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Why all docker compose files use the managed docker volumes instead of directly mounting a custom directory? (lemmy.pe1uca.dev)

submitted 1 year ago by pe1uca@lemmy.pe1uca.dev to c/selfhosted@lemmy.world

15 comments fedilink hide all child comments

All docker files look something like this

services:
  service_name:
    image: author/project:latest
    container_name: service_name
    volumes:
      - service_data:/app/data/

volumes:
  service_data:

Yes, this makes the data to persist, but it creates a directory with a random name inside /var/lib/docker/volumes/
This makes it really hard to actually have ownership of the data of the service (for example to create backups, or to migrate to another host)

Why is it standard practice to use this instead of having a directory mounted inside at the same level you have your docker-compose.yml?
Like this - ./service_data:/app/data

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[–] AbouBenAdhem@lemmy.world 4 points 1 year ago (1 children)

I assume it’s because it reduces the possibility of other processes outside of the linked containers accessing the files (so security and stability).

[–] enemenemu@lemm.ee 5 points 1 year ago

Why would it reduce it?

If you want to secure it, use selinux and add :Z which truly eliminates the possibility