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ラズパイのDockerでpip install cryptographyが失敗する

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問題

pip install cryptographyが失敗する。
cryptographypoetryの依存ライブラリ。
imageはpython:3.9-slim-buster

解決策

cryptographyがRUSTコンパイラを使用しないバージョンを指定する。かつ依存ライブラリをaptでインストール。
環境変数 CRYPTOGRAPHY_DONT_BUILD_RUSTに何でも良いので値をセットするとRUSTコンパイラを使わなくなる。

Dockerfile

poetryを使ってPythonアプリを動かす例。

FROM python:3.9-slim-buster

ENV PYTHONUNBUFFERED 1
ENV CRYPTOGRAPHY_DONT_BUILD_RUST 1

WORKDIR /src

RUN apt update && apt install --no-install-recommends -y build-essential libffi-dev ca-certificates
python-cffi libssl-dev
RUN pip install cryptography==3.4.1
RUN pip install poetry
RUN mkdir /src/logs


COPY pyproject.toml* poetry.lock* ./
COPY app /src/app
COPY log_conf.yml ./
COPY env.sh ./


RUN poetry config virtualenvs.in-project true
RUN if [ -f pyproject.toml ]; then poetry install; fi

CMD ["poetry", "run", "uvicorn", "app.main:app", "--host", "0.0.0.0", "--port", "80", "--reload", "-
-log-config", "log_conf.yml"]
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