UV Fails to install with Docker

[Nneji123]

I've been using uv with my docker builds for the past few months. I just encountered the following error when trying to install requirements in my container. Here's the error:

 => ERROR [celery-beat stage-0  8/12] RUN --mount=type=cache,target=/root/.cache/pip /root/.cargo/bin/uv pip install --no-cache -r requirements.txt      0.8s
------
 > [celery-beat stage-0  8/12] RUN --mount=type=cache,target=/root/.cache/pip /root/.cargo/bin/uv pip install --no-cache -r requirements.txt:
0.675 error: No Python interpreters found in virtual environments

Here's the Dockerfile:

FROM python:3.8.13-slim-bullseye

WORKDIR /app

# Set environment variables
ENV PYTHONDONTWRITEBYTECODE 1
ENV PYTHONUNBUFFERED 1

RUN apt-get update && \
    apt-get install -y --no-install-recommends \
    netcat \
    wget \
    unzip \
    dpkg && \
    rm -rf /var/lib/apt/lists/*

RUN pip install --upgrade setuptools

ENV VIRTUAL_ENV=/usr/local
ADD --chmod=655 https://astral.sh/uv/install.sh /install.sh
RUN /install.sh && rm /install.sh

ADD requirements.txt /app/requirements.txt

RUN --mount=type=cache,target=/root/.cache/pip /root/.cargo/bin/uv pip install --no-cache -r requirements.txt # the build fails at this stage

# Copy project files into container
ADD . /app

RUN sed -i "s/raise RuntimeError(\"populate() isn't reentrant\")/self.app_configs = {}/g" /usr/local/lib/python3.8/site-packages/django/apps/registry.py

# Copy the entrypoint script
COPY entrypoint.sh /app/entrypoint.sh
RUN chmod +x /app/entrypoint.sh

EXPOSE 8000

ENTRYPOINT ["/app/entrypoint.sh"]

In the Dockerfile I am using the latest version of uv.

How do I go about resolving this issue?

[charliermarsh]

Can you try removing ENV VIRTUAL_ENV=/usr/local, and instead passing --system to your uv pip install invocation?

[Nneji123]

Thank you very much for the quick response. The suggestion you offered fixed the issue.

[zanieb]

Thanks for reporting and checking back in! For additional reference, this is a duplicate of #3765 which has a bit more discussion.