CODEWITHSUNDEEP
bashubuntudockerdockerfile
eshalev
eshalev

Reputation: 3265

Docker Ubuntu environment variables

During the build stage of my docker images, i would like to set some environment variables automatically for every subsequent "RUN" command.

However, I would like to set these variables from within the docker conatiner, because setting them depends on some internal logic.

Using the dockerfile "ENV" command is not good, because that cannot rely on internal logic. (It cannot rely on a command run inside the docker container)

Normally (if this were not docker) I would set my ~/.profile file. However, docker does not load this file in non-interactive shells.

So at them moment I have to run each docker RUN command with: 

RUN bash -c "source ~/.profile && do_something_here"

However, this is very tedious (and unclean) when I have to repeat this every time I want to run a bash command. Is there some other "profile" file I can use instead.

Upvotes: 1

Views: 4465

Answers (2)

Vignajeth
Vignajeth

Reputation: 708

you can try setting the arg as env like this ARG my_env ENV my_env=${my_env} in Dockerfile, and pass the 'my_env=prod' in build-args so that you can use the set env for subsequent RUN commands you can also use env_file: option in docker compose yml file in case of a stack deploy

Upvotes: 1

Mario F
Mario F

Reputation: 47279

I had a similar problem and couldn't find a satisfactory solution. What I did was creating a script that would source the variables, then do the operation. I would then rewrite the RUN commands in the Dockerfile to use that script instead.

In your case, if you need to run multiple commands, you could create a wrapper that loads the variables, runs the command given as argument, and include that script in the docker image.

Upvotes: 0

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