docker - 避免在每个Docker构建中重新安装软件包

Question

当我构建需要TensorFlow(导入tensorflow)的新python应用程序的镜像时，每次docker安装520 MB的TensorFlow时。

如何避免这种情况？意味着只下载一次tensorflow并在构建许多图像时使用它？

Dockerfile

FROM python:3

WORKDIR /usr/src/app

COPY model.py .
COPY model_08015_07680.h5 .
COPY requirements.txt .
COPY images .
COPY labels.txt .
COPY test_run.py .

RUN pip install --no-cache-dir -r requirements.txt

CMD ["python","./test_run.py"]

requirements.txt

numpy
opencv-python
tensorflow

Answer 1

请使用下面经过优化的Dockerfile，因为它不会一次又一次安装依赖项，直到/除非您更改requirements.txt

FROM python:3

WORKDIR /usr/src/app

#Copy Requirements
COPY requirements.txt .
RUN pip install --no-cache-dir -r requirements.txt

#Copy everything later, as below parts will be changing and above part will be used from cache
COPY model.py .
COPY model_08015_07680.h5 .
COPY images .
COPY labels.txt .
COPY test_run.py .


CMD ["python","./test_run.py"]