How to run docker-compose as non root user? - docker-compose

Question

By default docker use a root user in a Dockerfile. If I use a root user (docker default user), I can build flask image with (docker build and docker run) or docker-compose up --build and everything works fine apart from having a warning about Running pip as the 'root' user can result in broken permissions and conflicting behaviour with the system package manager.
To avoid the warning, I then decided to add a non root user in the Dockerfile. The warning disappeared indeed, I can also build flask image with (docker build and docker run) that works fine. But unfortunately it doesn't work anymore with docker-compose up --build
So the question is: how to avoid the warning above and still have docker-compose up --build working fine
Here are my Dockerfile and docker-compose.yml with non root user
FROM python:3.10
RUN useradd -ms /bin/bash myuser
USER myuser
WORKDIR /home/myuser
RUN pip install --upgrade --user pip
COPY --chown=myuser:myuser ./code/* ./
RUN pip install -r requirements.txt --user --no-warn-script-
location
ENV PATH="/home/myuser/.local/bin:${PATH}"
version: '3.9'
services:
flask:
build: .
container_name: flask_container
command: python main.py
# user: 1000:1000
ports:
- 5000:5000
volumes:
- ./code:/home/myuser
After running docker-compose up --build I'm getting the following error(same error when using user: 1000:1000): ModuleNotFoundError: No module named 'flask'
Collecting Flask
Downloading Flask-2.0.3-py3-none-any.whl (95 kB)
━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━ 95.6/95.6 KB 2.1
MB/s eta 0:00:00
Collecting itsdangerous>=2.0
Downloading itsdangerous-2.1.1-py3-none-any.whl (15 kB)
Collecting Werkzeug>=2.0
Downloading Werkzeug-2.0.3-py3-none-any.whl (289 kB)
━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━ 289.2/289.2 KB 4.4
MB/s eta 0:00:00
Collecting Jinja2>=3.0
Downloading Jinja2-3.0.3-py3-none-any.whl (133 kB)
━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━ 133.6/133.6 KB 3.0
MB/s eta 0:00:00
Collecting click>=7.1.2
Downloading click-8.0.4-py3-none-any.whl (97 kB)
━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━ 97.5/97.5 KB 2.7
MB/s eta 0:00:00
Collecting MarkupSafe>=2.0
Downloading MarkupSafe-2.1.1-cp310-cp310-
manylinux_2_17_x86_64.manylinux2014_x86_64.whl (25 kB)
Installing collected packages: Werkzeug, MarkupSafe,
itsdangerous, click, Jinja2, Flask
Successfully installed Flask-2.0.3 Jinja2-3.0.3 MarkupSafe-2.1.1
Werkzeug-2.0.3 click-8.0.4 itsdangerous-2.1.1
Removing intermediate container 79206447dcf5
---> 51797f14d971
Step 8/8 : ENV PATH="/home/myuser/.local/bin:${PATH}"
---> Running in bc4b778bac5d
Removing intermediate container bc4b778bac5d
---> 195f721ef077
Successfully built 195f721ef077
Successfully tagged docker-dev_flask:latest
Creating flask_container ... done
Attaching to flask_container
flask_container | Traceback (most recent call last):
flask_container | File "/home/myuser/main.py", line 1, in
<module>
flask_container | from flask import Flask
flask_container | ModuleNotFoundError: No module named 'flask'
flask_container exited with code 1
But everything works fine when using root user
FROM python:3.10
WORKDIR /code
COPY ./code/* ./
RUN pip install -r requirements.txt
version: '3.9'
services:
flask:
build: .
container_name: flask_container
command: python main.py
ports:
- 5000:5000
volumes:
- ./code:/code
docker-compose up --build doesn't fail but gives a warning about using a root user.
Collecting Flask
Downloading Flask-2.0.3-py3-none-any.whl (95 kB)
━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━ 95.6/95.6 KB 1.8
MB/s eta 0:00:00
Collecting click>=7.1.2
Downloading click-8.0.4-py3-none-any.whl (97 kB)
━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━ 97.5/97.5 KB 1.5
MB/s eta 0:00:00
Collecting Jinja2>=3.0
Downloading Jinja2-3.0.3-py3-none-any.whl (133 kB)
━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━ 133.6/133.6 KB 1.8
MB/s eta 0:00:00
Collecting Werkzeug>=2.0
Downloading Werkzeug-2.0.3-py3-none-any.whl (289 kB)
━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━ 289.2/289.2 KB 1.8
MB/s eta 0:00:00
Collecting itsdangerous>=2.0
Downloading itsdangerous-2.1.1-py3-none-any.whl (15 kB)
Collecting MarkupSafe>=2.0
Downloading MarkupSafe-2.1.1-cp310-cp310-
manylinux_2_17_x86_64.manylinux2014_x86_64.whl (25 kB)
Installing collected packages: Werkzeug, MarkupSafe,
itsdangerous, click, Jinja2, Flask
Successfully installed Flask-2.0.3 Jinja2-3.0.3 MarkupSafe-
2.1.1 Werkzeug-2.0.3 click-8.0.4 itsdangerous-2.1.1
WARNING: Running pip as the 'root' user can result in broken
permissions and conflicting behaviour with the system package
manager. It is recommended to use a virtual environment
instead: https://pip.pypa.io/warnings/venv
Removing intermediate container b9626dc2cd44
---> 42f016cc5667
Successfully built 42f016cc5667
Successfully tagged docker-dev_flask:latest
Creating flask_container ... done
Attaching to flask_container
flask_container | * Serving Flask app 'main' (lazy loading)
flask_container | * Environment: production
flask_container | WARNING: This is a development server. Do
not use it in a production deployment.
flask_container | Use a production WSGI server instead.
flask_container | * Debug mode: off
flask_container | * Running on all addresses.
flask_container | WARNING: This is a development server. Do
not use it in a production deployment.
flask_container | * Running on http://172.18.0.2:5000/ (Press
CTRL+C to quit)
How can I solve this issue ? Thanks for your help