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Setting up Samba share in docker. What is purpose of mounting a volume vs -s?

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Set up a dperson/samba container in docker on Ubuntu server. In order to set up a share I used the following command in the compose file: command: '-p -u "user1;badpass" -s "etl_share;/mount/etl_share;no;no;no;user1"' which mounts a share called etl_share that is located at /mnt/etl_share on the host. This works fine. But I also see in some docs that they use -v to mount a volume. Why do that in addition to -s?

Docker run from Docs:

sudo docker run -it -p 139:139 -p 445:445 -d dperson/samba -p \
-u "example1;badpass" \
-u "example2;badpass" \
-s "public;/share" \
-s "users;/srv;no;no;no;example1,example2" \
-s "example1 private share;/example1;no;no;no;example1" \
-s "example2 private share;/example2;no;no;no;example2"

Docker-compose from docs: 

services:
  samba:
    image: dperson/samba
    environment:
      TZ: 'EST5EDT'
    networks:
      - default
    ports:
      - "137:137/udp"
      - "138:138/udp"
      - "139:139/tcp"
      - "445:445/tcp"
    read_only: true
    tmpfs:
      - /tmp
    restart: unless-stopped
    stdin_open: true
    tty: true
    volumes:
      - /mnt:/mnt:z
      - /mnt2:/mnt2:z
    command: '-s "Mount;/mnt" -s "Bobs Volume;/mnt2;yes;no;no;bob" -u "bob;bobspasswd" -p'
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• • Edited

-v is first used to mount the volume in the container
-s is used later, 'command:' runs the command at container launch, inside of the container. -s tells samba to share the directory

if you only have -v, then you have the directory available in the container, but you didn't tell samba to do anything with it, so it won't show up in samba

if you have only -s, then the container can't see the directory mounted in -v. You would probably get an error like "directory not found"

• • Edited

The thing is, I am not using -v, only -s and i can see the directory just fine, which is why I am confused.

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