我在 Docker 容器中开发了一个 Flask 应用程序。我的代码的最小示例具有以下结构:
+- myproject
+- Flask-App
+- src
+- __init__.py
+-__init__.py
+- Dockerfile
+- requirements.txt
+- wsgi.py
+- docker-compose.yml
I made the example even more minimalistic (see second edit)
由于我目前正在开发应用程序,因此我想将 src
作为卷添加到我的容器中。如果不安装卷,我每次都必须重建容器。每当我添加音量时,都会引发此错误:
Attaching to flask
flask | Traceback (most recent call last):
flask | File "wsgi.py", line 1, in <module>
flask | from src import create_app
flask | ImportError: cannot import name 'create_app' from 'src' (unknown location)
flask exited with code 1
如果没有 docker-compose.yml
中的 volume
命令,代码也会运行。您能解释一下我如何避免这个问题吗?
docker-compose.yml
version: '3.1'
services:
flask:
build:
context: ./Flask-App
dockerfile: Dockerfile
container_name: flask
ports:
- "5000:5000"
volumes: # produces error
- ./src/:/home/appuser/src/ # produces error
Flask-App/wsgi.py
from src import create_app
app = create_app()
if __name__ == '__main__':
app.run(host='0.0.0.0', port=5000)
Flask-App/requirements.txt
Flask==1.1.1
Flask 应用程序/Dockerfile
FROM python:3.7.3-stretch
COPY ./requirements.txt /tmp/
RUN pip install -r /tmp/requirements.txt
RUN useradd --home /home/appuser appuser
WORKDIR /home/appuser
USER appuser
COPY ./ ./
# Run the application
ENTRYPOINT ["python"]
CMD ["wsgi.py"]
Flask-App/src/__init__.py
from flask import Flask
def create_app():
app = Flask(__name__)
@app.route('/')
def index():
return "Hello World"
return app
编辑1
Flask 应用程序/Dockerfile
FROM python:3.7.3-stretch
COPY ./requirements.txt /tmp/
RUN pip install -r /tmp/requirements.txt
RUN useradd --home /home/appuser appuser
WORKDIR /home/appuser
USER appuser
COPY ./ ./
RUN echo $(ls -alt /home/appuser) # newly added
# Run the application
ENTRYPOINT ["python"]
CMD ["wsgi.py"]
echo ls
的输出
total 24
drwxr-xr-x 1 root root 4096 Oct 22 11:55 .
-rwxr-xr-x 1 root root 345 Oct 22 11:55 Dockerfile
-rwxr-xr-x 1 root root 117 Oct 22 11:25 wsgi.py
-rwxr-xr-x 1 root root 0 Oct 22 11:17 __init__.py
drwxr-xr-x 2 root root 4096 Oct 22 11:17 src
drwxr-xr-x 1 root root 4096 Oct 21 11:15 ..
-rwxr-xr-x 1 root root 12 Oct 21 11:14 requirements.txt
编辑2
好吧,我让它变得更加简约。这个例子根本不需要 Flask。当我安装卷时,程序再次引发错误
flask_1 | Traceback (most recent call last):
flask_1 | File "app.py", line 1, in <module>
flask_1 | from src import create_app
flask_1 | ImportError: cannot import name 'create_app' from 'src' (unknown location)
下面,我再次添加了所有文件以重现错误。
docker-compose.yml
version: '3'
services:
flask:
build:
context: ./Flask-App
volumes:
- ./Flask-App/src:/usr/src/app/sr
Flask-App/src/__init__.py
class MyTest:
def my_print_fnc(self):
print("Hello World")
def create_app():
return MyTest()
Flask-App/app.py(替换wsgi.py
)
from src import create_app
app = create_app()
if __name__ == '__main__':
app.my_print_fnc()
Flask 应用程序/Dockerfile
FROM python:3.7.3-stretch
COPY . /usr/src/app
WORKDIR /usr/src/app
# Run the application
ENTRYPOINT ["python", "app.py"]
docker-compose.yml
version: '3'
services:
flask:
build:
context: ./Flask-App
volumes:
- ./Flask-App/src:/usr/src/app/src
最佳答案
我终于找到了我的代码的问题。它位于 Flask-App/Dockerfile 中。复制命令不考虑WORKDIR。
Flask 应用程序/Dockerfile
FROM python:3.7.3-stretch
COPY ./requirements.txt /tmp/
RUN pip install -r /tmp/requirements.txt
RUN useradd --home /home/appuser appuser
WORKDIR /home/appuser
USER appuser
COPY . /home/appuser # <- specify the absolute path
# Run the application
ENTRYPOINT ["python"]
CMD ["wsgi.py"]
docker-compose.yml
version: '3.1'
services:
flask:
build:
context: ./Flask-App
dockerfile: Dockerfile
container_name: flask
ports:
- "5000:5000"
volumes:
- "./Flask-App/src/:/home/appuser/src"
关于python - 如何在docker中正确挂载代码进行开发,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/58503308/