docker-compose run without mounting volume

[kevinsimper]

I run tests with docker-compose, but because it mounts the volume inside when you do it, I have to install dependencies again.

What i do to run test locally:
docker-compose run backend npm test

But on CicleCi I build my containers first with docker-compose build and they are completly runable, but docker-compose makes it easier because it starts links at the same time.

So on circleci i have to do
`docker-compose run backend /bin/bash -c "npm installl && npm test"``

which takes longer because i have to do npm install twice.

I want to do

docker-compose run --no-volumes backend npm test

[aanand]

I don't have much experience with Node, but I believe npm will climb through parent directories until it finds a node_modules directory, so in your Dockerfile, after running npm install, you could move node_modules to the parent directory.

[kevinsimper]

@aanand Node.js was just an example, there could be cases where you want to run a one-off container and not have any side-effects.

[iandyh]

@kevinsimper Isn't the opposite case? You want the volume to be mounted inside container and after first run you will have the dependencies there and no need to install again.

So what I am finding now is that after first docker-compose run web mvn test, the mounted directory /root/.m2/repository is empty so the next run still requires to download all the dependencies.

Of course, mvn(maven) and npm are similar here.

[dnephin]

This can now be solved with #2051 (in the 1.5.0 release).

You can override volumes to add them or remove them for different environments.

[callumgare]

I believe this issue should be reopened since despite the name it is not actually possible to override values like volumes #3729. You can add new volumes but not cancel out existing ones.

[SimonPixaera]

👍 to above comment. I'd also like to see a '--no-volumes' flag for docker-compose up

[dominathan]

Not sure if this helps other people but my work around was to use an anonymous volume for my command which get removed after the container is destroyed.

docker compose run --rm -v='/do/not/mount' -w=/ --no-deps SERVICE_NAME command