How does docker implement multi-container shared directories?

my requirement is that I want to put an image in the host"s fixed directory (it"s up to me to decide exactly where, not docker), and then reference it through docker-compose.yml

suppose

a/docker-compose.yml

b/docker-compose.yml

c/docker-compose.yml

should refer to the picture. I don"t want to map the directory structure in every file. I just want to refer to it through the name of volume. In this way, I can modify the storage path of the picture, and there is no need to modify other files

what can be done now

sudo docker volume create --name=data

version: "2"
volumes:
  data:
    external: true

services:
  test:
    image: alpine
    container_name: c_test
    command: /bin/sh
    tty: true
    volumes:
      - data:/tmp

I can get the image storage path by the name data in docker-compose.yml. The disadvantage is that its path is

/var/lib/docker/volumes/data/_data

is not what I want. I want to customize this storage path

Docker-compose linux

Mar.31,2021

version: '2'
volumes:
  data:
    external: true

services:
  test:
    image: alpine
    container_name: c_test
    command: /bin/sh
    tty: true
    volumes:
      - "${MY_DOCKER_DATA_PATH}":/tmp

this will be stored in the current. / data directory

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