Accessing Bluetooth dongle from inside Docker?

Try this:

sudo docker run --net=host --privileged -i -t ubuntu /bin/bash

linux docker bluetooth

If you want to run bluez from a docker (and not only expose hci adapter) you need:

To start your docker with sudo docker run --privileged -i -t your_image_name /bin/bash
Make sure bluez is not running on your host. In my case I add to kill bluez (killall -9 bluetoothd) (and not stopped it properly as it will power down my bluetooth adapter and will not exposed it into the docker)
In your docker entrypoint, you will need to start dbus (/etc/init.d/dbus start) and bluez (/usr/libexec/bluetooth/bluetoothd --debug &)

linux docker bluetooth

I can confirm that what OlivierM wrote is working on me. Spent some time on Raspberry Pi 3B+ and its built-in bluetooth.

Dockerfile:

FROM python:3.7RUN apt-get updateRUN apt-get install -y bluez bluetoothENTRYPOINT sh docker_entrypoint.sh

and entrypoint:

#!/bin/bashservice dbus startbluetoothd &/bin/bash

sudo killall -9 bluetoothd is needed on host machine before before starting the container:

docker run --rm --net=host --privileged -it myimage:mytag

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