symfony docker permission problems for cache files

Question

I have a symfony setup for docker with docker-compose which is working well except when i run cache:clear from console, the webserver cant access the files.

I c

Answer 1

I'd think changing www-datas userid to your host-user's id is a good solution, as permissions for the host user are fairly easy to setup.

#change www-data`s UID inside a Dockerfile
RUN usermod -u [USERID] www-data 

user id 1000 is the default for most linux systems afaik... 501 on mac
you can run id -u on the host system to find out.

You could then log into the container to run symfony commands as www-data

docker exec -it -u www-data [CONTAINER] bash

I was wondering how you could set the userid dynamically on container build. I guess passing it via --build-arg to docker-compose would be the way

docker-compose build --build-arg USERID=$(id -u)

...but haven't managed to access that var in the Dockerfile yet.