Permission denied error with letsencrypt even the permission is set to 600

Version: Traefik:v2.1

I'm getting permission denied error for acme.json file even when the permission is set to 600.

level=error msg="The ACME resolver \"myresolver\" is skipped from the resolvers list because: unable to get ACME account: open /acme.json: permission denied"

Snippet of docker file

    command:
      - --certificatesresolvers.myresolver.acme.storage=etc/traefik/acme/acme.json
    volumes:
      - ./proxy-config.toml:/etc/traefik/proxy-config.toml:ro
      - ./letsencrypt/:/etc/traefik/acme/

file permission on machine is:

ls -lh letsencrypt/acme.json
-rw------- 1 prayag prayag 0 Feb 20 12:45 letsencrypt/acme.json

file permisison and user inside traefik container

/ # ls -lh acme.json
-rw-------    1 nobody   nobody         0 Feb 20 12:45 acme.json

file permission for proxy-config.yaml
on machine

ls -lh proxy-config.toml
-rw-rw-r-- 1 prayag prayag 1.2K Feb 20 18:22 proxy-config.toml

Inside container

/ # ls -lh /etc/traefik/proxy-config.toml
-rw-rw-r--    1 nobody   nobody      1.1K Feb 20 18:22 /etc/traefik/proxy-config.toml

what I' not able to understand is that the proxy-config.yaml has same uid:gid as of acme.json file but acme.json giving permisison error while proxy-xonfig.yaml is workign fine.

solved it. Using named volumes instead of bind mounts fixed this issue.