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I am trying to setup a python virtual environment on a docker image running a docker build

The terminal output is ok when I run docker build .. but when I login into my container, no packages are installer in my virtual environment.

#Dockerfile RUN curl https://bootstrap.pypa.io/get-pip.py -o get-pip.py RUN python3.8 get-pip.py RUN pip install virtualenv RUN virtualenv venv RUN /home/ubuntu/venv/bin/pip install -r auto/requirements.txt ... 
# Docker build command docker build --no-cache -t auto-server:1.0 . 
# Terminal output Step 27/27 : RUN /home/ubuntu/venv/bin/pip install -r auto/requirements.txt ---> Running in d27dbb9a4c97 Collecting asgiref==3.2.10 Downloading asgiref-3.2.10-py3-none-any.whl (19 kB) Collecting beautifulsoup4==4.9.1 Downloading beautifulsoup4-4.9.1-py3-none-any.whl (115 kB) Collecting Django==3.1.1 Downloading Django-3.1.1-py3-none-any.whl (7.8 MB) ... Successfully installed Django-3.1.1 asgiref-3.2.10 beautifulsoup4-4.9.1 fake-useragent-0.1.11 joblib-0.16.0 numpy-1.19.2 pandas-1.1.2 python-dateutil-2.8.1 pytz-2020.1 scikit-learn-0.23.2 scipy-1.5.2 six-1.15.0 sklearn-0.0 soupsieve-2.0.1 sqlparse-0.3.1 threadpoolctl-2.1.0

Here is what I get when I list pakages in my virtual environment:

$ docker exec -ti auto-server bash root@9c1f914d1b7b:/home/ubuntu# source venv/bin/activate (venv) root@9c1f914d1b7b:/home/ubuntu# pip list Package Version ---------- ------- pip 20.2.2 setuptools 49.6.0 wheel 0.35.1 WARNING: You are using pip version 20.2.2; however, version 20.2.3 is available. You should consider upgrading via the '/home/ubuntu/venv/bin/python -m pip install --upgrade pip' command.

Is it the right way to do it? How to make sure packages will be installed?

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6
  • you should upgrade pip first: /home/ubuntu/venv/bin/python -m pip install pip --upgrade (as the message suggests). Commented Sep 30, 2020 at 7:08
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    Do you have a specific need for a virtualenv in the container? If you don't, don't create one - the container environment is isolated from the outside world anyway. Commented Sep 30, 2020 at 7:12
  • my idea is to have a dev environment in a container with the possibility to deploy it easily. Commented Sep 30, 2020 at 7:22
  • Please don't post images with text. See also meta.stackoverflow.com/questions/303812/… Commented Sep 30, 2020 at 8:43
  • 1
    I believe an answer can be found in the thread of this question: stackoverflow.com/questions/48561981/… Commented Sep 30, 2020 at 9:12

2 Answers 2

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Finally having a virtual environment is not mandatory in a container development environment, I just setup image python environment as desired.

# Dockerfile ... RUN python3.8 get-pip.py RUN pip install -r auto/requirements.txt

This is not exactly what I was looking for but it does the job.

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1 Comment

a virtualenv in a container is still a good idea in some cases: isolating yourself from OS-level system packages (many parts of modern operating systems are implemented in python, especially ubuntu) and avoiding breaking the OS-level functionality
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I use simple Dockerfile for dev mode

# pull official base image FROM python:3.6-alpine # set work directory WORKDIR /usr/src/app # set environment variables ENV PYTHONDONTWRITEBYTECODE 1 ENV PYTHONUNBUFFERED 1 # install psycopg2 dependencies RUN apk update \ && apk add postgresql-dev gcc python3-dev # install dependencies RUN pip install --upgrade pip COPY ./requirements.txt . RUN pip install -r requirements.txt # copy project COPY . .
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3 Comments

thanks but I cannot start from python:3.6-alpine image
Does this mean the pip is run as root in the container? I always get warning from pip saying it is not agood practice to run pip as root.
@doraemon Yes. By default you have root rights while building an image. This makes sense as it simplifies installing/configuring things. You can safely ignore pip's complaint.

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