更改 docker 创建的命名卷的权限

Question

I'm attempting to use a docker volume to share data between two containers— where one container will write some data to the volume, and the other will read it.

One of the constraints is that I will need to automate the process using docker-compose— so solutions where a user changes permissions from inside the container will not work

how do i loosen the permissions for a shared volume managed by docker so that a process can write to it?

for additional context: the data being written will be written by postgres, and will be read by a nest js app

Answer 1

For now, my chosen workaround:

shared_volume_setup:
    image: alpine
    volumes:
      - postgres_exports:/tmp/exports
    entrypoint: [ "sh", "-c", "sleep 10 && chmod 777 /tmp/exports"] 

which spins up a different container with the sole purpose of altering the docker-managed volume

I'm still seeking a better answer (using compose config on the volume rather than a separate workload container) but this works fine for now