有安装Django，为什么？
【问题讨论】：
-
您在运行时使用卷挂载覆盖容器中的
/app目录。 -
好吧，我太傻了。我不知道卷会清除 docker OS 系统中已安装的软件包。很高兴除非你回答
-
在 requirements.txt 中不应该是
Django吗？ -
这取决于软件包的安装位置。如果我们通过卷挂载来挂载目录，则配置的容器目录是“覆盖”的。如果这个容器目录包含已安装的模块，那么是的，它们已经消失了。您能否检查 a) 删除卷挂载或 b) 在容器启动时重新运行
pip install -r requirements.txt是否可以解决问题？ -
感谢@Turing85，当我删除卷时，这现在可以工作了。我只想在本地进行更改并更新正在运行的容器。我想我误解了它的作用
标签： python docker docker-compose