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How do I ensure docker containers can access host volume data after a restart?

I have several Docker containers suffering from the same problem: after they’re restarted or re-created, they lose access to some files in their host mounted volumes. The files are still visible within the container volume (typically /config ) but are not recognized by the hosted application.

This seems to happen because within the container the files are created as root:root. In my host environment I do not have docker running as root - rather it runs as uid=997(docker).

I can restore their access to those files by issuing a $ sudo chown -R :docker * command from my host environment and restarting the container.

In the host environment (ubuntu 20.04.1 LTS) the volumes live within my user directory /home/USER/docker where my user is added to the docker group sudo usermod -aG docker ${USER}

The specific containers I am using that have this issue are:

  • pihole/pihole:latest
  • homeassistant/home-assistant:stable
  • plexinc/pms-docker
  • duplicati/duplicati
  • esphome/esphome

How should I change my configuration to allow docker containers to access files they’ve created themselves within their volumes?