Docker: how to mount local folder inside container?

Question

I need to share a folder from my OSX machine with a running Docker container, but I can't find how to do it. Here's a working Docker-compose file:

version: '2'
services:
mariadb:
  image: 'bitnami/mariadb:10.3'
  environment:
    - MARIADB_ROOT_PASSWORD=bitnami
    - MARIADB_USER=bn_moodle
    - MARIADB_DATABASE=bitnami_moodle
    - ALLOW_EMPTY_PASSWORD=yes
  volumes:
    - 'mariadb_data:/bitnami'
phpmyadmin:
  image: 'bitnami/phpmyadmin:4'
  ports:
    - '8081:80'
    - '4430:443'
  depends_on:
    - mariadb
  volumes:
    - 'phpmyadmin_data:/bitnami'
moodle:
  image: 'bitnami/moodle:3'
  environment:
    - MARIADB_HOST=mariadb
    - MARIADB_PORT_NUMBER=3306
    - MOODLE_DATABASE_USER=bn_moodle
    - MOODLE_DATABASE_NAME=bitnami_moodle
    - ALLOW_EMPTY_PASSWORD=yes
  ports:
    - '80:80'
    - '443:443'
  volumes:
    - 'moodle_data:/bitnami'
  depends_on:
    - mariadb
volumes:
  mariadb_data:
    driver: local
  phpmyadmin_data:
    driver: local
  moodle_data:
    driver: local

This file correctly starts 3 Docker containers, 1 for Moodle, 1 for MariaDb and 1 for Phpmyadmin.

What I need to do now is to share the content of a local folder with a folder inside the Moodle container. But I can't figure out how to change the Volumes key to reflect that. I tried with a mapping like:

moodle_data:
- moodle_data:/Users/macbook/Code/Php/moodle-docker/moodle/Users/macbook/Code/Php/moodle-docker/moodle

But it didn't work.. what am I doing wrong here? Thanks in advance to anybody who can help!

Answer 1

You need to map your host_folder with your container_folder using host_folder:container_folder. As mentioned on the comments:

moodle:
  image: 'bitnami/moodle:3'
  environment:
    - MARIADB_HOST=mariadb
    - MARIADB_PORT_NUMBER=3306
    - MOODLE_DATABASE_USER=bn_moodle
    - MOODLE_DATABASE_NAME=bitnami_moodle
    - ALLOW_EMPTY_PASSWORD=yes
  ports:
    - '80:80'
    - '443:443'
  volumes: 
    - /Users/macbook/Code/Php/moodle-docker/moodle:/bitnami/gatto
    - moodle_data:/bitnami
  depends_on:
    - mariadb

Remember: Your folder on host_folder must be acessible by docker daemon