英文:
Adding a Dockerfile RUN command equivalent to docker-compose file
问题
有没有一种方法可以在Compose文件中添加一个与Dockerfile的RUN命令等效的命令？
背景：
docker-compose.yaml 文件中有一个名为 webapp 的服务，配有一个相应的 Dockerfile (webapp.Dockerfile)。
在开发时，我有一个名为 docker-compose.local.yaml 的文件，它为 webapp 服务添加了一些额外的开发配置，例如：
services:
webapp:
stdin_open: true
tty: true
... # 其他用于我的本地开发需求的内容
我还想运行一些命令到正在构建的镜像中，但我不想将它们放在 webapp.Dockerfile 中的 RUN 命令中。我想以某种方式将它们包含在 docker-compose.local.yaml 中，以便它是我可以追加而不更改基本配置的额外内容。（顺便说一下，我使用 COMPOSE_FILE 环境变量来调用额外的 YAML 文件）。
英文:
Is there a way to add a Dockerfile RUN command equivalent to a compose file?
Context:
docker-compose.yaml has service webapp with an accompanying Dockerfile (webapp.Dockerfile)
When I do development, I have a docker-compose.local.yaml that adds some additional development configurations to webbapp service, e.g.:
services:
webapp:
stdin_open: true
tty: true
... # other stuff for my local development needs
I'd also like to run a couple of commands to the image being built, but I do not want to put it in a RUN command in webapp.Dockerfile. I'd like to somehow include it in docker-compose.local.yaml so that it's something additional I can tack on without changing the base configs. (BTW I invoke the additional YAML file with COMPOSE_FILE environment variable).
答案1
得分: 1
一个 RUN 命令是镜像构建过程的一部分；它只能在 Dockerfile 中使用。如果我想要在我的组合配置中使用的镜像中安装额外的命令，我可以基于旧的镜像构建一个新的镜像。
例如，如果我有一个看起来像这样的 docker-compose.yaml 文件：
services:
web:
image: docker.io/alpinelinux/darkhttpd:latest
并且我真的希望在这个容器内部可用 curl 命令，我可以创建一个像这样的 docker-compose.override.yaml 文件：
services:
web:
build: .
然后，在与 docker-compose.yaml 文件相同的目录中放置一个像这样的 Dockerfile：
services:
web:
image: development
build:
context: .
当运行 docker-compose up 命令时，它将构建自定义镜像并使用它，而不是使用 docker-compose.yaml 中指定的镜像：
$ docker-compose up
Building web
[+] Building 0.1s (6/6) FINISHED
=> [internal] load build definition from Dockerfile 0.1s
=> => transferring dockerfile: 124B 0.0s
=> [internal] load .dockerignore 0.1s
=> => transferring context: 2B 0.0s
=> [internal] load metadata for docker.io/alpinelinux/darkhttpd:latest 0.0s
=> [1/2] FROM docker.io/alpinelinux/darkhttpd:latest 0.0s
=> CACHED [2/2] RUN apk add curl 0.0s
=> exporting to image 0.0s
=> => exporting layers 0.0s
=> => writing image sha256:23e53345322fa1787aa6fd291347732501499f60656805675c6fd4217d040006 0.0s
=> => naming to docker.io/library/development 0.0s
WARNING: Image for service web was built because it did not already exist. To rebuild this image you must use `docker-compose build` or `docker-compose up --build`.
Creating containers_web_1 ... done
Attaching to containers_web_1
web_1 | darkhttpd/1.14, copyright (c) 2003-2022 Emil Mikulic.
英文:
A RUN command is part of the image build process; it can only be used in a Dockerfile. If I want to install additional commands into the image used by my compose configuration, I can build a new image based on the old one.
For example, if I have a docker-compose.yaml that looks like this:
services:
web:
image: docker.io/alpinelinux/darkhttpd:latest
And I really want the curl command to be available inside this container, I can create a docker-compose.override.yaml like this:
services:
web:
build: .
And then put a Dockerfile in the same directory as the docker-compose.yaml that looks like this:
services:
web:
image: development
build:
context: .
And when docker-compose up the environment, it will build the custom image and use that rather than using the image specified in docker-compose.yaml:
$ docker-compose up
Building web
[+] Building 0.1s (6/6) FINISHED
=> [internal] load build definition from Dockerfile 0.1s
=> => transferring dockerfile: 124B 0.0s
=> [internal] load .dockerignore 0.1s
=> => transferring context: 2B 0.0s
=> [internal] load metadata for docker.io/alpinelinux/darkhttpd:latest 0.0s
=> [1/2] FROM docker.io/alpinelinux/darkhttpd:latest 0.0s
=> CACHED [2/2] RUN apk add curl 0.0s
=> exporting to image 0.0s
=> => exporting layers 0.0s
=> => writing image sha256:23e53345322fa1787aa6fd291347732501499f60656805675c6fd4217d040006 0.0s
=> => naming to docker.io/library/development 0.0s
WARNING: Image for service web was built because it did not already exist. To rebuild this image you must use `docker-compose build` or `docker-compose up --build`.
Creating containers_web_1 ... done
Attaching to containers_web_1
web_1 | darkhttpd/1.14, copyright (c) 2003-2022 Emil Mikulic.
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