使用docker版本1.9.0
我有一个提供 ubuntu 信任镜像 (trusty-mirror) 的 docker 容器。我正在尝试构建第二个容器，并希望它从 trusty-mirror 更新和安装软件包。
我的第二个容器的 Dockerfile 有；
FROM ubuntu:14.04
RUN sed -i -e s#http://archive.ubuntu.com#${MIRROR}#g \
-e s#http://security.ubuntu.com#${MIRROR}#g \
/etc/apt/sources.list
RUN cat /etc/apt/sources.list
RUN apt-get update
RUN apt-get -y upgrade
RUN apt-get -y autoremove
我使用以下方式将 MIRROR 信息传递给 docker build--build-arg 选项，就像这样；
ip=$(docker inspect --format '{{ .NetworkSettings.IPAddress }}' trusty-mirror 2>/dev/null)
docker build --build-arg MIRROR=ftp://$ip
当其运行时；
+++ docker inspect --format '{{ .NetworkSettings.IPAddress }}' trusty-mirror
++ ip=172.17.0.2
++ docker build --build-arg MIRROR=ftp://172.17.0.2 .
Sending build context to Docker daemon 8.192 kB
Step 1 : FROM ubuntu:14.04
---> e9ae3c220b23
Step 2 : RUN sed -i -e s#http://archive.ubuntu.com#${MIRROR}#g -e s#http://security.ubuntu.com#${MIRROR}#g /etc/apt/sources.list
---> Using cache
---> 76f727c60ef8
Step 3 : RUN cat /etc/apt/sources.list
---> Running in 55ff5ff46467
# See http://help.ubuntu.com/community/UpgradeNotes for how to upgrade to
# newer versions of the distribution.
deb /ubuntu/ trusty main restricted
deb-src /ubuntu/ trusty main restricted
## Major bug fix updates produced after the final release of the
## distribution.
deb /ubuntu/ trusty-updates main restricted
deb-src /ubuntu/ trusty-updates main restricted
## Uncomment the following two lines to add software from the 'universe'
## repository.
## N.B. software from this repository is ENTIRELY UNSUPPORTED by the Ubuntu
## team. Also, please note that software in universe WILL NOT receive any
## review or updates from the Ubuntu security team.
deb /ubuntu/ trusty universe
deb-src /ubuntu/ trusty universe
deb /ubuntu/ trusty-updates universe
deb-src /ubuntu/ trusty-updates universe
## N.B. software from this repository may not have been tested as
## extensively as that contained in the main release, although it includes
## newer versions of some applications which may provide useful features.
## Also, please note that software in backports WILL NOT receive any review
## or updates from the Ubuntu security team.
# deb /ubuntu/ trusty-backports main restricted
# deb-src /ubuntu/ trusty-backports main restricted
deb /ubuntu/ trusty-security main restricted
deb-src /ubuntu/ trusty-security main restricted
deb /ubuntu/ trusty-security universe
deb-src /ubuntu/ trusty-security universe
# deb /ubuntu/ trusty-security multiverse
# deb-src /ubuntu/ trusty-security multiverse
---> b296354b0b9e
Removing intermediate container 55ff5ff46467
Step 5 : RUN apt-get update
---> Running in 7251e0ffb6d2
E: Malformed line 4 in source list /etc/apt/sources.list (URI parse)
E: The list of sources could not be read.
请注意，build-arg MIRROR 扩展为“”，这会破坏 /etc/apt sources.list 并导致更新失败。
我已经使用 Dockerfile 中的硬编码值仔细检查了 Dockerfile；
ENV MIRROR=ftp://172.17.0.2
并且一切都按预期运行，除了 docker build 失败；
One or more build-args [MIRROR] were not consumed, failing build.
我在这里遗漏了什么？
答案1
我忽略了 Dockerfile 需要相应的阿根廷入口。