LXD (localhost) does not officially support attaching loopback devices for storage out of the box. However, with some configuration you can make this work.

Each container uses the 'default' LXD profile, but also uses a model-specific profile with the name`juju-<model-name>`. Editing a profile will affect all of the containers using it, so you can add loop devices to all LXD containers by editing the 'default' profile, or you can scope it to a model.

Each container uses the 'default' LXD profile, but also uses a model-specific profile with the name`juju-<model-name>-<model-short-UUID>` where`<model-short-UUID>` is the first 6 characters of the model UUID. Editing a profile will affect all of the containers using it, so you can add loop devices to all LXD containers by editing the 'default' profile, or you can scope it to a model.

To add loop devices to your container, add entries to the 'default', or model-specific, profile, with`lxc profile edit <profile>`: