How to set a path on host for a named volume in docker-compose.yml

Question

Example below creates dbdata named volume and references it inside db service:

version: \'2\'
services:
  db:
    image: mysql
    volumes:         


        

Answer 1

With the local volume driver comes the ability to use arbitrary mounts; by using a bind mount you can achieve exactly this.

For setting up a named volume that gets mounted into /srv/db-data, your docker-compose.yml would look like this:

version: '2'
services:
  db:
    image: mysql
    volumes:
      - dbdata:/var/lib/mysql
volumes:
  dbdata:
    driver: local
    driver_opts:
      type: 'none'
      o: 'bind'
      device: '/srv/db-data'

I have not tested it with the version 2 of the compose file format, but https://docs.docker.com/compose/compose-file/compose-versioning/#version-2 does not indicate, that it should not work.

I've also not tested it on Windows...