多阶段 docker 构建，防止特定阶段的并发

Question

在 docker 多阶段构建中，如何防止其他阶段运行与特定阶段并行？

我有一个多级 Dockerfile。其中一个阶段构建 opencv 堆栈。

FROM node:12.22.1 AS client_build
COPY client/package*.json .
RUN npm install
RUN npm run build

FROM pkg_builder AS open_cv_builder
ARG PYTHON_VERSION
RUN cd ~ && \
    python${PYTHON_VERSION} -m pip install numpy==1.18.2 && \
    cd ~ && \
    wget -O opencv.zip https://github.com/opencv/opencv/archive/3.4.4.zip && \
    wget -O opencv_contrib.zip https://github.com/opencv/opencv_contrib/archive/3.4.4.zip && \
    unzip opencv.zip && mv opencv-3.4.4 opencv && \
    unzip opencv_contrib.zip && mv opencv_contrib-3.4.4 opencv_contrib && \
    cd opencv && mkdir build && cd build && \
    cmake -D CMAKE_BUILD_TYPE=RELEASE \
        -D CMAKE_INSTALL_PREFIX=/usr/local \
        -D INSTALL_PYTHON_EXAMPLES=ON \
        -D INSTALL_C_EXAMPLES=OFF \
        -D OPENCV_ENABLE_NONFREE=ON \
        -D PYTHON_EXECUTABLE=python${PYTHON_VERSION} \
        -D OPENCV_EXTRA_MODULES_PATH=~/opencv_contrib/modules \
        -D BUILD_EXAMPLES=OFF .. && \
    make -j8 && make install && sh -c 'echo "/usr/local/lib" >> /etc/ld.so.conf.d/opencv.conf' && ldconfig

FROM python_runtime as main
...
COPY --from=client build /dist/* /dist
COPY --from=open_cv_builder /usr/local/python/cv2/python-${PYTHON_VERSION}/cv2.cpython-${PYTHON_VERSION_RAW}m-x86_64-linux-gnu.so /usr/local/lib/python${PYTHON_VERSION}/dist-packages/cv2.so
COPY --from=open_cv_builder /usr/local/python/cv2/python-${PYTHON_VERSION}/cv2.cpython-${PYTHON_VERSION_RAW}m-x86_64-linux-gnu.so /usr/local/lib/python${PYTHON_VERSION}/dist-packages/

此阶段使用所有内核进行构建。

如果其他阶段运行并行，它们会冻结并通常会在命令（wget、apt 等）上超时。

我想在这个阶段运行s 时阻止其他阶段运行ning。

Answer 1

最近在 PR #2049. With docker buildx create 的 buildkit 中添加了并发限制，您可以传递一个包含 max-parallelism 选项的配置文件来限制并发步骤。

多阶段 docker 构建，防止特定阶段的并发

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