问题
我正尝试在使用此Dockerfile的Ruby on Rails项目的docker存储库中使用jessie-backports：
FROM ruby:2.4.1
ENV DEBIAN_FRONTEND noninteractive
ENV DEBCONF_NONINTERACTIVE_SEEN true
RUN echo 'alias ll="ls --color=auto -l"' >> ~/.bashrc
RUN apt-get remove -y python
RUN apt-get update --fix-missing
RUN apt-get -y upgrade
RUN echo "deb http://ftp.debian.org/debian jessie-backports main" >> /etc/apt/sources.list && apt-get update
RUN apt-get install -y certbot -t jessie-backports
但是，当我尝试构建docker镜像时。安装过程中出现以下错误：
E: Release file for http://archive.debian.org/debian/dists/jessie-backports/InRelease is expired (invalid since 77d 3h 49min 17s). Updates for this repository will not be applied.
截至3月27日， Lucas Nussbaum 在此blogpost中写道，将要从Debian镜像中删除jessie-updates和jessie-backports。 我提到的博客文章指出，我需要做的是替换：
deb http://ftp.debian.org/debian jessie-backports main
使用其他命令：
deb http://archive.debian.org/debian/ jessie-backports main contrib non-free
echo 'Acquire::Check-Valid-Until no;' > /etc/apt/apt.conf.d/99no-check-valid-until
所以我将命令更改如下：
FROM ruby:2.4.1
ENV DEBIAN_FRONTEND noninteractive
ENV DEBCONF_NONINTERACTIVE_SEEN true
RUN echo 'alias ll="ls --color=auto -l"' >> ~/.bashrc
RUN apt-get remove -y python
RUN apt-get update --fix-missing
RUN apt-get -y upgrade
RUN echo "deb http://archive.debian.org/debian/ jessie-backports main contrib non-free" > /etc/apt/sources.list
RUN echo 'Acquire::Check-Valid-Until no;' > /etc/apt/apt.conf.d/99no-check-valid-until
RUN apt-get update
但是仍然存在相同的问题。
我还试图将命令移到任何 apt 命令之前，如下所示：
FROM ruby:2.4.1
ENV DEBIAN_FRONTEND noninteractive
ENV DEBCONF_NONINTERACTIVE_SEEN true
RUN echo 'alias ll="ls --color=auto -l"' >> ~/.bashrc
RUN echo "deb http://archive.debian.org/debian/ jessie-backports main contrib non-free" > /etc/apt/sources.list
RUN echo 'Acquire::Check-Valid-Until no;' > /etc/apt/apt.conf.d/99no-check-valid-until
RUN apt-get update
RUN apt-get remove -y python
RUN apt-get update --fix-missing
RUN apt-get -y upgrade