Dockerfile-使用目标的哪个选项? [英] Dockerfile - Which option to use the target?

问题描述

我有dockerfile

I have dockerfile

FROM cypress/base:12.1.0 as hlg 
RUN mkdir /app WORKDIR /app COPY . /app 
RUN npm install  
RUN $(npm bin)/cypress verify 
RUN ["npm", "run", "cy:runhlg"]

FROM cypress/base:12.1.0 as tst 
RUN mkdir /app WORKDIR /app COPY . /app 
RUN npm install  
RUN $(npm bin)/cypress verify 
RUN ["npm", "run", "cy:runtst"]

然后我构建它

docker build -t cypress --target tst . 

但是，当我使用目标"tst"运行时，每次运行只需要运行一次.最终两者都运行.

But I need to run only one per run, when I run with the target "tst" it ends up running both.

我试图用"if"来做，但是也没有成功

I tried to do it with "if", but without success too

RUN if [ "$arg" = "hlg" ] ; then echo ["npm", "run", "cy:runhlg"] ; else echo ["npm", "run", "cy:runhlg"]; fi
docker build -t cypress --build-arg hlg .

我可以用其他方式做到吗?

Can I do it the other way?

推荐答案

泊坞窗中的经典构建引擎将按顺序处理多阶段构建，直到完成目标阶段，或者未指定目标最后阶段.因此，第一阶段将始终被构建.

The classic build engine in docker will process a multi-stage build sequentially until completing the target stage, or the final stage is no target is specified. So the first stage would always be built.

如果切换到buildkit，它将Dockerfile处理为依赖关系图，并跳过未使用的阶段.您可以使用以下命令在当前shell中启用buildkit:

If you switch to buildkit, it processes the Dockerfile into a dependency graph and skips unused stages. You can enable buildkit in your current shell with:

export DOCKER_BUILDKIT=1

然后您可以通过启用/etc/docker/daemon.json ( daemon.json 也可以在docker的桌面版本中的首选项菜单之一下设置):

And you can make buildkit the default for all builds in the docker engine by enabling a feature flag in /etc/docker/daemon.json (the daemon.json can also be set in the desktop versions of docker under one of the preferences menus):

{
  "features": {"buildkit": true }
}

要处理 daemon.json 文件，请重新加载Docker引擎，例如 systemctl重新加载docker .

To process the daemon.json file, reload the docker engine, e.g. systemctl reload docker.

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