在通过dockerfile建立码头图像时,可以通过cmd行传递ENV变量吗? [英] Can we pass ENV variables through cmd line while building a docker image through dockerfile?
问题描述
我正在开展一项任务,涉及使用 Dockerfile ,以 centos 为基础构建码头图像。 docker文件中的一个步骤需要设置 http_proxy 和 https_proxy ENV变量,以便在代理服务器后工作。
I am working on a task that involves building a docker image with centOs as its base using a Dockerfile . One of the steps inside the dockerfile needs http_proxy and https_proxy ENV variables to be set in order to work behind the proxy.
由于这个Docker文件将被具有不同代理的多个团队使用,我想避免为每个团队编辑Dockerfile。相反,我正在寻找一个解决方案,允许我在构建时传递ENV变量,例如
As this Dockerfile will be used by multiple teams having different proxies, I want to avoid having to edit the Dockerfile for each team. Instead I am looking for a solution which allows me to pass ENV variables at build time, e.g.,
sudo docker build -e http_proxy = somevalue
sudo docker build -e http_proxy=somevalue .
我不知道是否有提供此选项。我错过了什么吗?
I'm not sure if there is already an option that provides this. Am I missing something?
推荐答案
容器可以使用构建参数
(在Docker 1.9+ )它像环境变量一样工作。
Containers can be built using build arguments
(in Docker 1.9+) which work like environment variables.
这是一种方法:
FROM php:7.0-fpm
ARG APP_ENV=local
ENV APP_ENV ${APP_ENV}
RUN cd /usr/local/etc/php && ln -sf php.ini-${APP_ENV} php.ini
然后构建一个生产容器:
and then build a production container:
docker build --build-arg APP_ENV = prod。
对于您的特定问题:
FROM debian
ENV http_proxy ${http_proxy}
然后运行:
docker build --build-arg http_proxy = 10.11.24.31。
请注意,如果您使用 docker-撰写
,您可以将这些构建参数指定在 docker-compose.yml
文件,但不在命令行上。但是,您可以在 docker中使用变量替换 - compose.yml
文件,它使用环境变量。
Note that if you build your containers with docker-compose
, you can specify these build-args in the docker-compose.yml
file, but not on the command-line. However, you can use variable substitution in the docker-compose.yml
file, which uses environment variables.
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