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我正在尝试使用多阶段来减小我的 python docker 映像文件的大小。这是我的 Dockerfile。

Dockerfile

FROM ubuntu:18.04 AS builder

WORKDIR /usr/app

RUN apt-get update \
    && apt-get install -y python3-pip python3-dev python3-venv \
    && pip3 install --upgrade pip \
    && python3 -m venv /opt/venv

ENV PATH="/opt/venv/bin:$PATH"

RUN apt-get update && \
    DEBIAN_FRONTEND=noninteractive \
    apt-get -y install \
        build-essential \
        libboost-all-dev \
        cmake \
        clang \
        libcurl4-gnutls-dev \
        curl \
        gnupg2 \
        libssl-dev \
        zlib1g-dev \
        libbz2-dev \
        libreadline-dev \
        libsqlite3-dev \
        llvm \
        libncurses5-dev \
        libncursesw5-dev \
        xz-utils \
        tk-dev \
        libffi-dev \
        git \
        wget \
        ssh \
        libgcrypt-dev \
        gnutls-dev

ENV CC /usr/bin/clang
ENV CXX /usr/bin/clang++

ARG key
RUN mkdir ~/.ssh && echo "Host github.com\n IdentityFile ~/.ssh/id_rsa\n IdentitiesOnly yes" > ~/.ssh/config && \
    echo "$key" > ~/.ssh/id_rsa && \
    chmod 0600 ~/.ssh/id_rsa && \
    ssh-keyscan github.com >> ~/.ssh/known_hosts

COPY requirements.txt .
RUN pip install -r requirements.txt

FROM python:3.7.3-slim

COPY --from=builder /opt/venv /opt/venv
ENV PYTHONPATH="/opt/venv/lib"
ENV PATH="/opt/venv/bin:$PATH"

WORKDIR /usr/app
COPY . .
RUN ./test.sh && rm -rf test*
USER 10001
CMD PYTHONPATH="${PYTHONPATH}:$(pwd)" python prediction_engine/process.py

在第一阶段which python输出/opt/venv/bin/python 当它到达第二阶段which python输出时/usr/local/bin/python

在第一阶段为 virtualenv 定义的符号链接没有被正确复制。谁能帮我弄清楚原因。

我确实尝试在第一阶段使用 python:3.6-jessie AS builder，以便两个阶段都使用 python 图像，但是该图像中缺少许多库，并且一些 python 库需要 c++17 来编译。这是最理想的设置，但 virtualenv 在第二阶段不起作用

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