Docker Volume contents not copied to Container

Question

I have a local volume created in docker

when i run the following command the content inside volumes as successfully copied to the docker container

docker run -d \
  --name devtest \
  --mount source=mydata,target=/var/www/admin/public \
   local:5000/api-live/php-fpm:2021-04-22-07.19.24

However when i try to do the same in docker-compose the contents dont get copied just the Destination folder is created

services:

  fpm:
    image: local:5000/api-live/php-fpm:2021-04-22-07.19.24
    ports:
      - "9090:9000"
     volumes:
       - ./mydata:/var/www/admin/public
    restart: always

Thanks in advance for helping

Answer 1

When the volume has been already created, which is deduced through the first docker command with bind --mount switch , you have to specify such a state to docker compose in order for the latter to not create a new volume named after your project name ( [project_name]_mydata .

This can be achieved using the external: true volume property:

services:
  fpm:
    image: local:5000/api-live/php-fpm:2021-04-22-07.19.24
    ports:
      - "9090:9000"
     volumes:
       - mydata:/var/www/admin/public
    restart: always
  volumes:
    mydata:
      external: true