在多阶段Dockerfile中共享变量:未替换FROM之前的ARG [英] Share variable in multi-stage Dockerfile: ARG before FROM not substituted
问题描述
我正在为 darshan utils 编写多阶段Dockerfile.:
I'm writing a multi-stage Dockerfile for the darshan utils:
ARG DARSHAN_VER=3.1.6
FROM fedora:29 as build
RUN dnf install -y \
gcc \
make \
bzip2 bzip2-devel zlib zlib-devel
RUN curl -O "ftp://ftp.mcs.anl.gov/pub/darshan/releases/darshan-${DARSHAN_VER}.tar.gz" \
&& tar ...
FROM fedora:29
COPY --from=build "/usr/local/darshan-${DARSHAN_VER}" "/usr/local/darshan-${DARSHAN_VER}"
...
我使用 docker build -t darshan-util:3.6.1.
构建它,得到的错误是:
I build it with docker build -t darshan-util:3.6.1 .
and the error I get is:
Step 5/10 : RUN curl -O "ftp://ftp.mcs.anl.gov/pub/darshan/releases/darshan-${DARSHAN_VER}.tar.gz" && tar ...
---> Running in 9943cce1669c
% Total % Received % Xferd Average Speed Time Time Time Current
...
curl: (78) RETR response: 550
The command '/bin/sh -c curl -O "ftp://ftp.mcs.anl.gov/pub/darshan/releases/darshan-${DARSHAN_VER}.tar.gz" && tar ...' returned a non-zero code: 78
我想在两个阶段中重用相同的ARG,这样我就可以一次定义一个默认的构建变量.如果我在两个阶段中都在两个FROM的正下方复制ARG,则会正确构建.
I'd like to reuse the same ARG in both stages, so that I can define a default build variable just once. If I duplicate ARG in both stages, just below the two FROMs, it builds correctly.
使用默认值定义全局"多阶段ARG变量的正确方法是什么?
What is the correct way to define a "global" multi-stage ARG variable with a default?
推荐答案
ARG仅在单个图像的构建阶段持续.对于多阶段,只需说明以下内容即可更新ARG:
ARGs only last for the build phase of a single image. For the multistage, renew the ARG by simply stating:
ARG DARSHAN_VER
在您的FROM指示之后.
after your FROM instructions.
cf. https://docs.docker.com/engine/reference/builder/#arg
ARG DARSHAN_VER=3.1.6
FROM fedora:29 as build
ARG DARSHAN_VER
RUN dnf install -y \
gcc \
make \
bzip2 bzip2-devel zlib zlib-devel
RUN curl -O "ftp://ftp.mcs.anl.gov/pub/darshan/releases/darshan-${DARSHAN_VER}.tar.gz" \
&& tar ...
FROM fedora:29
ARG DARSHAN_VER
COPY --from=build "/usr/local/darshan-${DARSHAN_VER}" "/usr/local/darshan-${DARSHAN_VER}"
...
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