Optimize Docker Size Image with Python Environment
I am a software engineer with 4 years of professional experience, currently specializing in full-stack development.
I work a lot with HTML, CSS, JavaScript, and Python and regularly use React, Vue, and Django to build single-page applications and marketing landing pages.
I also work with React Native to build mobile applications with optimized experiences and for businesses who want to ship products in the market quickly.
Currently, I am a part of a team of 8 as a full-stack engineer where I focus on accessibility, component-driven approaches, and building systems that can scale with ease.
Building Docker image with Python can be well quite heavy.
For a multistage build for example, instead of building wheels at each, you can specify a path for the python environment once it's initialized at the first stage of the build.
ENV PATH="/opt/venv/bin:$PATH"
Make sure you have created the virtual environment tho.👀
RUN python -m venv /opt/venv
ENV PATH="/opt/venv/bin:$PATH"
Here's an example with two steps:
# first stage
FROM python:3.10-slim as builder
WORKDIR /app
ENV PYTHONDONTWRITEBYTECODE 1
ENV PYTHONUNBUFFERED 1
RUN pip install virtualenv
RUN virtualenv /opt/venv
ENV PATH="/opt/venv/bin:$PATH"
COPY requirements.txt .
RUN pip install -r requirements.txt
# another stage
FROM python:3.10-slim
COPY --from=builder /opt/venv /opt/venv
WORKDIR /app
ENV PATH="/opt/venv/bin:$PATH"
Summary
In conclusion, here are the steps again 🚀:
- Create the virtual environment in the builder image
- Copy the virtual environment to the final image
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