如何合并Docker的图像层并缩小图像文件

Docker图片检查< name>
给我16GB

约20层

当我以root身份登录时,此
du -hs /
给我看看2GB

仅供参考,Dockerfile中已经有非常多行的RUN命令.

是否可以在不触摸Dockerfile,重建等的情况下将所有层压缩为一层？

或者可能通过向Dockerfile添加额外的操作来清除/改善缓存

Dockerfile是

FROM heroku/heroku:18

ENV PYENV_ROOT="/pyenv"
ENV PATH="/pyenv/shims:/pyenv/bin:$PATH"
ENV PYTHON_VERSION 3.5.6
ENV GPG_KEY <value>
ENV PYTHONUNBUFFERED 1
ENV TERM xterm
ENV EDITOR vim

RUN apt-get update && apt-get install -y 
    build-essential 
    gdal-bin 
    binutils 
    iputils-ping 
    libjpeg8 
    libproj-dev 
    libjpeg8-dev 
    libtiff-dev 
    zlib1g-dev 
    libfreetype6-dev 
    liblcms2-dev 
    libxml2-dev 
    libxslt1-dev 
    libssl-dev 
    libncurses5-dev 
    virtualenv 
    python-pip 
    python3-pip 
    python-dev 
    libmysqlclient-dev 
    mysql-client-5.7 
    libpq-dev 
    libcurl4-gnutls-dev 
    libgnutls28-dev 
    libbz2-dev 
    tig 
    git 
    vim 
    nano 
    tmux 
    tmuxinator 
    fish 
    sudo 
    libnet-ifconfig-wrapper-perl 
    ruby 
    libssl-dev 
    nodejs 
    strace 
    tcpdump 
    # npm & grunt
    && curl -L https://npmjs.com/install.sh | sh 
    && npm install -g grunt-cli grunt 
    # ruby & foreman
    && gem install foreman 
    # installing pyenv
    && curl https://raw.githubusercontent.com/yyuu/pyenv-installer/master/bin/pyenv-installer | bash

COPY . /app
COPY ./requirements /requirements
COPY ./requirements.txt /requirements.txt
COPY ./docker/docker_compose/django/foreman.sh /foreman.sh
COPY ./docker/docker_compose/django/Procfile /Procfile
COPY ./docker/docker_compose/django/entrypoint.sh /entrypoint.sh

# ADD sudoer user django with password django
RUN groupadd -r django -g 1000 && 
    useradd -ms /usr/bin/fish -p $(openssl passwd -1 django) --uid 1000 --gid 1000 -r -g django django && 
    usermod -a -G sudo django && 
    chown -R django:django /app 

COPY --chown=django:django ./docker/docker_compose/django/fish /home/django/.config/fish
COPY --chown=django:django ./docker/docker_compose/django/tmuxinator /home/django/.tmuxinator
COPY ./docker/docker_compose/django/fish /root/.config/fish

WORKDIR /app

RUN sed -i 's/r//' /entrypoint.sh 
    && sed -i 's/r//' /foreman.sh 
    && chmod +x /entrypoint.sh 
    && chown django /entrypoint.sh 
    && chmod +x /foreman.sh 
    && chown django /foreman.sh 
    && chown -R django:django /home/django/ 
    && pyenv install ${PYTHON_VERSION%%} 
    && mkdir -p /app/log 
    && pyenv global ${PYTHON_VERSION%%} 
    && pyenv rehash 
    && ${PYENV_ROOT%%}/versions/${PYTHON_VERSION%%}/bin/pip install -U pip 
    && ${PYENV_ROOT%%}/versions/${PYTHON_VERSION%%}/bin/pip install -r /requirements.txt 
    && chown -R django:django /pyenv/ 
    && ${PYENV_ROOT%%}/versions/${PYTHON_VERSION%%}/bin/pip install -r /requirements/dev_requirements.txt

# this user receives ENVs from the top
USER django

ENTRYPOINT ["/entrypoint.sh"]

到目前为止,我已经尝试过：

来自docker build实验模式的–squash选项对我来说不是.该Dockerfile是docker-compose中的其他Dockerfile之一.

我也检查了一下：
https://github.com/jwilder/docker-squash

但似乎docker load无法加载压缩的图像.
另外,壁球给了我8GB(距离预期的2GB距离还很远)

docker save <image_id> | docker-squash -t latest_tiny | docker load

回答后更新：

当我添加了这个：

&& apt-get autoremove              # ? to consider
&& apt-get clean                   # ? to consider
&& rm -rf /var/lib/apt/lists/*

apt-get和–no-cache-dir到每个pip,结果是72GB(是的,甚至更多-docker图像在pip命令之前显示36GB,最终大小为72GB).

我的工作目录是明确的(关于COPY). du -hs /(作为root用户)仍然有2GB.并在重建之前删除了所有图像.

遵循@Mihai方法,我能够将映像从16GB缩小到9GB.