python 应用程序尝试将日志文件写入 docker 中的共享卷时权限被拒绝

Question

我正在尝试使用非 root 用户在 docker 中为运行编写一个简单的 python 应用程序，我想登录日志文件的共享卷。

docker-compose.yml

version: '3.7'

services:
  testapp:
    hostname: pythonapp
    container_name: pythonapp
    build:
      context: .
      dockerfile: Dockerfile
    environment:
      - TZ=Europe/Rome
    ports:
      - "8080:8080"
    volumes:
      - ./log:/home/pythonapp/src/log

docker 构建文件

FROM python:3

# set environment variables
ENV PYTHONDONTWRITEBYTECODE 1
ENV PYTHONUNBUFFERED 1

# Create a user with given UID.
RUN useradd -m -u 5000 pythonapp
USER pythonapp
RUN id

RUN mkdir -p /home/pythonapp/src/log
RUN chown -R pythonapp:pythonapp /home/pythonapp 
WORKDIR /home/pythonapp/src

## copy from host to container files
COPY --chown=pythonapp:pythonapp . .

## install dependencies
RUN pip install --user --upgrade pip
RUN pip install --user -r requirements.txt

CMD ["python", "/home/pythonapp/src/pythonapp.py", "-p", "8080"]

在构建映像之前，我在主机中创建了日志文件夹。

mkdir log
ls -la
>>> drwxrwxr-x 2 tabita tabita 4096 ott  2 19:16 log

setfacl -m u:5000:rwx ./log

ls -la
>>> drwxrwxr-x+ 2 tabita tabita 4096 ott  2 19:16 log

getfacl log/
>>># file: log/
# owner: tabita
# group: tabita
user::rwx
user:5000:rw-
group::rwx
mask::rwx
other::r-x

然后我使用 docker-compose

创建了图像

docker-compose -f docker-compose.yml up --build -v

但是，我在这里遇到错误

pythonapp | /home/pythonapp/src
pythonapp | pythonapp
pythonapp | uid=5000(pythonapp) gid=5000(pythonapp) groups=5000(pythonapp)
pythonapp | Traceback (most recent call last):
pythonapp |   File "/home/pythonapp/src/ssh_honeypot.py", line 28, in <module>
pythonapp |     logging.basicConfig(
pythonapp |   File "/usr/local/lib/python3.9/logging/__init__.py", line 2003, in basicConfig
pythonapp |     h = FileHandler(filename, mode,
pythonapp |   File "/usr/local/lib/python3.9/logging/__init__.py", line 1146, in __init__
pythonapp |     StreamHandler.__init__(self, self._open())
pythonapp |   File "/usr/local/lib/python3.9/logging/__init__.py", line 1175, in _open
pythonapp |     return open(self.baseFilename, self.mode, encoding=self.encoding,
pythonapp | PermissionError: [Errno 13] Permission denied: '/home/pythonapp/src/log/pythonapp.log'
pythonapp exited with code 1

调试中

我试图进入容器并在日志文件夹中创建一个文件。我可以创建一个，但在主机系统中我看不到创建的文件。

你能帮帮我吗？

Answer 1

我已经用这个脚本试过你的文件了：

# pythonapp.py
with open('/home/pythonapp/src/log/test.txt', 'w') as f:
    f.write("Hello world!")

只有当 x 访问权限授予用户 5000 时，它才能很好地工作。

需要此权限才能浏览日志目录。

关于您的输出，目前权限为 rw-

getfacl log/
>>># file: log/
...
user:5000:rw-
...

由于你的程序看起来很准确，你能不能从这里再试一次:

log is under my working directory

为 UID:5000 的用户添加权限：
```
setfacl -m u:5000:rwx log
```

检查权限，需要rwx

I think --tabular is a good option to view ACL permissions

getfacl --tabular log 
# file: log
USER   <myuser>  rwx     
user   5000      rwx     
GROUP  <myuser>  rwx     
mask             rwx     
other            r-x

pythonapp.py log目录下应该可以写：

docker-compose up --build

Step 13/13 : CMD ["python", "/home/pythonapp/src/pythonapp.py", "-p", "8080"]
 ---> Using cache
---> fcd2afb9f961
Successfully built fcd2afb9f961
Successfully tagged so_testapp:latest
Starting pythonapp ... done
Attaching to pythonapp
pythonapp exited with code 0

python 应用程序尝试将日志文件写入 docker 中的共享卷时权限被拒绝

Permission denied when python app tries to write log file into shared volume in docker

python

logging

docker

docker-compose